Ferroelectricity a Revolutionary Century of Discovery

Total Page:16

File Type:pdf, Size:1020Kb

Ferroelectricity a Revolutionary Century of Discovery AMERICAN CERAMIC SOCIETY bullemerginge ceramicstin & glass technology JANUARY/FEBRUARY 2020 Ferroelectricity A revolutionary century of discovery Ceramics Expo 2020 preview | NSF CAREER program–10 years strong | Meet ACerS president When it Comes to Heat, We Sweat the Details! Your firing needs are unique. Our laboratory can run tests to So why use an “off the shelf” help identify your process kiln in your process? boundaries. Through our toll firing facility, we can At Harrop, we get it. help to further define That’s why, for nearly the equipment/ a century, we’ve been processing putting in the hard work combination that to design and service works best for your custom kilns. Is it harder material. And if you to do things this way? are not ready for a Yes. Is the extra effort new kiln, we can toll worth it? You bet! fire your material to help meet your At Harrop, we don’t production needs. stop there. If you aren’t sure what you Does your current need, we can help. kiln company sweat the details? www.harropusa.com 1.614.231.3621 Harrop Ad Sweat the Details ACerS Full Size w 100 logo.indd 1 10/31/19 10:05 AM contents January/February 2020 • Vol. 99 No.1 department News & Trends . 3 feature articles Spotlight . 10 Ceramics in the Environment ...16 Impact of ferroelectricity Research Briefs ..............17 22 Since the discovery of ferroelectricity 100 years ago, ferroelectric materials are everywhere in our electronics- Advances in Nanomaterials ...19 based society. Learn how they drive a $7 billion industry. Ceramics in Manufacturing ... 20 by Susan Trolier-McKinstry columns Meet ACerS president Tatsuki Ohji . 8 by Eileen De Guire Highlights from ACerS 121st Annual Business Meeting . 9 Ferroelectricity—A revolutionary century 24 of discovery by Lisa McDonald A century after the discovery of ferroelectricity, we look Business and Market View . 7 at the physics that makes ferroelectric materials so useful Lead-free piezoelectric ceramics market and the research that got us here. projected to grow at much faster pace through 2024 by Geoff Brennecka, Rachel Sherbondy, by Margareth Gagliardi Robert Schwartz, and Jon Ihlefeld cover story Deciphering the Discipline . .. 48 Ferroelectric nitrides for communications technologies by Daniel Drury National Science Foundation CAREER meetings 31 Ceramics Program awardees: Class of 2018 and decadal overview Glass and Optical Materials Division Annual Meeting As an independent federal agency of the United States government, the National Science Foundation (NSF) (GOMD 2020) . .. 37 funds basic research conducted at America’s colleges and 6th Ceramics Expo preview . 38 universities. NSF’s Ceramics Program in the Division of Materials Research resides within the Mathematical and Electronic Materials and Physical Sciences Directorate. Applications (EMA 2020) . 40 by Lynnette D. Madsen 44th International Conference and Exposition on Advanced Ceramics and Composites . 42 resources Calendar . 44 Classified Advertising . 45 Display Ad Index . 47 American Ceramic Society Bulletin, Vol. 99, No. 1 | www.ceramics.org 1 AMERICAN CERAMIC SOCIETY bulletin online Editorial and Production www.ceramics.org Eileen De Guire, Editor [email protected] Lisa McDonald, Associate Editor January/February 2020 • Vol. 99 No.1 Michelle Martin, Production Editor Tess Speakman, Senior Graphic Designer Editorial Advisory Board Darryl Butt, University of Utah Fei Chen, Wuhan University of Technology, China http://bit.ly/acerstwitter http://bit.ly/acerslink http://bit.ly/acersgplus http://bit.ly/acersfb http://bit.ly/acersrss Michael Cinibulk, Air Force Research Laboratory Kang Lee, NASA Glenn Research Center Eliana Muccillo, IPEN-SP, Brazil Oomman Varghese, University of Houston As seen on Ceramic Tech Today... Customer Service/Circulation Government, industry, academia ph: 866-721-3322 fx: 240-396-5637 [email protected] investigate additively manufacturing Advertising Sales cemented carbide parts National Sales Mona Thiel, National Sales Director Additive manufacturing may be an easier way to manu- [email protected] facture cemented carbide parts. The U.S. Army Research ph: 614-794-5834 fx: 614-794-5822 Laboratory recently submitted a patent application for a selective laser melting process, and collaborations in indus- Europe Richard Rozelaar Credit: ExOne try and academia are investigating binder jetting as well. [email protected] ph: 44-(0)-20-7834-7676 fx: 