Abstract
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.
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