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arXiv · 1201.0482

Localized domain-wall excitations in patterned magnetic dots probed by broadband ferromagnetic resonance

F. G. Aliev·A. A. Awad·D. Dielman·A. Lara·V. Metlushko·K. Y. Guslienko
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Abstract

We investigate the magnetization dynamics in circular Permalloy dots with spatially separated magnetic vortices interconnected by domain walls (double vortex state). We identify a novel type of quasi one-dimensional (1D) localised spin wave modes confined along domain walls, connecting each of two vortex cores with two edge half-antivortices. Variation of the mode eigenfrequencies with the dot size is in quantitative agreement with the developed model, which considers a dipolar origin of the localized 1D spin waves or so-called Winter\'s magnons [J.M. Winter, Phys.Rev. 124, 452 (1961)]. These spin waves are analogous to the displacement waves of strings, and could be excited in a wide class of patterned magnetic nanostructures possessing domain walls, namely in triangular, square, circular or elliptic magnetic dots.

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F. G. Aliev, A. A. Awad, D. Dielman, A. Lara, V. Metlushko, K. Y. Guslienko. 2012-01-02. Localized domain-wall excitations in patterned magnetic dots probed by broadband ferromagnetic resonance. https://doi.org/10.1103/physrevb.84.144406

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