44-(0)-20-7973-0076 Executive Staff Mark Mecklenborg, Executive Director and Publisher [email protected] Read more at www.ceramics.org/carbideparts Eileen De Guire, Director of Technical Publications and Communications [email protected] Marcus Fish, Development Director Also see our ACerS journals... Ceramic and Glass Industry Foundation Direct and indirect measurement of large electrocaloric effect in [email protected] barium strontium titanate ceramics Michael Johnson, Director of Finance and Operations By G . Dai, S . Wang, G . Huang, et al . [email protected] Mark Kibble, Director of Information Technology International Journal of Applied Ceramic Technology [email protected] Sue LaBute, Human Resources Manager & Exec . Assistant Processing and properties of Bi0.98R0.02FeO3 (R = La, Sm, Y) [email protected] ceramics flash sintered at~ 650°C in <5 s Andrea Ross, Director of Meetings and Marketing By E . Gil-González, A . Perejón, P . E . Sánchez-Jiménez, et al . [email protected] Journal of the American Ceramic Society Kevin Thompson, Director of Membership [email protected] Poling tuning: A plausible solution for minimizing microphony Officers and secondary pyroelectric coefficient in ferroelectrics Tatsuki Ohji, President Dana Goski, President-Elect By R . Kiran, A . Kumar, R . Kumar, and R . Vaisht Sylvia Johnson, Past President International Journal of Applied Ceramic Technology Stephen Houseman, Treasurer Mark Mecklenborg, Secretary Dielectric and structural studies of ferroelectric phase evolution in dipole-pair substituted barium titanate ceramics Board of Directors Mario Affatigato, Director 2018–2021 By V . K . Veerapandiyan, M . Deluca, S . T . Misture, et al . Helen Chan, Director 2019-2022 Journal of the American Ceramic Society Monica Ferraris, Director 2019-2022 Kevin Fox, Director 2017-2020 William Headrick, Director 2019-2022 John Kieffer, Director 2018-2021 Sanjay Mathur, Director 2017-2020 Martha Mecartney, Director 2017-2020 Jingyang Wang, Director 2018–2021 Read more at www.ceramics.org/journals Stephen Freiman, Parliamentarian American Ceramic Society Bulletin covers news and activities of the Society and its members, includes items of interest to the ceramics community, and provides the most current information concerning all aspects of ceramic technology, including R&D, manufacturing, engineering, and marketing . The American Ceramic Society is not responsible for the accuracy of information in the editorial, articles, and advertising sections of this publication . Readers should independently evaluate the accuracy of any statement in the editorial, articles, and advertising sections of this publication . American Ceramic Society Bulletin (ISSN No . 0002-7812) . ©2020 . Printed in the United States of America . ACerS Bulletin is published monthly, except for February, July, and November, as a “dual-media” magazine in print and electronic formats (www .ceramics .org) . Editorial and Subscription Offices: 550 Polaris Parkway, Suite 510, Westerville, OH 43082-7045 . Subscription included with The American Ceramic Society membership . Nonmember print subscription rates, including online access: United States and Canada, 1 year $135; international, 1 year $150 .* Rates include shipping charges . International Remail Service is standard outside of the United States and Canada . *International nonmembers also may elect to receive an electronic-only, email delivery subscription for $100 . Single issues, January–October/November: member $6 per issue; nonmember $15 per issue . December issue (ceramicSOURCE): member $20, nonmember $40 . Postage/handling for single issues: United States and Canada, $3 per item; United States and Canada Expedited (UPS 2nd day air), $8 per item; International Standard, $6 per item . POSTMASTER: Please send address changes to American Ceramic Society Bulletin, 550 Polaris Parkway, Suite 510, Westerville, OH 43082-7045 . Periodical postage paid at Westerville, Ohio, and additional mailing offices . Allow six weeks for address changes . ACSBA7, Vol . 99, No . 1, pp 1– 48 . All feature articles are covered in Current Contents . 2 www.ceramics.org | American Ceramic Society Bulletin, Vol. 99, No. 1 news & trends Labor shortage challenges so that’s a challenge,” says Garth Tayler, Those challenges extend beyond brick manufacturing and construc- retired technical director for Acme Brick as well, as many other product segments (Fort Worth, Texas). face similar challenges. tion industries A theme that consistently echoes across diverse markets tied to the con- struction industry is a familiar concern—labor. “The generation that is coming into the workforce is less likely to enter the construction market, so there is a gap in labor that is there for all trades—electri- cal, roofing, insulation, all of it. It’s an issue the entire building industry is try- ing to address,” says Matt Gawryla, insu- lation R&D leader at Owens Corning. In addition to attracting new young workers, other contributing factors to these labor shortages include the aging current workforce as well as
