Magnetic exchange coupling in ferromagnet/superconductor/ferromagnet multilayers

被引：81
作者：
de Melo, CARS
机构：
[1] Argonne National Laboratory, Materials Science Division, Argonne, IL
来源：
PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 10期
关键词：
D O I：
10.1103/PhysRevLett.79.1933
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The possibility of magnetic exchange coupling between two ferromagnets (F) separated by a superconductor (S) spacer is analyzed using the functional integral method. For this coupling to happen three basic conditions need to be satisfied. First, an indirect exchange coupling between the ferromagnets must exist when the superconductor is in its normal state. Second, superconductivity must not be destroyed due to the proximity to ferromagnetic boundaries. Third, roughness of the FIS interfaces must be small. The appearance of the superconducting gap causes a reduction of the indirect exchange coupling existent in the normal state. This reduction is temperature dependent, being weaker near the critical temperature and stronger at zero temperature.
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页码：1933 / 1936
页数：4
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