Magnetic exchange coupling through a superconductor
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The magnetic exchange coupling between two ferromagnets separated by a superconducting spacer is analyzed. An indirect exchange coupling between the ferromagnets is assumed to exist when the superconductor is in its normal state. As the superconductor is cooled off below its critical temperature, the magnetic coupling changes. The appearance of the superconducting gap causes a reduction of the indirect exchange coupling existent in the normal state. This reduction occurs within a length scale controlled by the coherence length of the superconductor. The reduction of the coupling is temperature dependent, being weaker near the critical temperature and stronger at zero temperature. In addition, the change in critical temperature of the superconductor due to proximity to ferromagnets is discussed. {copyright} {ital 1997 American Institute of Physics.}
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 496586
- Report Number(s):
- CONF-961141-; ISSN 0021-8979; TRN: 97:016274
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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