Abstract
The behavior of magnetic dislocations (MDs) in an alternating harmonic magnetic field in iron garnets has been experimentally investigated. The results are presented for single-crystal plates in which the drift of domain walls is observed in fields of sound frequencies. It is found that MDs in a stripe domain structure are able to move not only along but also across domain walls. A pairwise interaction between magnetic dislocations when they approach each other to distances on the order of the sizes of the cores of MDs is revealed. The processes of the annihilation, mutual passing of magnetic dislocations through each other and overtaking are found. The features of the dynamic behavior of MDs are explained using a mechanism based on the presence of vertical Bloch lines in a structure of domain walls. MDs are formed at nucleation centers, and their nucleation field is lower than the drift-starting field, which corresponds to previously proposed dislocational mechanism of the drift. The dependencies of quantitative parameters of the drift and MDs on amplitude and frequency of the pumping field are determined. The behavior of MDs should be considered when analyzing the mechanisms for magnetization and temperature-dependent phase transitions in magnetic layers.
Highlights
One of the first papers in which magnetic dislocations were considered is12
To explain the observed transversal movement of magnetic dislocations (MDs), we propose a mechanism based on an MD core structure model that includes vertical Bloch lines (VBLs) (Fig. 7)
This paper is the first to experimentally consider the dynamic behavior of a stripe domain structure with active centers of nucleation of magnetic dislocations subjected to an AC magnetic field at frequencies of 25–1200 Hz
Summary
One of the first papers in which magnetic dislocations were considered is. the analysis reported in was performed for isotropic media; it has limited applicability to real magnetics. The role of MDs in changing the type of a DS under varying simulation temperatures was theoretically studied in. There are currently no papers devoted to studying the dynamic behavior of MDs in alternating magnetic fields. Investigations were performed on anisotropic single-crystal plates of rare-earth iron garnets subjected to alternating magnetic fields. A new mechanism for the change in the magnetization distribution during the dynamic magnetization and remagnetization of a crystal is described. This mechanism is the movement of an MD in a system of stripe domains accompanied by the switching of the magnetization of an MD. The process of nucleation of MDs in an alternating magnetic field was studied
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