Classification of magnetic behavior in annealed rapid-quenched (Sm0.8Zr0.2)1.1(Fe0.9Co0.1)11.3Ti0.7 magnet powders using the stepwise measurement of the remanent magnetization

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-28 DOI:10.1016/j.jmmm.2025.173242

K. Kobayashi, T. Kuno, H. Fujiwara

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引用次数: 0

Abstract

(Sm_0.8Zr_0.2)_1.1(Fe_0.9Co_0.1)_11.3Ti_0.7 amorphous starting compound was annealed at typical temperatures of 750, 850, and 950 °C for 30 min. The obtained samples were magnetically isotropic. The highest coercivity (H_c) of 413 kA/m was found in the 850 °C/30 min sample, in which J_s = 1.43 T and H_a = 5.93 MA/m, whereas that in the 950 °C/30 min sample, in which J_s = 1.47 T and H_a = 9.21 MA/m, H_c was 246 kA/m. The obvious character of the latter sample was a multi-domain structure (MDS) in a thermally demagnetized state as observed by magneto-force microscopy, whereas a single-domain like structure (SDLS) was observed in the former and in the 750 °C/30 min (H_a = 4.41 MA/m and H_c = 216 kA/m) samples. Since we hypothesized that lower H_c in the higher H_a 950 °C/30 min sample originated from domain wall motion in the MDS, we attempted to determine the volume fraction of the MDS region in the sample. Using the modified step method for magnetically isotropic samples, we detected about 50 vol% of the MDS region in the 950 °C/30 min sample, compared with about 20 vol% in the other two samples.

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用剩余磁化强度的逐步测量方法对退火快淬（Sm0.8Zr0.2）1.1(Fe0.9Co0.1)11.3Ti0.7磁铁粉末的磁性行为进行分类

将（Sm0.8Zr0.2）1.1(Fe0.9Co0.1)11.3Ti0.7非晶起始化合物在750、850和950℃的典型温度下退火30 min，得到的样品具有磁性各向同性。850°C/30 min样品矫顽力最高，为413 kA/m， Js = 1.43 T, Ha = 5.93 MA/m； 950°C/30 min样品矫顽力最高，为246 kA/m， Js = 1.47 T, Ha = 9.21 MA/m。磁力显微镜观察到后一种样品的明显特征是热退磁状态下的多畴结构（MDS），而前一种样品和在750°C/30 min （Ha = 4.41 MA/m, Hc = 216 kA/m）下观察到的单畴结构（SDLS）。由于我们假设高温950°C/30分钟样品中的低Hc源于MDS的畴壁运动，我们试图确定样品中MDS区域的体积分数。使用改进的磁各向同性样品的步进法，我们在950°C/30 min的样品中检测到约50 vol%的MDS区域，而在其他两个样品中检测到约20 vol%。

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.