Abstract
We present here the detailed analysis of the magnetic behavior of the Co 0.53Ga 0.47 alloy, especially at temperatures above the freezing temperature T f = 10 K. Low field static magnetization measurements were performed by using the SQUID magnetometer in the temperature range 5–65 K and magnetic fields up to 100 Oe. The temperature dependence of the field cooled susceptibility π FC( T) at T > T f has an anomaly, which is displayed in the double change of the curvature near T s = 24 K. The data of magnetization M FC in an external field H lie on a universal curve M FC( H/ T) at temperatures T f < T < T s. The plots of π -1 FC( T) and non-linear magnetic susceptibility π nl FC( T -3) are linear lines in the temperature range T f− T s. The strong deviation of π -1 FC( T) and π nl FC( T -3) from straight line, taking place at T ≌ T s, indicates that T s is an upper temperature limit of the classical superparamagnetic behavior with the constant cluster moment. The results suggest that such phenomena may be fairly universal for spin glasses.
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