Angular-selective spin wave modes of magnetic antivortices stabilized by anisotropic Dzyaloshinskii–Moriya interactions

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-08-25 DOI:10.1016/j.jmmm.2025.173448

Felipe Tejo , Nicolas Vidal-Silva

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引用次数: 0

Abstract

The spin wave modes of antivortices hosted in circular nanodots are investigated using micromagnetic simulations. By stabilizing the antivortex configurations through the inclusion of an anisotropic Dzyaloshinskii–Moriya interaction, we analyze the distinct spin wave modes excited when a magnetic pulse is applied at an angle

θ

with respect to the nanodot’s symmetry axis. We reveal the presence of breathing and gyrotropic modes at

θ = 0 °

and

θ = 90 °

, respectively. These modes persist over a broad angular range, and their simultaneous excitation is observed at specific angles. For comparison, we perform the same analysis for antivortices hosted in rectangular nanodots and find a greater number of radial modes, along with a similar behavior regarding the coexistence of different spin wave modes across a range of excitation angles. Our results deepen the understanding of antivortex dynamics and may provide valuable insights for identifying specific spin wave modes in ferromagnetic resonance experiments with oblique excitation fields.

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各向异性Dzyaloshinskii-Moriya相互作用稳定磁反旋涡的角选择自旋波模式

利用微磁模拟研究了圆形纳米点中反旋涡的自旋波模式。通过加入各向异性Dzyaloshinskii-Moriya相互作用来稳定反涡构型，我们分析了当磁脉冲以相对于纳米点对称轴的角度θ施加时所激发的不同自旋波模式。我们发现在θ=0°和θ=90°处分别存在呼吸模式和回旋模式。这些模态在一个很宽的角度范围内持续存在，并且在特定角度观察到它们的同时激发。为了比较，我们对矩形纳米点中的反旋涡进行了相同的分析，发现了更多的径向模式，以及不同激发角范围内不同自旋波模式共存的类似行为。我们的研究结果加深了对反涡旋动力学的理解，并可能为在倾斜激励场的铁磁共振实验中识别特定的自旋波模式提供有价值的见解。

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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.