Mutual influence between macrospin reversal order and spin-wave dynamics in isolated artificial spin-ice vertices

F. Montoncello, L. Giovannini, Wonbae Bang, J. B. Ketterson, M. B. Jungfleisch, A. Hoffmann, B. W. Farmer, L. E. De Long

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

We theoretically and experimentally investigate magnetization reversal and associated spin-wave dynamics of isolated threefold vertices that constitute a Kagome lattice. The three permalloy macrospins making up the vertex have an elliptical cross section and a uniform thickness. We study the dc magnetization curve and the frequency versus field curves (dispersions) of those spin-wave modes that produce the largest response. We also investigate each macrospin reversal from a dynamic perspective, by performing micromagnetic simulations of the reversal processes, and revealing their relationships to the soft-mode profile calculated at the equilibrium state immediately before reversal. The theoretical results are compared with the measured magnetization curves and ferromagnetic resonance spectra. The agreement achieved suggests that a much deeper understanding of magnetization reversal and accompanying hysteresis can be achieved by combining theoretical calculations with static and dynamic magnetization experiments.

Original languageEnglish
Article number014421
JournalPhysical Review B
Volume97
Issue number1
DOIs
StatePublished - Jan 18 2018

Bibliographical note

Funding Information:
Work at Northwestern was supported by the NSF under Grant No. DMR 1507058. Work at the University of Kentucky was supported by the NSF under Grant No. DMR 1506979. Work at Argonne was supported by the U.S. Department of Energy (DOE), Office of Science, Materials Science and Engineering Division. Use was made of the Center for Nanoscale Materials, an Office of Science user facility, which is supported by DOE, Office of Science, Basic Energy Science under Contract No. DE-AC02-06CH11357.

Publisher Copyright:
© 2018 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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