The effect of annealing on the magnetic properties of glassy Fe₇₁Zr₇B₂Cr₂₀ alloys

Abstract
We have studied the de-magnetization properties and the ac-suscetibility of as-quenched and annealed Fe₇₁Zr₇B₂Cr₂₀ alloys. With increasing temperature, magnetization increased first, reached a maximum value at around 30 K and then decreased. The increase of magnetization with increasing temperature at low temperature seems to be related with the competing interactions. The annealed sample shows much smaller elastic part of the succeptibility at low temperatures and decreases almost linearly with temperature up to the T_c of the samples. Especially for the sample annealed at the higher with temperature T_ann = 657 °C, the situation shows a visually loss-less reversible magnetization process. The very broad and very high less-peak for the 10 Oe measurement clearly suggests that H_c of the material has been surpassed and the magnetization process is mainly irreversible.