Recommended publications
  • Surface Plasmons and Gain Media
    Chapter 5 Surface plasmons and gain media by M.A. Noginov, G. Zhu Center for Materials Research, Norfolk State University, Norfolk, VA, 23504 V.P. Drachev, V.M. Shalaev School of Electrical & Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907 Nanophotonics with Surface Plasmons V.M. Shalaev & S. Kawata (Editors) Advances in Nano-Optics and Nano-Photonics r 2007 Published by Elsevier B.V. ISSN: 1871-0018 DOI: 10.1016/S1871-0018(06)02005-X 141 Contents Page y 1. Introduction . ...................................143 y 2. Estimation of the critical gain ........................148 y 3. Experimental samples and setups . ....................149 y 4. Experimental results and discussion....................149 y 5. Summary . ...................................164 Acknowledgments ................................... 165 References . ....................................... 165 142 § 1. Introduction The technique of coloring stain glasses by gold and silver nanoparticles was known to Romans. The British Museum has a famous Lycurgus Cup (4th Century A.D.), which changes its color depending on the illumination (fig. 1). When viewed in reflected light, for example, in daylight, it appears green. However, when a light is shone into the cup and transmitted through the glass, it appears red. Nowadays it is known that the colora- tion of the Cup is determined by the frequency of localized surface plasmon (SP) resonance in metallic nanoparticles embedded into the glass. Localized SP is the oscillation of free electrons in a metallic particle (driven by an external electromagnetic wave), whose resonance frequency is the plasma frequency adjusted by the size and, mainly, the shape of the particle. A phenomenon relevant to localized SPs is a surface plasmon polariton (SPP) or a surface electromagnetic wave propagating along the interface between two media possessing permittivities with opposite signs, such as metal–dielectric interface.
    [Show full text]
  • Electronic Ferroelectricity in Carbon Based Materials
    Electronic ferroelectricity in carbon based materials Natasha Kirova1,3* and Serguei Brazovskii2,3 1LPS, CNRS, Univ Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France 2LPTMS, CNRS, Univ Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France 3Moscow Institute for Steel and Alloys, Leninskii av. 4, 119049 Moscow, Russia. We review existing manifestations and prospects for ferroelectricity in electronically and optically active carbon-based materials. The focus point is the proposal for the electronic ferroelectricity in conjugated polymers from the family of substituted polyacetylenes. The attractive feature of synthetic organic ferroelectrics is a very high polarizability coming from redistribution of the electronic density, rather than from conventional displacements of ions. Next fortunate peculiarity is the symmetry determined predictable design of perspective materials. The macroscopic electric polarization follows ultimately from combination of two types of a microscopic symmetry breaking which are ubiquitous to qusi-1D electronic systems. The state supports anomalous quasi-particles - microscopic solitons, carrying non-integer electric charges, which here play the role of nano-scale nucleus of ferroelectric domain walls. Their spectroscopic features in optics can interfere with low-frequency ferroelectric repolarization providing new accesses and applications. In addition to already existing electronic ferroelectricity in organic crystals and donor-acceptor chains, we point to a class of conducting polymers and may be also to nano-ribbons of the graphene where such a state can be found. These proposals may lead to potential applications in modern intensive searches of carbon ferroelectrics. Keywords: ferroelectricity, organic conductor, conjugated polymers, polyacetylene, graphene, soliton, non- integer charge, domain wall 1. Introduction Ferroelectricity is a phenomenon of spontaneous controllable electric polarizations in some, usually crystalline, solids [1].
