Observation of Robust FMR in Permalloy Quasiperiodic Arrays

We have used ferromagnetic resonance (FMR) at fixed frequency 9.7 GHz to investigate permalloy thin films patterned with antidots to form a five-fold quasicrystal pattern. For DC applied fields H below 3.5 kOe, we observed robust FMR spectra exhibiting two-fold rotational symmetry instead of the fiv...

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Veröffentlicht in:IEEE transactions on magnetics 2013-07, Vol.49 (7), p.3101-3104
Hauptverfasser: Bhat, Vinayak, Woods, J., Farmer, B., De Long, L. E., Hastings, J.T., Sklenar, J., Ketterson, J. B.
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Sprache:eng
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Zusammenfassung:We have used ferromagnetic resonance (FMR) at fixed frequency 9.7 GHz to investigate permalloy thin films patterned with antidots to form a five-fold quasicrystal pattern. For DC applied fields H below 3.5 kOe, we observed robust FMR spectra exhibiting two-fold rotational symmetry instead of the five-fold symmetry expected for quasicrystals. Dynamic micromagnetic simulations of the FMR spectra performed at {\rm H}=1\ {\rm kOe} and 12 kOe exhibit two-fold and ten-fold rotational symmetry, respectively. The ten-fold symmetry observed in simulations is consistent with a saturated state of isolated write fields. We infer the two-fold rotational symmetry observed for {\rm H}=1\ {\rm kOe} is due to an unsaturated state of five-fold write fields closely spaced on a square lattice.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2013.2239966