arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2405.01720cond-mat.mes-hallcond-mat.mtrl-sciphysics.app-ph
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方形人工自旋冰中的铁磁共振响应:几何结构在顶点动力学和磁构型中的作用

Ferromagnetic resonance response in square artificial spin ice: roles of geometry in vertex dynamics and magnetic configurations

G. A. Gomez-Iriarte, D. E. Gonzalez-Chavez, R. L. Sommer, J. P. Sinnecker

AI总结:

本文通过微磁学模拟研究方形人工自旋冰中纳米磁体纵横比对铁磁共振和振荡模式的影响,揭示不同顶点能量态具有独特的FMR响应,为利用FMR技术识别ASI能量态提供了新方法。

摘要:

人工自旋冰(ASI)代表一类结构独特的超晶格,由几何排列的相互作用纳米磁体组成。这种排列有助于探索磁阻挫现象及相关的自旋波动力学,为磁子学领域做出贡献。在本工作中,我们利用微磁学模拟对方形ASI晶格中的自旋波动力学进行了全面研究,明确聚焦于铁磁共振(FMR)和振荡模式。我们研究了纳米磁体尺寸的纵横比变化如何影响饱和态和剩磁态中的磁激发。我们分析了对应于边缘和体振荡模式的FMR峰频率随磁构型和纳米磁体尺寸的变化。我们重点研究了方形ASI顶点构型的剩磁态,特别关注其特征能量态(Type I、Type II、Type III和Type IV),同时详细说明了对称性如何影响振荡模式。我们观察到源自顶点的不同FMR响应,每种能量态都表现出独特的特征。我们的结果提供了一种利用FMR技术识别ASI系统中能量态的潜在方法。

英文摘要:

Artificial spin ice (ASI) represents a class of uniquely structured superlattices comprising geometrically arranged interacting nanomagnets. This arrangement facilitates the exploration of magnetic frustration phenomena and related spin wave dynamics, contributing to the field of magnonics. In this work, we present a compressive study of spin wave dynamics in square ASI lattices using micromagnetic simulations, explicitly focusing on ferromagnetic resonance (FMR) and oscillation modes. We investigate how variations in the aspect ratio of nanomagnets dimensions influence magnetic excitations in both saturated and remanent states. We analyze the frequency variations of FMR peaks corresponding to edges and bulk oscillation modes in relation to both magnetic configuration and nanomagnets dimensions. We emphasize the remanent state of square ASI vertex configurations, particularly focusing on their characteristic energy states (Type I, Type II, Type III, and Type IV), while detailing how symmetries influence oscillation modes. We observe distinct FMR responses originating from vertices, exhibiting unique characteristics for each energy state. Our results offer a potential method of utilizing the FMR technique to identify energy states in ASI systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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