Ferroelectricity generated by spin–orbit and spin–lattice couplings in multiferroic DyMnO3
Ferroelectricity generated by spin–orbit and spin–lattice couplings in multiferroic DyMnO3
Na Zhang1,2, Shuai Dong3, Jun-Ming Liu1,4,5()
1. Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China; 2. Department of Physics, Henan Normal University, Xinxiang 453007, China; 3. Department of Physics, Southeast University, Nanjing 211189, China; 4. Institute for Advanced Materials, South China Normal University, Guangzhou 510631, China; 5. International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China
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.
Corresponding Author(s):
Liu Jun-Ming,Email:liujm@nju.edu.cn
引用本文:
. Ferroelectricity generated by spin–orbit and spin–lattice couplings in multiferroic DyMnO3[J]. Frontiers of Physics, 2012, 7(4): 408-417.
Na Zhang, Shuai Dong, Jun-Ming Liu. Ferroelectricity generated by spin–orbit and spin–lattice couplings in multiferroic DyMnO3. Front. Phys. , 2012, 7(4): 408-417.
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