Induced Ferromagnetism at BiFeO3/YBa2Cu3O7 Interfaces

被引：13
作者：
Zhu, Jian-Xin [1 ,2 ]
Wen, Xiao-Dong [1 ]
Haraldsen, J. T. [1 ,2 ,3 ]
He, Mi [4 ]
Panagopoulos, C. [4 ]
Chia, Elbert E. M. [4 ]
机构：
[1] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
[2] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA
[3] James Madison Univ, Dept Phys & Astron, Harrisonburg, VA 22807 USA
[4] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore
来源：
SCIENTIFIC REPORTS | 2014年 / 4卷
关键词：
SUPERCONDUCTIVITY; MAGNETISM;
D O I：
10.1038/srep05368
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
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.
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页数：5
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