標題: Tuning the Competition between Ferromagnetism and Antiferromagnetism in a Half-Doped Manganite through Magnetoelectric Coupling
作者: Yi, Di
Liu, Jian
Okamoto, Satoshi
Jagannatha, Suresha
Chen, Yi-Chun
Yu, Pu
Chu, Ying-Hao
Arenholz, Elke
Ramesh, R.
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 18-九月-2013
摘要: We investigate the possibility of controlling the magnetic phase transition of the heterointerface between a half-doped manganite La0.5Ca0.5MnO3 and a multiferroic BiFeO3 (BFO) through magnetoelectric coupling. Using macroscopic magnetometry and element-selective x-ray magnetic circular dichroism at the Mn and Fe L edges, we discover that the ferroelectric polarization of BFO controls simultaneously the magnetization of BFO and La0.5Ca0.5MnO3 (LCMO). X-ray absorption spectra at the oxygen K edge and linear dichroism at the Mn L edge suggest that the interfacial coupling is mainly derived from the superexchange between Mn and Fe t(2g) spins. The combination of x-ray absorption spectroscopy and mean-field theory calculations reveals that the d-electron modulation of Mn cations changes the magnetic coupling in LCMO, which controls the enhanced canted moments of interfacial BFO via the interfacial coupling. Our results demonstrate that the competition between ferromagnetic and antiferromagnetic instability can be modulated by an electric field at the heterointerface, providing another pathway for the electrical field control of magnetism.
URI: http://dx.doi.org/10.1103/PhysRevLett.111.127601
http://hdl.handle.net/11536/22751
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.111.127601
期刊: PHYSICAL REVIEW LETTERS
Volume: 111
Issue: 12
結束頁: 
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