Angular-dependent spin dynamics of a triad of permalloy macrospins

Wonbae Bang, F. Montoncello, M. B. Jungfleisch, A. Hoffmann, L. Giovannini, J. B. Ketterson

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16 Scopus citations

Abstract

We experimentally and theoretically characterize the angular-dependent microwave response of three-macrospin-vertex structures that can serve as a node in various spin ice lattices. The macrospins consist of patterned permalloy thin films with an elliptical cross section together with an in-plane aspect ratio allowing an Ising-like behavior together with bulk modes as low-frequency excitations in the field range of interest. Various branches of the frequency-magnetic field curves display atypical behaviors and discontinuities, together with softening due to macrospin reversals. The overall behavior observed accurately corresponds to a superposition of the spectra of the individual macrospins. The measured ferromagnetic resonance spectra are in good agreement with theoretical modeling. In particular, they reveal a close correlation between the field direction (relative to the individual macrospins), and the corresponding frequency-magnetic field curve, i.e., between the geometry and the magnetic response.

Original languageEnglish (US)
Article number014415
JournalPhysical Review B
Volume99
Issue number1
DOIs
StatePublished - Jan 14 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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