Magnetization Processes in Non-Single Domain Magnetite Particles

IF 0.48 Q4 Physics and Astronomy Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-01-17 DOI:10.1134/S1062873824708705

N. A. Usov, O. N. Serebryakova

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Abstract

Quasi-static hysteresis loops of spherical and spheroidal magnetite nanoparticles with semi-axes ratio a/b = 1.5 and 2.0 with different types of combined magnetic anisotropy are calculated using numerical simulation. For particles of each type the critical diameters D_cr are determined so that above D_cr the magnetization curling becomes the easiest mode of particle magnetization reversal. The hysteresis loops are calculated both for single-domain nanoparticles in the diameter range D_cr < D ≤ D_c, and for vortex particles with diameters D > D_c, where D_c is the single-domain diameter. The results obtained are compared with the hysteresis loops of single-domain particles with uniform magnetization rotation. The remanent magnetization and coercive force of oriented and non-oriented dilute assemblies of magnetite nanoparticles with different aspect ratios are determined as the functions of the transverse particle diameter.

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非单畴磁铁矿颗粒的磁化过程

采用数值模拟方法计算了半轴比为a/b = 1.5和2.0的球形和球形磁铁矿纳米颗粒在不同组合磁各向异性下的准静态磁滞回线。对于每种类型的颗粒，确定了临界直径Dcr，在Dcr以上，磁化卷曲成为颗粒磁化反转的最简单方式。计算了单畴纳米颗粒在直径范围Dcr <；D≤Dc，对于直径为D >的涡旋粒子；Dc，其中Dc是单畴直径。所得结果与均匀磁化旋转的单畴粒子的磁滞回线进行了比较。研究了不同长径比的有向和无向稀释磁铁矿纳米粒子的剩余磁化强度和矫顽力随横向粒径的变化规律。

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来源期刊

Bulletin of the Russian Academy of Sciences: Physics Physics and Astronomy-Physics and Astronomy (all)

CiteScore

0.90

自引率

0.00%

发文量

251

期刊介绍： Bulletin of the Russian Academy of Sciences: Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It presents full-text articles (regular, letters to the editor, reviews) with the most recent results in miscellaneous fields of physics and astronomy: nuclear physics, cosmic rays, condensed matter physics, plasma physics, optics and photonics, nanotechnologies, solar and astrophysics, physical applications in material sciences, life sciences, etc. Bulletin of the Russian Academy of Sciences: Physics focuses on the most relevant multidisciplinary topics in natural sciences, both fundamental and applied. Manuscripts can be submitted in Russian and English languages and are subject to peer review. Accepted articles are usually combined in thematic issues on certain topics according to the journal editorial policy. Authors featured in the journal represent renowned scientific laboratories and institutes from different countries, including large international collaborations. There are globally recognized researchers among the authors: Nobel laureates and recipients of other awards, and members of national academies of sciences and international scientific societies.