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Proceedings Paper

Observation of coupled magnetic vortex structure dynamics by time-resolved magneto-optical Kerr effect microscopy
Author(s): Roman Antos; Jaroslav Hamrle; Hiroaki Masaki; Takashi Kimura; Junya Shibata; Yoshichika Otani
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Paper Abstract

We report on the development of an analytical theory and a method of experimental observation of dynamic properties 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)] and 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.

Paper Details

Date Published: 2 February 2007
PDF: 13 pages
Proc. SPIE 6479, Quantum Sensing and Nanophotonic Devices IV, 647907 (2 February 2007); doi: 10.1117/12.696264
Show Author Affiliations
Roman Antos, RIKEN (Japan)
Jaroslav Hamrle, Univ. of Kaiserslautern (Germany)
Hiroaki Masaki, Univ. of Tokyo (Japan)
Takashi Kimura, Univ. of Tokyo (Japan)
Junya Shibata, RIKEN (Japan)
Yoshichika Otani, RIKEN (Japan)
Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 6479:
Quantum Sensing and Nanophotonic Devices IV
Manijeh Razeghi; Gail J. Brown, Editor(s)

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