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Magnetoelectric feedback among magnetic order, polarization, and lattice in multiferroic BiFeO3

Title
Magnetoelectric feedback among magnetic order, polarization, and lattice in multiferroic BiFeO3
Authors
Park J.Lee S.-H.Lee S.Gozzo F.Kimura H.Noda Y.Choi Y.J.Kiryukhin V.Cheong S.-W.Jo Y.Choi E.S.Balicas L.Jeon G.S.Park J.-G.
Ewha Authors
전건상
SCOPUS Author ID
전건상scopus
Issue Date
2011
Journal Title
Journal of the Physical Society of Japan
ISSN
0031-9015JCR Link
Citation
vol. 80, no. 11
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
By extensive studies of both neutron and synchrotron X-ray diffraction, we discover that the structure deviates from well-known Debye-Gruneissen predictions below TN in multiferroic BiFeO3. At the same time, it exhibits a magnetoelastic effect of ∼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 ∼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 The Physical Society of Japan.
DOI
10.1143/JPSJ.80.114714
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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