Local Environment Effect on the Atomic Magnetic Moment in Ferromagnetic Transition-Metal Alloys. III. Nonlocal Susceptibility

Abstract

A method of calculating local and nonlocal susceptibilities including exchange enhancement is presented on the basis of an effective-medium (HF-cluster-CPA) theory which was developed by Miwa and the present author. Those susceptibilities make clear characters of an atomic magnetic moment. Actual calculations are performed for Fe–V and Ni–Cu alloys. In the vicinity of the ferromagnetic critical concentrations of these alloys, Ni atomic moment with many Ni neighbors is extremely sensitive to the magnetization not only of the first-nearest-neighbor shell but also of the farther shells, while Fe atomic moment can be affected only by the magnetization of the first-nearest-neighbor shell.