The static and dynamic magnetic responses of patterned ferromagnetic thin films are uniquely altered in the case of aperiodic patterns that retain long-range order (e.g., quasicrystals). We have fabricated permalloy wire networks based on periodic square antidot lattices (ADLs) distorted according to an aperiodic Fibonacci sequence applied to two lattice translations, d1  = 1618 nm and d2  = 1000 nm. The wire segment thickness is fixed at t = 25 nm, and the width W varies from 80 to 510 nm. We measured the DC magnetization between room temperature and 5 K. Room-temperature, narrow-band (9.7 GHz) ferromagnetic resonance (FMR) spectra were acquired for various directions of applied magnetic field. The DC magnetization curves exhibited pronounced step anomalies and plateaus that signal flux closure states. Although the Fibonacci distortion breaks the fourfold symmetry of a finite periodic square ADL, the FMR data exhibit fourfold rotational symmetry with respect to the applied DC magnetic field direction.

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Published in Journal of Applied Physics, v. 117, no. 17, article 17B714, p. 1-3.

Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The following article appeared in Journal of Applied Physics, v. 117, no. 17, article 17B714, p. 1-3 and may be found at http://dx.doi.org/10.1063/1.4913820.

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Research at the University of Kentucky was supported by U.S. DoE Grant No. DE-FG02-97ER45653, the UK Center for Advanced Materials (supported by U.S. NSF Grant No. EPS-0814194), the UK Center for Computational Sciences, and the UK Center for Nanoscience and Engineering.

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