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Wu, Liang; Chen, Mingfeng; Li, Changjian; Zhou, Jun; Shen, Lei; Wang, Yujia; Zhong, Zhicheng; Feng, Ming; Zhang, Yujun; Han, Kun; Venkatesan, T. Venky; Pennycook, Stephen J.; Yu, Pu; Ma, Jing; Wang, X. Renshaw; Nan, Ce-Wen
Materials Research Letters, 20/9/2/, Letnik: 6, Številka: 9Report
Interfacial magnetism at transition-metal oxide interfaces is of tremendous interest. The emergence of ferromagnetism and a matrix-dependent charge transfer between Co and Mn ions in the interdiffusion region of compressively strained LaMnO 3 -LaCoO 3 superlattices (SLs) were studied. The SLs exhibit considerable ferromagnetism, which is negligible in both constituents. This is explained by the matrix-dependent charge transfer between Co and Mn ions. That is, the valence state of diffused Co ions into LaMnO 3 shifts from 3+ to 2+ by adopting one electron from Mn 3+ , inducing the same amount of Mn 4+ , while the Mn ions that diffuses into LaCoO 3 remains Mn 3+ . Matrix-dependent charge transfer effect was induced by the interplay between intrinsic and extrinsic effect in transition-metal oxides superlattices, which could be used to site-selectively modulate the electronic and magnetic states.
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