Effect of Adding of V and Co Atoms on the Spin Glass Transition Temperature of Fe0.7-xMxAl0.30Alloys

Magnetization measurements on zero field cooled (M Z F C ) and field cooled (M F C ) with temperature T were made on Fe 0 . 7 - x M x Al 0 . 3 0 alloys (where M = Co or M = V). Compared to Co and V free alloy Fe 0 . 7 Al 0 . 3 0 our results revealed that an addition of small amount of M == Co with 0 < x < 0.10 shows linear decrease in the transition temperature T f as x increases. Addition of small amount of M = V with It < x ≤ 0.1 shows gradual decrease in T f with increasing x. The relative changes in T f show that an addition of V atoms is of more significance than addition of Co atoms. There is a twofold decrease which could be attributed to the ferromagnetic nature of Co atoms and to the random fields.