The magnetization reversal processes of Sm2Gd10.5Fe8Co64Zr2.5Cu13 alloy in the as-quenched state

The magnetization reversal processes of the as-quenched Sm2Gd10.5Fe8Co64Zr2.5Cu13 ribbons obtained by melt-spinning method have been investigated. From the analysis of the initial magnetization curve it was deduced that the main mechanism of magnetization reversal process is the pinning of domain walls at the grain's boundaries. From the dependence of the reversible magnetization components as a function of magnetic field it was found that reversible rotation of magnetic moment vector results in high initial values of this component. The presence of several maxima on the differential susceptibility curves derived from the irreversible magnetization component in both direction of magnetization implies existence of several pinning sites for domain walls. The interaction between the alloy grains have been examined by using the so-called δm(μ0Hi) plot. The values of δm(μ0H) for investigated alloy remains positive for an applied field up to 1.15 T and negative for higher fields. Such behavior of δm(μ0Hi) dependence certifies that the dominant interaction between grains is the short range exchange interactions but low values of δm(μ0H) implies that these interactions are week.