Abstract
The ac linear (χ 0 ) and nonlinear (χ 2 ) susceptibilities of ferromagnetic fine cobalt particles, which were precipitated in a Cu 97 Co 3 alloy, have been studied. The linear susceptibility χ 0 has a spin-glass-like maximum at low temperature. The nonlinear susceptibility χ 2 is negative and has a peak around the temperature where χ 0 exhibits the maximum. However, the negative peak in χ 2 is very broad compared with that of spin glasses. Furthermore, χ 2 is proportional to T -3 at high temperatures. This behavior of χ 2 in the Cu 97 Co 3 alloy is essentially different from the divergent behavior of χ 2 in spin glasses.
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