Comparison of hyperfine fields and impurity magnetization in dilutePtCo alloys

Abstract

High-field nuclear orientation measurements in dilute PtCo alloys are compared with magnetization measurements by Tissier and Tournier. The results imply the proportionality of the hyperfine field $H_{\mathrm{hf}}$ and the single-impurity magnetization $M_s$, and thus of the local magnetization $M_1$ and the induced part of the giant moment $M_i$. The saturation behavior can best be fit with a simple local spin-fluctuation model giving $H_{\mathrm{hf}}\left(\mathrm{sat}\right)=212\mathrm{}$ kOe and $T_K\simeq 1$ K.