Abstract
Low-field magnetization measurements are reported for a-Fe12Ni63G25 and a-Fe7Ni73G20. These are highly concentrated spin glasses since the critical Fe concentrations (xc) for onset of ferromagnetism are 12.4 and 7.7, respectively. Whereas the nonlinear susceptibility shows the expected rapid rise near Tg, it is remarkable that the close proximity to xc reveals itself via a similar sharp increase in the linear susceptibility. It turns out that all the data can be represented by a single empirical form: χ(t)=[χ(Tg)t−γ]/[Aχ(Tg)+t−γ].
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