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Coexistence of spin glass and ferroelectricity in highly ordered Bi2FeMnO6 epitaxial thin film

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arxiv 1512.06360 v2 pith:VWS3DI7C submitted 2015-12-20 cond-mat.mtrl-sci

Lin Sun , Yue-Wen Fang , Jun He , Yuanyuan Zhang , Ruijuan Qi , Qing He , Rong Huang , Pinghua Xiang
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Xiao-Dong Tang Pingxiong Yang Junhao Chu Ying-Hao Chu Chun-Gang Duan
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classification cond-mat.mtrl-sci
keywords bi2femno6filmfilmsepitaxialferroelectricityhighlymagneticordered
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Highly ordered Bi2FeMnO6 epitaxial thin films have been successfully grown on SrTiO3 substrate. Both synchrotron X-ray reciprocal space mapping and high resolution transmission electron microscopy confirmed the alternative alignment of Fe and Mn along [111] direction of Bi2FeMnO6 films. Magnetic and ferroelectric properties of Bi2FeMnO6 films are characterized and analyzed. The room-temperature ferroelectricity is well kept in Bi2FeMnO6 film as expected. However, it is very interesting that Bi2FeMnO6 film exhibits a typical spin-glass behavior and very weak magnetism rather than a ferri/ferromagnetism as generally believed. Our first-principles calculations suggest a spin frustration model for Bi2FeMnO6, which can well explain the intriguing magnetic property of Bi2FeMnO6 film.

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