    [Show full text]
  • Electroceramics: Characterization by Impedance Spectroscopy
    ADVANCED MATERIALS Ferroelectric Ceramics Electroceramics : Grain Boundary Capacitances Ceramic Electrolytes Characterization by Surface Layers on Glasses Impedance Spectroscopy Ferromagnetic Ceramics By John T. S. Irvine,* Derek C. Sinclair,* and Anthony R. West * Electroceramics are advanced materials whose properties In order to characterize the microstructures and properties and applicationsdepend on the close control of structure, com- of electroceramics, techniques are required that can probe or position, ceramic texture, dopants and dopant (or defect) dis- distinguish between the different regions of a ceramic. Elec- tribution. Impedance spectroscopy is a powerful technique for tron microscopy with an analytical facility is, of course, the unravelling the complexities of such materials, which functions most direct method fo r both microstructural characteriza- by utilizing the different frequency dependences of the constit- tion and for determining compositional variations within a uent components for their separation. Thus, electrical inhomo- solid. Corresponding measurements of microscopic electri- geneities in ceramic electrolytes, electrode/electrolyte inter- cal properties are possible in principle, as shown by the ele- faces, surface layers on glasses, ferroelectricity, positive gant work of Dimos et al. on the effect of grain orientation temperature coefficient of resistance behavior and even ferri- mismatch on critical current densities in ceramic supercon- magnetism can all be probed, successfully, using this tech- ductor~.[~]Such
    [Show full text]
  • Ferroelectricity and Piezoelectricity Batio3
    Ferroelectricity and Piezoelectricity BaTiO3 cubic (contains i = > no spontaneous P) Can be used to make nonvolatile memory BaTiO3 r 1 Can be used to make ultracapacitors Paraelectric state Above Tc, BaTiO3 is paraelectric. The susceptibility (and dielectric constant) diverge like a Curie-Weiss law. 1 1 0 TT c This causes a big peak in the dielectric constant at Tc. Ferroelectric Paraelectric PbTiO3 Dielectric constant 1 TT c Pyroelectric constant Polarization Specific heat Antiferroelectricity PbZrO3 Polarization aligns antiparallel. Associated with a structural phase transition. Large susceptibility and dielectric constant near the transition. Phase transition is observed in the specific heat, x-ray diffraction. Applied field T > Tc T < Tc T < Tc Piezoelectricity Many piezoelectric materials are ferroelectric. Electric field couples to polarization, polarization couples to structure. lead zirconate titanate (Pb[ZrxTi1−x]O3 0<x<1) —more commonly known as PZT barium titanate (BaTiO3) Tc = 408 K lead titanate (PbTiO3) Tc = 765 K potassium niobate (KNbO3) Tc = 708 K lithium niobate (LiNbO3) Tc = 1480 K lithium tantalate (LiTaO3) Tc = 938 K quartz (SiO2), GaAs, GaN Gallium Orthophosphate (GaPO4) Tc = 970 K Third rank tensor, No inversion symmetry Piezoelectric crystal classes: 1, 2, m, 222, mm2, 4, -4, 422, 4mm, -42m, 3, 32, 3m, 6, -6, 622, 6mm, -62m, 23, -43m Piezoelectricity When you apply a voltage across certain crystals, they get longer. AFM's, STM's Quartz crystal oscillators Surface acoustic wave generators Pressure sensors - Epcos Fuel injectors - Bosch Inkjet printers PZT (Pb[ZrxTi1−x]O3 0<x<1) Antiferroelectric Large piezoelectric response near the rhombohedral-tetragonal transition. Electric field induces a structural phase transition.
    [Show full text]
  • Piezoelectric Crystal Experiments for High School Science and En- Gineering Students
    Paper ID #14540 MAKER: Piezoelectric Crystal Experiments for High School Science and En- gineering Students Mr. William H. Heeter, Porter High School Engineering Dept. My name is William (Bill) Heeter. I graduated from Texas A&M with an Engineering degree in 1973. I worked in Industrial Distribution for over 30 years before becoming a high school pre-engineering teacher. I have been teaching engineering and technology for the past 13 years. I have been a Master Teacher for ”Project Lead the Way”, CTE co-Director, CTE Building Chair, Technology Teacher. My students have received many awards and college scholarships. One group of students received a provisional U.S. Patent. Several students have seen their work actually produced by industry, including the ordering touch screens used by Bucky’s. Dr. Sheng-Jen ”Tony” Hsieh, Texas A&M University Dr. Sheng-Jen (”Tony”) Hsieh is a Professor in the Dwight Look College of Engineering at Texas A&M University. He holds a joint appointment with the Department of Engineering Technology and the De- partment of Mechanical Engineering. His research interests include engineering education, cognitive task analysis, automation, robotics and control, intelligent manufacturing system design, and micro/nano manufacturing. He is also the Director of the Rockwell Automation laboratory at Texas A&M University, a state-of-the-art facility for education and research in the areas of automation, control, and automated system integration. Dr. Jun Zou, Department of Electrical and Computer Engineering, Texas A&M University Jun Zou received his Ph.D. degree in electrical engineering from the University of Illinois at Urbana- Champaign in 2002.
