Magnetic field dependence of quantized and localized spin wave modes in thin rectangular magnetic dots

G. Gubbiott*, M. Conti, G. Carlotti, P. Candeloro, Enzo Di Fabrizio, K. Yu Guslienko, A. Andre, C. Bayer, A. N. Slavin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

The magnetic field dependences of the frequencies of standing spin-wave modes in a tangentially magnetized array of thin rectangular permalloy dots (800 x 550 nm) were measured experimentally by a Brillouin light scattering technique and calculated theoretically using an approximate size-dependent quantization of the spin-wavevector components in the dipole-exchange dispersion equation for spin waves propagating in a continuous magnetic film. It was found that the inhomogeneous internal bias magnetic field of the dot has a strong influence on the profiles of the lowest spin-wave standing modes. In addition, the dynamic magnetization distributions found for both longitudinally and transversely magnetized long magnetic stripes gives a good approximation for mode distributions in a rectangular dot magnetized along one of its in-plane sides. An approximate analytic theory of exchange-dominated spin-wave modes, strongly localized along the dot edge that is perpendicular to the bias magnetic field, is developed. A good quantitative agreement with the results of the BLS experiment is found.

Original languageEnglish (US)
Pages (from-to)7709-7721
Number of pages13
JournalJournal of Physics Condensed Matter
Volume16
Issue number43
DOIs
StatePublished - Nov 3 2004

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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