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arXiv · 2106.04406

Spectral-fingerprinting: Microstate readout via remanence ferromagnetic resonance in artificial spin systems

Alex Vanstone·Jack C. Gartside·Kilian D. Stenning·Troy Dion·Daan M. Arroo·Will R. Branford
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Abstract

Artificial spin ices are magnetic metamaterials comprising geometrically-tiled interacting nanomagnets. There is significant interest in these systems for reconfigurable magnonics due to their vast microstate landscape. Studies to-date have focused on the in-field GHz spin-wave response, convoluting effects from applied field, nanofabrication-imperfections ('quenched disorder') and microstate-dependent dipolar field landscapes. Here, we study artificial spin ices in pure and disordered microstates and evaluate their zero-field spectra. Removing the applied field allows us to deconvolute contributions to reversal dynamics and spin-wave spectra, directly measuring the dipolar field landscape and quenched disorder. Mode-amplitude provides population readout of nanomagnet magnetisation direction, and hence net magnetisation as well as local vertex populations. We demonstrate microstate-fingerprinting via distinct spectral-readout of three microstates with identical (zero) magnetisation, supported by simulation. These results establish remanence 'spectral-fingerprinting' as a rapid, scalable on-chip readout of both magnetic state and nanoscale dipolar field texture, a critical step in realising next-generation functional magnonic devices.

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Alex Vanstone, Jack C. Gartside, Kilian D. Stenning, Troy Dion, Daan M. Arroo, Will R. Branford. 2021-06-08. Spectral-fingerprinting: Microstate readout via remanence ferromagnetic resonance in artificial spin systems. https://doi.org/10.1088/1367-2630/ac608b

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