    [Show full text]
  • Coupled Electricity and Magnetism: Multiferroics and Beyond
    Coupled electricity and magnetism: multiferroics and beyond Daniel Khomskii Cologne University, Germany JMMM 306, 1 (2006) Physics (Trends) 2, 20 (2009) Degrees of freedom charge Charge ordering Ferroelectricity Qαβ ρ(r) (monopole) P or D (dipole) (quadrupole) Spin Orbital ordering Magnetic ordering Lattice Maxwell's equations Magnetoelectric effect In Cr2O3 inversion is broken --- it is linear magnetoelectric In Fe2O3 – inversion is not broken, it is not ME (but it has weak ferromagnetism) Magnetoelectric coefficient αij can have both symmetric and antisymmetric parts Pi = αij Hi ; Symmetric: Then along main axes P║H , M║E For antisymmetric tensor αij one can introduce a dual vector T is the toroidal moment (both P and T-odd). Then P ┴ H, M ┴ E, P = [T x H], M = - [T x E] For localized spins For example, toroidal moment exists in magnetic vortex Coupling of electric polarization to magnetism Time reversal symmetry P → +P t → −t M → −M Inversion symmetry E ∝ αHE P → −P r → −r M → +M MULTIFERROICS Materials combining ferroelectricity, (ferro)magnetism and (ferro)elasticity If successful – a lot of possible applications (e.g. electrically controlling magnetic memory, etc) Field active in 60-th – 70-th, mostly in the Soviet Union Revival of the interest starting from ~2000 • Perovskites: either – or; why? • The ways out: Type-I multiferroics: Independent FE and magnetic subsystems 1) “Mixed” systems 2) Lone pairs 3) “Geometric” FE 4) FE due to charge ordering Type-II multiferroics:FE due to magnetic ordering 1) Magnetic spirals (spin-orbit interaction) 2) Exchange striction mechanism 3) Electronic mechanism Two general sets of problems: Phenomenological treatment of coupling of M and P; symmetry requirements, etc.
    [Show full text]
  • Electrical Characterisation of Ferroelectric Field Effect Transistors Based On
    Technische Universität Dresden Electrical Characterisation of Ferroelectric Field Effect Transistors based on Ferroelectric HfO2 Thin Films Dipl.-Ing. Ekaterina Yurchuk von der Fakultät Elektrotechnik und Informationstechnik der Technischen Universität Dresden zur Erlangung des akademischen Grades Doktoringenieur (Dr.-Ing.) genehmigte Dissertation Vorsitzender: Prof. Dr.-Ing. habil. R. Schüffny Gutachter: Prof. Dr.-Ing. T. Mikolajick Tag der Einreichung: 23.07.2014 Prof. Dr. K. Dörr Tag der Verteidigung: 06.02.2015 Abstract The ferroelectric field effect transistors (FeFETs) are considered as promising candidates for future non-volatile memory applications due to their attractive features, such as non-volatile data storage, program/erase times in the range of nanoseconds, low operation voltages, almost unlimited endurance, non-destructive read-out and a compact one-transistor cell structure without any additional access device needed. Despite the efforts of many research groups an industrial implementation of the FeFET concept is still missing. The main obstacles originate from the conventional perovskite ferroelectric materials (lead zirconium titanate (PZT) and strontium bismuth tantalate (SBT)), in particular their integration and scaling issues. The recently discovered ferroelectric behaviour of HfO2-based dielectrics yields the potential to overcome these limitations. The decisive advantages of these materials are their full compatibility with the standard CMOS process and improved scaling potential. Utilisation of the Si:HfO2 ferroelectric thin films allows to fabricate FeFETs in a state-of-the- art CMOS technology node of 28 nm. The ferroelectricity in HfO2 has been discovered only several years ago. Therefore, there are still a lot of uncertainties about the origin of the ferroelectric behaviour as well as the impact of different fabrication conditions on its emergence.
