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篇目详细内容 |
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【篇名】 |
Ferroelectricity generated by spin–orbit and spin–lattice couplings in multiferroic DyMnO3 |
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【刊名】 |
Frontiers of Physics |
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【刊名缩写】 |
Front. Phys |
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【ISSN】 |
2095-0462 |
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【EISSN】 |
2095-0470 |
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【DOI】 |
10.1007/s11467-011-0225-9 |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2012 |
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【卷期】 |
7
卷4期 |
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【页码】 |
408-417
页,共
10
页 |
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【作者】 |
Na Zhang;
Shuai Dong;
Jun-Ming Liu;
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【关键词】 |
multiferroics; spin–orbit coupling; spin–lattice coupling; coexistence |
【摘要】 |
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While the ferroelectricity in type-II multiferroic rare-earth manganites is believed to be generated by the inverse Dzyaloshinskii–Moriya (DM) interaction (spin–orbit coupling) associated with the Mn spiral spin order, recent results revealed the strong spin–lattice coupling arising from the Dy–Mn spin interaction in DyMnO3, which may also be an ingredient contributing to the ferroelectricity. In this work, we summarize our recent experiments on this issue by performing a series of rare-earth site nonmagnetic Y and magnetic Ho substitutions at Dy site for DyMnO3. It is demonstrated that the Dy–Mn spin interaction contributes to the ferroelectric polarization through the symmetric exchange striction mechanism (spin–lattice coupling). A coexistence of the spin–orbit coupling and spin–lattice coupling in one compound is confirmed. At the same time, the independent Dy antiferromagnetic spin order at low temperature can be effectively suppressed by the substitutions, beneficial to the polarization enhancement. |
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