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arXiv 1407.0722cond-mat.str-elcond-mat.mtrl-sci
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BiFeO3/YBa2Cu3O7界面的感生铁磁性

Induced Ferromagnetism at BiFeO3/YBa2Cu3O7 Interfaces

Jian-Xin Zhu, Xiao-Dong Wen, J. T. Haraldsen, Mi He, C. Panagopoulos, Elbert E. M. Chia

摘要:

过渡金属氧化物(TMOs)表现出从高温超导、巨磁电阻到磁性和铁电性等众多现象。此外,当TMO相互连接时,可能会出现新的功能,这些功能在单个组件中是不存在的。在这里,我们报告的结果从第一性原理计算的磁性在BiFeO 3/YBa 2 Cu 3 O 7界面。通过比较各种磁自旋配置内BiFeO 3的总能量,我们能够表明,金属铁磁性的界面附近诱导。我们进一步开发了一个界面交换耦合模型,并将提取的交换耦合相互作用强度,从第一性原理计算,到一个通用的相图。我们的结论证实了界面铁磁性的存在下的磁滞回线场依赖的磁化数据。界面铁磁性的出现应该对电子和输运性质有影响。

英文摘要:

Transition metal oxides (TMOs) exhibit many emergent phenomena ranging from high-temperature superconductivity and giant magnetoresistance to magnetism and ferroelectricity. In addition, when TMOs are interfaced with each other, new functionalities can arise, which are absent in individual components. Here, we report results from first-principles calculations on the magnetism at the BiFeO3/YBa2Cu3O7 interfaces. By comparing the total energy for various magnetic spin configurations inside BiFeO3, we are able to show that a metallic ferromagnetism is induced near the interface. We further develop an interface exchange-coupling model and place the extracted exchange coupling interaction strengths, from the first-principles calculations, into a resultant generic phase diagram. Our conclusion of interfacial ferromagnetism is confirmed by the presence of a hysteresis loop in field-dependent magnetization data. The emergence of interfacial ferromagnetism should have implications to electronic and transport properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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