Perturbation of magnetostatic modes observed by ferromagnetic resonance force microscopy

R. Urban, A. Putilin, P. E. Wigen, S. H. Liou, M. C. Cross, P. C. Hammel, M. L. Roukes

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Magnetostatic modes of yttrium iron garnet (YIG) films are investigated by ferromagnetic resonance force microscopy. A thin-film "probe" magnet at the tip of a compliant cantilever introduces a local inhomogeneity in the internal field of the YIG sample. This influences the shape of the sample's magnetostatic modes, thereby measurably perturbing the strength of the force coupled to the cantilever. We present a theoretical model that explains these observations; it shows that the tip-induced variation of the internal field creates either a local "potential barrier" or "potential well" for the magnetostatic waves. The data and model together indicate that local magnetic imaging of ferromagnets is possible, even in the presence of long-range spin coupling, through the introduction of localized magnetostatic modes predicted to arise from sufficiently strong tip fields.

Original languageEnglish (US)
Article number212410
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number21
DOIs
StatePublished - Jun 20 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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