    [Show full text]
  • Impact of Ferroelectricity
    erroelectric materials are ubiq- Fuitous in electrical and elec- tromechanical components and systems. Ferroelectricity is associated with large dielectric and piezoelectric coefficients, particularly when the composition is adjusted to position the solid near a phase boundary. This characteristic allows high volumetric efficiency dielec- tric charge storage, as well as high dis- placement actuators at modest voltages. The ability to reorient the spontaneous polarization between crystallographically- defined states is essential in allowing poling of ceramic materials to obtain net Impact of piezoelectric or pyroelectric responses. Capacitors The largest industrial use of ferroelectric materials is in ferroelectricity multilayer ceramic capacitors. The poor availability of mica- based crystals during World War II spurred development of By Susan Trolier-McKinstry air- and moisture-stable, high volumetric efficiency dielec- trics. The subsequent dawn of the electronics age led to pro- duction of several trillion BaTiO3-based capacitors around Since the discovery of ferroelectricity 100 years ago, the world on an annual basis, with hundreds to thousands used in each current generation smart phone or computer. ferroelectric materials are everywhere in our electronics-based The size of this market is approximately $6 billion. Among society. Learn how they drive a $7 billion industry. the major capacitor suppliers around the world are Murata, Taiyo Yuden, Samsung Electromechanics, Kyocera (AVX), TDK, Yageo, and Kemet. Medical ultrasound is the second most widely adopted imaging modality in medicine. It works thanks to ferroelectric materials. 22 www.ceramics.org | American Ceramic Society Bulletin, Vol. 99, No. 1 The relatively closely-spaced ferroelectric phase transitions in BaTiO3 enable a high relative permittivity over a broad Before temperature range.
    [Show full text]
  • Evidence for Ferroelectricity in Iv-Vi Compounds G
    EVIDENCE FOR FERROELECTRICITY IN IV-VI COMPOUNDS G. Pawley To cite this version: G. Pawley. EVIDENCE FOR FERROELECTRICITY IN IV-VI COMPOUNDS. Journal de Physique Colloques, 1968, 29 (C4), pp.C4-145-C4-150. 10.1051/jphyscol:1968423. jpa-00213627 HAL Id: jpa-00213627 https://hal.archives-ouvertes.fr/jpa-00213627 Submitted on 1 Jan 1968 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. JOURNAL DE PHYSIQUE Colloque C 4, supplkment au no 11-12, Tome 29, Novembre-Dkcembre 1968, page C 4 - 145 EVIDENCE FOR FERROELECTRICITY IN IV-VI COMPOUNDS Department of Natural Philosophy - The University, Edinburgh, Scotland Rbum6. - Parce que les mkthodes habituelles servant h ktablir le caractkre ferroklectrique des cristaux ne sont pas applicables au cas de corps de haute conductivitk, on doit alors introduire d'autres moyens basks sur d'autres propriktks ferroklectriques. L'analyse de la structure cristalline peut fournir un modile montrant la possibilitk de polarisation reversible, mais une preuve plus convaincante peut venir de l'ktude de la dynamique du cristal. La diffusion inklastique cohbente des neutrons donne les frkquences des modes normaux du cristal et la variation en tempkrature de certains modes peut indiquer la ferroklectricite ou I'antiferrokkctricite.
