核壳交换耦合对铁磁性纳米粒子接近磁饱和的影响

IF 2.6 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Magnetochemistry Pub Date : 2024-07-01 DOI:10.3390/magnetochemistry10070047

Sergey V. Komogortsev, S. Stolyar, Alexey A. Mokhov, V. A. Fel’k, D. Velikanov, R. Iskhakov

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引用次数: 0

摘要

普遍接受的氧化铁核壳纳米粒子磁性结构模型包括一个单域磁有序核，其周围是一个具有凝固自旋紊乱的层。由于外壳和内核之间存在交换耦合，自旋紊乱会导致内核磁化不均匀。外部磁场对这种不均匀性的抑制会导致磁化的非线性行为，即磁场在接近磁饱和区域的函数。为描述这种效应而提出的方程通过微磁模拟进行了测试。利用该方程分析氧化铁纳米粒子在不同温度下接近磁饱和的过程，可用于估算核壳耦合能的温度演化、均匀磁化纳米粒子核的尺寸以及该尺寸的温度行为。

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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Effect of the Core–Shell Exchange Coupling on the Approach to Magnetic Saturation in a Ferrimagnetic Nanoparticle

The generally accepted model of the magnetic structure of an iron oxide core‒shell nanoparticle includes a single-domain magnetically ordered core surrounded by a layer with a frozen spin disorder. Due to the exchange coupling between the shell and core, the spin disorder should lead to nonuniform magnetization in the core. Suppression of this inhomogeneity by an external magnetic field causes the nonlinear behavior of the magnetization as a function of the field in the region of the approach to magnetic saturation. The equation proposed to describe this effect is tested using a micromagnetic simulation. Analysis of the approach to magnetic saturation of iron oxide nanoparticles at different temperatures using this equation can be used to estimate the temperature evolution of the core‒shell coupling energy and the size of the uniformly magnetized nanoparticle core and the temperature behavior of this size.

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来源期刊

Magnetochemistry Chemistry-Chemistry (miscellaneous)

CiteScore

3.90

自引率

11.10%

发文量

145

审稿时长

11 weeks

期刊介绍： Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.