Abstract
Thermal magnetic fluctuations of the amorphous metallic spin glasses (Fe 0.10Ni 0.90) 75P 16B 6Al 3 and (Fe 0.06Ni 0.94) 75P 16B 6Al 3 have been investigated in a SQUID magnetometer. The observed power spectra display 1 f behaviour and are found to be related to the out-of-phase component of the ac susceptibility, in accordance with the predictions of the fluctuation dissipation theorem.
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