非晶态铁磁体中复杂磁化率的无序驱动临界行为

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-24 DOI:10.1016/j.jmmm.2025.173080

Songül Özüm , Gül Gülpınar , Elif Sünnetci , Rıza Erdem

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引用次数: 0

摘要

在线性响应理论的框架下，分析了单轴各向异性波动项Blume-Capel模型复杂磁化率的无序驱动临界、多临界和相共存特性。广义磁通与广义力的共轭表达式为磁化强度的时间导数。动力学方程在正弦外磁场中的平稳解得到磁色散和磁吸收因子χ1(ω), χ2（ω）。对交流磁化率的热行为进行了彻底的研究，重点是在一、二阶和三临界点附近的磁色散和吸收因子的温度依赖性。晶体场的方差χ1（ω）和χ2（ω）显示在有序临界点和无序临界点之间的两个连续一阶转变的邻域，其中相变发生在有序相和部分有序相之间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Disorder-driven critical behavior of complex susceptibility in an amorphous ferromagnet

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Disorder-driven critical behavior of complex susceptibility in an amorphous ferromagnet

The disorder-driven critical, multicritical, and phase coexistence characteristics of the complex magnetic susceptibility for the Blume-Capel model with a uniaxial anisotropy term that fluctuates in magnitude are analyzed within the framework of the linear response theory. The generalized flux conjugate to its generalized force is formulated as the time derivative of the magnetization. The stationary solution of the kinetic equation in a sinusoidal external magnetic field yields the magnetic dispersion and absorption factors

χ_{1} (ω)

χ_{2} (ω)

. The thermal behavior of ac susceptibility is examined thoroughly, focusing on the temperature dependencies of magnetic dispersion and absorption factors near first, second-order, and tricritical points. Crystal field variances of

χ_{1} (ω)

and

χ_{2} (ω)

are shown in the neighborhood of two successive first-order transitions between ordered and disordered critical points, where phase transitions occur between ordered and partly ordered phases.

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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.