Observation of coupled magnetic vortex structure dynamics by time-resolved magneto-optical Kerr effect microscopy

Roman Autos, Jaroslav Hamrle, Hiroaki Masaki, Takashi Kimura, Junya Shibata, Yoshichika Otani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We report on the development of an analytical theory and a method of experimental observation of dynamic propertied of magnetic vortices excited in cylindrical ferromagnetic discs magnetostatically coupled into arrays. The theory, based on Thiele's equation of motion and the approximative rigid-vortex model, enables us to determine the eigenfrequencies of the vortices' harmonic oscillation within pairs [J. Shibata et al., Phys. Rev. B 67, 224404 (2003)] awl large arrays [J. Shibata and Y. Otani, Phys. Rev. B 70, 012404 (2004)] of the discs, the latter being a proposal to design a new type of artificial crystals with magnonic band structures. Then we briefly describe the basic principles of our time-resolved Kerr microscope and show the capabilities of our method to detect all the features studied theoretically. Finally we present an experimental example of observation of the dynamic evolution of short-pulse magnetic field excitation of a vortex weakly coupled within an array of cylindrical Permalloy discs.

Original languageEnglish
Title of host publicationQuantum Sensing and Nanophotonic Devices IV
Volume6479
DOIs
Publication statusPublished - May 24 2007
Externally publishedYes
EventQuantum Sensing and Nanophotonic Devices IV - San Jose, CA, United States
Duration: Jan 22 2007Jan 25 2007

Other

OtherQuantum Sensing and Nanophotonic Devices IV
CountryUnited States
CitySan Jose, CA
Period1/22/071/25/07

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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