Magnetoelectric Feedback among Magnetic Order, Polarization, and Lattice in Multiferroic BiFeO3

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概要

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• By extensive studies of both neutron and synchrotron X-ray diffraction, we discover that the structure deviates from well-known Debye--Gruneissen predictions below T_{\text{N}} in multiferroic BiFeO3. At the same time, it exhibits a magnetoelastic effect of {\sim}0.4%, when it undergoes a spiral magnetic order with an extremely long incommensurate period of 630 Å. We show that this additional electric polarization is proportional to the intensity of magnetic Bragg peaks. When subjected to high magnetic fields, our experiments and Monte-Carlo simulation results indicate that magnetic field of {\sim}20 T unwinds the spiral magnetic structure and quenches the magnetoelastic effect. This is then accompanied by the reduction of electric polarization of 40 nC/cm2. The experimental and theoretical results combined together suggest that antisymmetric Dzyaloshinskii--Moriya interaction play a key role in these phenomena. Our results demonstrate an intriguing positive feedback effect among magnetic order, polarization, and the lattice in BiFeO3.

• 2011-11-15

著者

• Balicas Luis

  National High Magnetec Field Laboratory Florida State University

• Lee Sang-hyun

  Department Of Chemical And Biomolecular Engineering Korea Advanced Institute Of Science And Technolo

• Cheong Sang-wook

  Rutgers Center For Emergent Materials And Department Of Physics And Astronomy Rutgers University

• Choi Eun

  National High Magnetic Field Laboratory

• NODA Yukio

  Institute of Multidisciplinary Research for Advanced Materials

• Kimura Hiroyuki

  Institute for Protein Research, Osaka University

• Lee Seongsu

  Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea

• Park Je-Geun

  Center for Strongly Correlated Materials Research and FPRD Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea

• Jeon Gun

  Department of Physics, Ehwa Womans University, Seoul 120-750, Korea

• Park Junghwan

  Center for Strongly Correlated Materials Research and FPRD Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea

• Gozzo Fabia

  Swiss Light Source, Paul Scherrer Institut, Villigen 5232, Switzerland

• Choi Young

  Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, U.S.A.

• Kiryukhin Valery

  Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, U.S.A.

• Jo Younjung

  National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-4005, U.S.A.

• Balicas Luis

  National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-4005, U.S.A.

• Choi Eun

  National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-4005, U.S.A.

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