Исследование магнитных наночастиц оксида железа, покрытых оксидом кремния, методом ферромагнитного резонанса

Физика твердого тела Pub Date : 2023-01-01 DOI:10.21883/ftt.2023.06.55644.01h

И. Г. Важенина, Сергей Викторович Столяр, А. В. Тюменцева, Михаил Н. Волочаев, Р. С. Исхаков, Сергей В. Комогорцев, В.Ф. Пьянков, Е. Д. Николаева

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Abstract

Magnetic nanoparticles of magnetite with a size of ~8 nm synthesized with a different type of coating were studied by ferromagnetic resonance in the temperature range from 7 to 300 K. The features of the experimental temperature dependences of the parameters of the ferromagnetic resonance curve (the magnitude of the resonant field, line width and intensity) and their approximation allowed us to estimate the values of characteristic temperatures. Firstly, the value of the Vervey temperature and the dependence of its value on the type of coating were determined. Secondly, the temperature of transition of nanoparticles to the superparamagnetic state (blocking temperature) and the temperature range within which the magnetic structure of the outer shell of the magnetic nanoparticle is in the spin glass state are established

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铁磁共振法，氧化铁磁性纳米颗粒研究

采用铁磁共振技术，在7 ~ 300 K的温度范围内，用不同类型的涂层合成了尺寸为~8 nm的磁性纳米颗粒。实验温度与铁磁共振曲线参数(共振场的大小、线宽和强度)的关系及其近似值使我们能够估计出特征温度的值。首先，确定了维维温度的取值及其与涂层类型的关系。其次，确定了纳米粒子向超顺磁态(阻断温度)转变的温度范围以及磁性纳米粒子外壳的磁性结构处于自旋玻璃态的温度范围

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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Физика твердого тела

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