Influence of geometrical parameters of magnetic nanoparticles in a linear chain on the conditions for generation, structure, and properties of discrete breathers

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-02 DOI:10.1016/j.jmmm.2025.173250

Dmitry A. Kuzmin , Igor V. Bychkov , Evgenii G. Ekomasov

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Abstract

The study investigates the magnetization dynamics in one-dimensional chains of elliptical magnetic nanoparticles interacting via dipole–dipole interactions. Numerical simulations of the Landau–Lifshitz (LL) equations demonstrate the possibility of localized nonlinear high–amplitude magnetization oscillations in such nanoparticle chains, which manifest as discrete breathers (or intrinsic localized modes). These solutions consist of a “core,” where the magnetization vectors precess around a hard axis, and “tails,” where they oscillate around the equilibrium state. Analytical estimations of the breather frequency agree well with the numerical simulation results. The influence of the nanoparticles’ geometrical parameters on discrete breathers in a linear chain is determined. Analysis of the frequency expression shows that breathers can exist only when one of the principal axes—specifically, the one oriented perpendicular to the chain direction—is significantly smaller than the other two; that is, when the particles are nearly disk–shaped.

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线性链中磁性纳米颗粒的几何参数对离散呼吸体生成、结构和性质的影响

研究了椭圆磁性纳米颗粒一维链中偶极-偶极相互作用的磁化动力学。Landau-Lifshitz （LL）方程的数值模拟表明，在这种纳米颗粒链中存在局部非线性高振幅磁化振荡的可能性，其表现为离散呼吸（或本然局域模式）。这些解决方案由“核心”和“尾巴”组成，“核心”是磁化矢量围绕硬轴进动的地方，“尾巴”是它们围绕平衡状态振荡的地方。分析估计的呼吸频率与数值模拟结果吻合较好。确定了纳米颗粒几何参数对线性链中离散呼吸体的影响。对频率表达式的分析表明，只有当其中一个主轴（即垂直于链方向的主轴）明显小于其他两个主轴时，呼吸体才能存在；也就是说，当粒子接近圆盘形状时。

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.