Magnetoelectric Properties of Cylindrical Ferromagnetic Particles

IF 0.4 Q4 PHYSICS, CONDENSED MATTER

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-06-25 DOI:10.1134/S1027451025700107

T. S. Shaposhnikova, R. F. Mamin

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Abstract

Within the framework of the phenomenological approach, the emergence of an inhomogeneous magnetic state and the associated appearance of inhomogeneous electric polarization in the volume of small magnetic particles have been studied. The microscopic mechanism of this relation between magnetization and polarization is due to spin-orbit interaction. The specific form of magnetization and polarization is determined by the shape and size of cylindrical particles. Using the free energy expression for magnetization, a nonuniform distribution of magnetization in the form of three-dimensional magnetic vortices is obtained. A vortex state appears only for cylinders with a radius greater than a certain critical value, while for particles with a smaller radius, a uniform magnetic state arises. In the vortex state, nonuniform electric polarization emerges. The local polarization vectors have the form of rays directed towards the cylinder axis. The region of existence of such inhomogeneous states has been determined. A change in the local electric polarization of small magnetic particles in an external magnetic field is considered. An expression for the magnetoelectric susceptibility is obtained.

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圆柱形铁磁粒子的磁电特性

在现象学方法的框架内，研究了小磁性颗粒体积中不均匀磁态的出现和相关的不均匀电极化现象。磁化与极化关系的微观机制是自旋轨道相互作用。磁化和极化的具体形式是由圆柱形粒子的形状和大小决定的。利用磁化的自由能表达式，得到了三维磁涡形式的非均匀磁化分布。只有半径大于某一临界值的圆柱体才会出现涡旋状态，而半径较小的颗粒则会出现均匀的磁性状态。在涡旋状态下，出现了不均匀的电极化。局部偏振矢量具有指向柱面轴的射线的形式。这种非均匀状态的存在范围已经确定。考虑了小磁性粒子在外加磁场作用下局部电极化的变化。得到了磁电磁化率的表达式。

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 Surface Investigation: X-ray, Synchrotron and Neutron Techniques PHYSICS, CONDENSED MATTER-

CiteScore

0.90

自引率

25.00%

发文量

144

审稿时长

3-8 weeks

期刊介绍： Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.