Rotational hysteresis of elongated-single-domain particles by chain-of-spheres model

Abstract

The behavior of the magnetization of a chain of spheres contacting each other with an area in a rotating uniform magnetic field is studied. The rotational hysteresis integral R_h for the parallel‐rotation mechanism is found to be 0.414 for the aligned and planar randomness, and to be 0.379 for the spherical randomness of orientation in assemblies of the chains of spheres. These values are found to be independent of the number of spheres N and of the contacting area. For the fanning mechanism, R_h is found to increase, reach the maximum value, and decrease abruptly to 0 with an increase in the contacting area. And in this case, R_h varies with N and the contacting area from 0.975 to 4 for the aligned and planar randomness, and from 0.670 to π for the spherical randomness of orientation in assemblies of the chains.