Using NMR linewidth broadening for magnetic characterization of micrometer-size particles in silicone matrix

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

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-08 DOI:10.1016/j.jmmm.2024.172644

Yu Hao , Janusz H. Hankiewicz , Robert E. Camley , Stephen E. Russek , Zbigniew Celinski

引用次数: 0

Abstract

Standard magnetization measurements on samples of small magnetic particles may generate conflicting results. We compare the mass magnetization of MgZn ferrite particles in a compressed bulk material and in dry powder and find that at low fields the values can differ by as much as 50%. We show here that embedding the particles in a silicone matrix and measuring the NMR linewidth in combination with simulations establishes a new method to evaluate the magnetization of the particles at different fields and temperatures. The NMR results agree with the direct magnetization measurements of the powder samples and the magnetization measurements of the particles embedded in silicone. This work is motivated, in part, by studies on using small magnetic particles as MRI temperature indicators, and we compare the effectiveness of these particles for low-field and high-field MRI thermometry.

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利用核磁共振线宽拓宽对硅基质中的微米级颗粒进行磁性表征

对小磁性颗粒样本进行标准磁化测量可能会产生相互矛盾的结果。我们比较了压缩块状材料和干粉中 MgZn 铁氧体颗粒的质量磁化，发现在低磁场下，两者的磁化值相差可达 50%。我们在此表明，将颗粒嵌入硅胶基质中并结合模拟测量核磁共振线宽，可建立一种新方法来评估颗粒在不同磁场和温度下的磁化。核磁共振结果与粉末样品的直接磁化测量结果以及嵌入硅胶中的颗粒的磁化测量结果一致。这项工作的部分动机来自将小磁性颗粒用作磁共振成像温度指示器的研究，我们比较了这些颗粒在低磁场和高磁场磁共振成像温度测量中的有效性。

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.