Spiral spin structures and origin of the magnetoelectric coupling in YMn2O5

Kim, J. -H.; Lee, S. -H.; Park, S. I.; Kenzelmann, M.; Harris, A. B.; Schefer, J.; Chung, J. -H.; Majkrzak, C. F.; Takeda, M.; Wakimoto, S.; Park, S. Y.; Cheong, S-W.; Matsuda, M.; Kimura, H.; Noda, Y.; Kakurai, K.

doi:10.1103/PhysRevB.78.245115

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Spiral spin structures and origin of the magnetoelectric coupling in YMn2O5

Kim, J. -H.;
Lee, S. -H.;
Park, S. I.;
Kenzelmann, M.;
Harris, A. B.;
... Chung, J. -H.;
외 10명

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초록

By combining neutron four-circle diffraction and polarized neutron-diffraction techniques we have determined the complex spin structures of a multiferroic YMn2O5 that exhibits two ferroelectric phases at low temperatures. The obtained magnetic structure has spiral components in both the low-temperature ferroelectric phases that are magnetically commensurate and incommensurate, respectively. Among proposed microscopic theories for the magnetoelectric coupling, our results are consistent with both the spin-current mechanism and the magnetostriction mechanism. Our results also explain why the electric polarization changes at the low-temperature commensurate-to-incommensurate phase transition.

키워드

ferroelectric materials; ferroelectric transitions; ferromagnetic materials; magnetoelectric effects; magnetostriction; multiferroics; neutron diffraction; yttrium compounds; NEUTRON-DIFFRACTION; PHASE-TRANSITIONS; FERROELECTRICITY; POLARIZATION; REVERSAL

제목: Spiral spin structures and origin of the magnetoelectric coupling in YMn2O5

저자: Kim, J. -H.; Lee, S. -H.; Park, S. I.; Kenzelmann, M.; Harris, A. B.; Schefer, J.; Chung, J. -H.; Majkrzak, C. F.; Takeda, M.; Wakimoto, S.; Park, S. Y.; Cheong, S-W.; Matsuda, M.; Kimura, H.; Noda, Y.; Kakurai, K.

DOI: 10.1103/PhysRevB.78.245115

발행일: 2008-12

유형: Article

저널명: Physical Review B

권: 78

호: 24