EXCHANGE COUPLING THROUGH COMPOSITE NONMAGNETIC SPACER LAYER IN MAGNETIC SUPERLATTICES

摘要

We calculated the exchange coupling between ferromagnetic layers in magnetic sandwiches, in which a potential scattering layer is inserted in a nonmagnetic spacer layer. The Green's function method is used for the calculation. The numerical results are obtained with varying the potential height and width. The Rudennann-Kittel-Kasuya-Yoshida-like exchange coupling is changed significantly in phase and amplitude with increasing the change of the potential barrier properties. However, the change of the oscillation period is not so remarkable. It is shown from the numerical results that the transition from ferromagnetic to antiferromagnetic coupling, or the reverse, can be induced by changing the potential parameters under a definite structure of magnetic sandwiches. (C) 1997 American Institute of Physics. References: 31