Abstract
The magnetic properties of polycrystalline and single-crystalline Fe 1− x Co x Be 2 were investigated by magnetization, Mössbauer, and torque measurements. Curie temperature (880 K at x=0) and magnetic moment (1.94 μ B at 5 K for a specimen with x=0) decrease with increasing content of Co. The Co-content dependence of the magnetic moment could be explained by considering magnetic moments of Co. Co seems to have a magnetic moment induced by an interaction between Co and the nearest neighbor iron atoms. Hexagonal anisotropy constants were determined as K u1=9.7×10 5 erg/cm 3 and K u2=9.9×10 4 erg/cm 3 for a specimen with x=0 and K u1=3.4×10 5 erg/cm 3 and K u2=3.3×10 4 erg/cm 3 for x=0.1. Co substitution is ineffective to the improvement of the magnetic anisotropy of FeBe 2.
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