Magnetic properties of an exchange-coupled biferromagnetic interface

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Abstract
The theory of an exchange-coupled biferromagnetic interface is developed within the spin-wave approximation. The Green's function for such an interface is derived and used to evaluate the magnetic properties of the interface. It is shown that under certain circumstances either 0, 1, or 2 branches of interface magnons may exist. These magnons exist either above the bulk subbands of the two ferromagnets forming the interface or inside the gap, if such a gap exists. The low-temperature behavior of the interface magnetization is derived and is shown to depend on the bulk properties of the two ferromagnets only.