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arXiv · 1407.0723

Induced magnetization in La$_{0.7}$Sr$_{0.3}$MnO$_3$/BiFeO$_3$ superlattices

S. Singh·J. T. Haraldsen·J. Xiong·E. M. Choi·P. Lu·D. Yi·X. -D. Wen·J. Liu·H. Wang·Z. Bi·P. Yu·M. R. Fitzsimmons·J. L. MacManus-Driscoll·R. Ramesh·A. V. Balatsky·Jian-Xin Zhu·Q. X. Jia
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Abstract

Using polarized neutron reflectometry (PNR), we observe an induced magnetization of 75$\pm$ 25 kA/m at 10 K in a La$_{0.7}$Sr$_{0.3}$MnO$_3$ (LSMO)/BiFeO$_3$ superlattice extending from the interface through several atomic layers of the BiFeO$_3$ (BFO). The induced magnetization in BFO is explained by density functional theory, where the size of bandgap of BFO plays an important role. Considering a classical exchange field between the LSMO and BFO layers, we further show that magnetization is expected to extend throughout the BFO, which provides a theoretical explanation for the results of the neutron scattering experiment.

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S. Singh, J. T. Haraldsen, J. Xiong, E. M. Choi, P. Lu, D. Yi, X. -D. Wen, J. Liu, H. Wang, Z. Bi, P. Yu, M. R. Fitzsimmons, J. L. MacManus-Driscoll, R. Ramesh, A. V. Balatsky, Jian-Xin Zhu, Q. X. Jia. 2014-07-02. Induced magnetization in La$_{0.7}$Sr$_{0.3}$MnO$_3$/BiFeO$_3$ superlattices. https://doi.org/10.1103/physrevlett.113.047204

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