Multiferroicity in Perovskite Manganite Superlattice |
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Authors: | Yong-Mei Tao Xue-Fan Jiang Jun-Ming Liu |
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Affiliation: | 1. Jiangsu Laboratory of Advanced Functional Materials, Department of Physics and Electronic Engineering, Changshu Institute of Technology, Changshu 215500, China;2. Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China |
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Abstract: | Multiferroic properties of short period perovskite type manganite superlattice ((R1MnO3)n/(R2MnO3)n (n=1,2,3)) are considered within the framework of classical Heisenberg model using Monte Carlo simulation. Our result revealed the interesting behaviors in Mn spins structure in superlattice. Apart from simple plane spin cycloid structure which is shown in all manganites including bulk, film, and superlattice here in low temperature, a non-coplanar spiral spin structure is exhibited in a certain temperature range when n equals 1, 2 or 3. Specific heat, spin-helicity vector, spin correlation function, spin-helicity correlation function, and spin configuration are calculated to confirm this non-coplanar spiral spin structure. These results are associated with the competition among exchange interaction, magnetic anisotropy, and Dzyaloshinskii-Moriya interaction. |
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Keywords: | manganite superlattice non-coplanar spiral spin order multiferroicity |
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