Magnon Modes of Microstates and Microwave-Induced Avalanche in Kagome Artificial Spin Ice with Topological Defects

V. Bhat, Sho Watanabe, Korbinian Baumgaertl, Armin Kleibert, Martin Schoen, C. A. F. Vaz, Dirk Grundler

Abstract

We investigate spin dynamics of microstates in artificial spin ice (ASI) in ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$ nanomagnets arranged in an interconnected kagome lattice using microfocus Brillouin light scattering, broadband ferromagnetic resonance, magnetic force microscopy, x-ray photoemission electron microscopy, and simulations. We experimentally reconfigure microstates in ASI using a 2D vector field protocol and apply microwave-assisted switching to intentionally trigger reversal. Our work is key for the creation of avalanches inside the kagome ASI and reprogrammable magnonics based on ASIs.

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• Physical Review Letters - View
• arXiv (Cornell University) - View - PDF
• Infoscience (Ecole Polytechnique Fédérale de Lausanne) - View - PDF
• DORA PSI (Paul Scherrer Institute) - View - PDF
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