Angular-dependent magnetization dynamics of kagome artificial spin ice incorporating topological defects
We report angular-dependent spin-wave spectroscopy on kagome artificial spin ice made of large arrays of interconnected Ni80Fe20 nanobars. Spectra taken in saturated and disordered states exhibit a series of resonances with characteristic in-plane angular dependencies. Micromagnetic simulations allow us to interpret characteristic resonances of a two-step magnetization reversal of the nanomagnets. The dynamic properties are consistent with topological defects that are provoked via a magnetic field applied at specific angles. Simulations that we performed on previously investigated kagome artificial spin ice consisting of isolated nanobars show characteristic discrepancies in the spin-wave modes which we explain by the absence of vertices.
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Bhat, V. S., Heimbach, F., Stasinopoulos, I., & Grundler, D. (2017). Angular-dependent magnetization dynamics of kagome artificial spin ice incorporating topological defects. Physical Review B, 96, Article 014426. https://doi.org/10.1103/PhysRevB.96.014426
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Angular-dependent magnetization dynamics of kagome artificial spin ice incorporating topological defects PhysRevB.96.014426.pdf
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