Brillouin light scattering spectral fingerprinting of magnetic microstates in artificial spin ice

IF 13.2 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Amrit Kumar Mondal , Avinash Kumar Chaurasiya , Kilian D. Stenning , Alex Vanstone , Jack C. Gartside , Will R. Branford , Anjan Barman
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引用次数: 0

Abstract

The family of nanomagnetic arrays termed artificial spin ice (ASI) possess a vast range of metastable microstates. These states exhibit both exotic fundamental physics and more recently applied functionality, garnering attention as reconfigurable magnonic circuits and neuromorphic computing platforms. However, open questions remain on the role of microstate imperfections or angular disorder – particularly in the GHz response of the system. We report a study on the GHz dynamics of a series of five carefully prepared microstates in the same ASI sample, with both coexistence of vortex and uniformly magnetized macrospins, and disorder in the orientation of the macrospins at different vertices. We observe microstate-specific mode frequency shifting, mode creation and mode crossing. This versatility of characteristic spin-wave (SW) peaks for specific magnetic microstates in ASI enables identification of microstate configurations via SW spectral characterization. The wide reconfigurability of microstate-specific SW dynamics also opens avenues for developing rich magnonic devices operating in the GHz frequency regime and advances the understanding of ASI physics.

人工自旋冰中磁性微态的布里渊光散射光谱指纹图谱
被称为人造自旋冰(ASI)的纳米磁阵列家族拥有多种可蜕变的微观状态。这些状态既展现了奇异的基础物理学,又具有最新的应用功能,作为可重新配置的磁性电路和神经形态计算平台而备受关注。然而,微态缺陷或角度无序的作用--尤其是在系统的 GHz 响应中的作用--仍然是一个未决问题。我们报告了在同一个 ASI 样品中精心制备的一系列五个微态的 GHz 动态研究,这些微态既有涡旋和均匀磁化大螺旋的共存,也有不同顶点大螺旋取向的无序。我们观察到微态特定的模式频率移动、模式创建和模式交叉。ASI 中特定磁性微态的特征自旋波(SW)峰的这种多功能性,使我们能够通过 SW 光谱特性鉴定微态配置。微态特异性 SW 动态的广泛可重构性还为开发在 GHz 频率机制下运行的丰富磁性器件开辟了途径,并推进了对人工晶体物理的理解。
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来源期刊
Nano Today
Nano Today 工程技术-材料科学:综合
CiteScore
21.50
自引率
3.40%
发文量
305
审稿时长
40 days
期刊介绍: Nano Today is a journal dedicated to publishing influential and innovative work in the field of nanoscience and technology. It covers a wide range of subject areas including biomaterials, materials chemistry, materials science, chemistry, bioengineering, biochemistry, genetics and molecular biology, engineering, and nanotechnology. The journal considers articles that inform readers about the latest research, breakthroughs, and topical issues in these fields. It provides comprehensive coverage through a mixture of peer-reviewed articles, research news, and information on key developments. Nano Today is abstracted and indexed in Science Citation Index, Ei Compendex, Embase, Scopus, and INSPEC.
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