Direct Observation of Magnon Modes in Kagome Artificial Spin Ice with Topological Defects

Abstract

We investigate spin dynamics of artificial spin ice (ASI) where topological defects confine magnon modes in Ni${}_{81}$Fe${}_{19}$ nanomagnets arranged on an interconnected kagome lattice. Brillouin light scattering microscopy performed on magnetically disordered states exhibit a series of magnon resonances which depend on topological defect configurations detected by magnetic force microscopy. Nanomagnets on a Dirac string and between a monopole-antimonopole pair show pronounced modifications in magnon frequencies both in experiments and simulations. Our work is key for the creation and annihilation of Dirac strings via microwave assisted switching and reprogrammable magnonics based on ASIs.

arXiv commentfive pages and three figures

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• Ni${}_{80}$Fe${}_{20}$ Nanotubes with Optimized Spintronic Functionalities Prepared by Atomic Layer Deposition
• Dynamic coupling and spin-wave dispersions in a magnetic hybrid system made of an artificial spin-ice structure and an extended NiFe underlayer
• Observation of mode splitting in artificial spin ice
• Comparison of Spin-Wave Modes in Connected and Disconnected Artificial Spin Ice Nanostructures Using Brillouin Light Scattering Spectroscopy
• A Brillouin light scattering study of the spin-wave magnetic field dependence in a magnetic hybrid system made of an artificial spin-ice structure and a film underlayer
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• Artificial Spin Ice: A Tutorial on Design and Control of Geometry, Microstate, Magnon Dynamics & Neuromorphic Computing
• Local ferromagnetic resonance measurements of mesoscopically patterned ferromagnets using deterministically placed nanodiamonds
• Observation and Control of Chiral Spin Frustration in BiYIG Thin Films