Effect of the formation of stabilized and movable domain walls on the shape of hysteresis loops

Abstract

It is shown that the domain structure, the properties of the special domain walls, and the shapes of the hysteresis loops can be explained by variations of K1 and Is versus temperature, and by the existence of an induced anisotropy. The various shapes of the loops are given and discussed. It is further shown why materials with Perminvar effect exhibit a specific evolution of the minor hysteresis loops with temperature changes, and the results obtained by Michalowsky are discussed.

Low‐temperature magnetic properties of magnetite using first‐order reversal curve analysis: Implications for the pseudo‐single‐domain state

“…For example, if a twin boundary divides twins with orthogonal c axis directions, the associate 90° magnetic domain boundary is likely to be immobilized. In this case, remagnetization may occur within individual twins either by the nucleation of reversed magnetization regions within the initial domains or by the formation of additional mobile 180° domain walls in the fashion observed by Paulus and Simonet [1971] in a perminvar‐manifesting monocrystal of Co‐doped Ni‐ferrite.…”

Memory effects of induced magnetic anisotropy

“…In work [7], the authors address the evolution of strangulation formed in a zero magnetic field in ferrites Fe 3-х Ni х O 4 with cobalt impurities during their cooling -heating without a magnetic field. It is reported that strangulations in individual magnetization hysteresis loops are observed in the stabilized domain structure formed at certain temperature in the region of a zero magnetic field.…”