    [Show full text]
  • Analogies and Differences Between Ferroelectrics and Ferromagnets
    Analogies and Differences between Ferroelectrics and Ferromagnets Nicola A. Spaldin Materials Department, University of California, Santa Barbara, CA 93106-5050, USA [email protected] ferro Fer"ro A prefix, or combining form, indicating ferrous iron as an ingredient; as, ferrocyanide. [From Latin ferrum, iron.] Source: Webster’s Revised Unabridged Dictionary, (c) 1996, 1998 MICRA, Inc. Abstract. We describe the similarities and differences between ferromagnets – materials that have a spontaneous magnetization that is switchable by an applied magnetic field – and ferroelectrics, which have an analogous electric-field switch- able electric polarization. After comparing the driving force for ion off-centering that causes the polarization in ferroelectrics with the physics of spin polariza- tion that causes the magnetization of ferromagnets, we analyze the mechanisms of domain formation and resulting domain structures in both material classes. We describe the emerging technologies of ferroelectric and magnetoresistive random access memories, and discuss the behavior of magnetoelecric multiferroics, which combine ferromagnetism and ferroelectricity in the same phase. The “ferro” part in the name “ferroelectric” is something of a misnomer, since it does not refer to the presence of iron in ferroelectric materials. Rather it arises from the many similarities in behavior between ferroelectrics, with their spontaneous electric polarization, and ferromagnets, with their sponta- neous magnetization. Indeed one of the earliest observations of ferroelectric- ity ([1]) describes the electric hysteresis in Rochelle salt as “analogous to the magnetic hysteresis in the case of iron.” A systematic comparison between the behavior of ferromagnets and ferroelectrics, does not, to our knowledge, exist in the literature. The purpose of this chapter is to outline the sim- ilarities in behavior between ferromagnets and ferroelectrics, and, perhaps more importantly, to point out the differences in their fundamental physics and consequent applications.
    [Show full text]
  • Quantum Ferroelectricity in Charge-Transfer Complex Crystals
    ARTICLE Received 13 Jan 2015 | Accepted 12 May 2015 | Published 16 Jun 2015 DOI: 10.1038/ncomms8469 OPEN Quantum ferroelectricity in charge-transfer complex crystals Sachio Horiuchi1,2, Kensuke Kobayashi3, Reiji Kumai2,3, Nao Minami4, Fumitaka Kagawa2,5 & Yoshinori Tokura4,5 Quantum phase transition achieved by fine tuning the continuous phase transition down to zero kelvin is a challenge for solid state science. Critical phenomena distinct from the effects of thermal fluctuations can materialize when the electronic, structural or magnetic long-range order is perturbed by quantum fluctuations between degenerate ground states. Here we have developed chemically pure tetrahalo-p-benzoquinones of n iodine and 4–n bromine sub- stituents (QBr4–nIn, n ¼ 0–4) to search for ferroelectric charge-transfer complexes with tet- rathiafulvalene (TTF). Among them, TTF–QBr2I2 exhibits a ferroelectric neutral–ionic phase transition, which is continuously controlled over a wide temperature range from near-zero kelvin to room temperature under hydrostatic pressure. Quantum critical behaviour is accompanied by a much larger permittivity than those of other neutral–ionic transition compounds, such as well-known ferroelectric complex of TTF–QCl4 and quantum antiferro- electric of dimethyl–TTF–QBr4. By contrast, TTF–QBr3I complex, another member of this compound family, shows complete suppression of the ferroelectric spin-Peierls-type phase transition. 1 National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan. 2 CREST, Japan Science and Technology Agency (JST), Tokyo 102-0076, Japan. 3 Condensed Matter Research Center (CMRC) and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan.
    [Show full text]
  • Arxiv:2003.13695V3 [Cond-Mat.Mes-Hall] 15 Sep 2020
    Quantum Electrodynamic Control of Matter: Cavity-Enhanced Ferroelectric Phase Transition Yuto Ashida∗ Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan Atac¸ I_mamo˘glu and Jer´ omeˆ Faist Institute of Quantum Electronics, ETH Zurich, CH-8093 Zurich,¨ Switzerland Dieter Jaksch Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom Andrea Cavalleri Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany and Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom Eugene Demler Department of Physics, Harvard University, Cambridge, MA 02138, USA The light-matter interaction can be utilized to qualitatively alter physical properties of materials. Recent the- oretical and experimental studies have explored this possibility of controlling matter by light based on driving many-body systems via strong classical electromagnetic radiation, leading to a time-dependent Hamiltonian for electronic or lattice degrees of freedom. To avoid inevitable heating, pump-probe setups with ultrashort laser pulses have so far been used to study transient light-induced modifications in materials. Here, we pursue yet another direction of controlling quantum matter by modifying quantum fluctuations of its electromagnetic environment. In contrast to earlier proposals on light-enhanced electron-electron interactions, we consider a dipolar quantum many-body system embedded in a cavity composed of metal mirrors, and formulate a theoret- ical framework to manipulate its equilibrium properties on the basis of quantum light-matter interaction. We analyze hybridization of different types of the fundamental excitations, including dipolar phonons, cavity pho- tons, and plasmons in metal mirrors, arising from the cavity confinement in the regime of strong light-matter interaction.
    [Show full text]