Study of vector fields topology of magnetic multipoles using the magneto-optical Kerr effect

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-11 DOI:10.1016/j.jmmm.2025.173175

V.E. Ivanov, L.G. Boguslavskiy, V.N. Lepalovskij

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Abstract

The work develops the study of the topological structure of inhomogeneous magnetic fields of ideal circular multipoles using magneto-optical images. Magneto-optical visualization of the in plane component field of multipoles having a multipole degree from n = 0 to n = 4 revealed the presence of alternating brightness sectors, the number of which is

S = 2 (n + 1) .

Vectorization of magneto-optical images of these fields showed that the Poincaré index of the fields of these systems is

χ_{n} = n + 1

. The application of a homogeneous bias field in the plane of the indicator film causes the entry into the field of view of saddle-shaped singular points, the number of which coincides with the Poincaré index. It is shown that the topological structure of the field is not an unambiguous characteristic of the geometry of magnetic systems, including under the action of the bias field.

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利用磁光克尔效应研究磁多极子的矢量场拓扑

利用磁光图像对理想圆多极子非均匀磁场的拓扑结构进行了研究。对多极度为n = 0 ~ n = 4的平面分量场进行磁光可视化，发现存在交替的亮度扇区，其数量为S=2（n+1）。对这些场的磁光图像进行矢量化，结果表明这些系统的场的poincar指数为χn=n+1。在指示膜平面上施加均匀偏置场，使鞍形奇点进入视场，奇点的个数与庞卡罗指数一致。结果表明，磁场的拓扑结构并不是磁系统几何结构的明确特征，包括在偏置场的作用下。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.