Abstract
The Mössbauer effect has proven fruitful for investigating the magnetic properties of dilute concentrations of Fe in metals. Measurements of the magnetic hyperfine field Hhf at Fe impurities in nonmagnetic metal hosts yield information relating to the formation of localized moments and to the onset of impurity-impurity interactions. These studies fall into two classes: (A) Systems in which the impurity concentration is sufficiently low (or the measurement temperature sufficiently high) that impurity-impurity interactions play a negligible role and the Hhf depends only upon the nature of the impurity and of the host. (B) Systems in which interactions play a significant role and magnetic transitions can occur. In the first category, measurements on a number of cubic transition metals and alloys will be compared with other experimental data and with theories of the formation of localized magnetic moments. In the second category, dilute alloys of Fe with Au, and Pd will be compared with the results of other experiments and with theoretical concepts of direct and indirect exchange interactions.
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