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.


Published in:
Physical Review B Condensed Matter, 96, 014426
Year:
2017
Publisher:
College Pk, Amer Physical Soc
ISSN:
0163-1829
Keywords:
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 Record created 2017-07-18, last modified 2018-03-17

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