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Vortex dynamics in Permalloy disks with artificial defects: Suppression of the gyrotropic mode

Kuepper, K. and Bischoff, L. and Akhmadaliev, Ch. and Fassbender, J. and Stoll, H. and Chou, K. W. and Puzic, A. and Fauth, K. and Dolgos, D. and Schuetz, G. and Van Waeyenberge, B. and Tyliszczak, T. and Neudecker, I. and Woltersdorf, Georg and Back, Christian H. (2007) Vortex dynamics in Permalloy disks with artificial defects: Suppression of the gyrotropic mode. Applied Physics Letters 90 (6), 062506.

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Abstract

The dynamics of magnetic vortices in thin Permalloy disks having artificial defects in the form of small holes at different locations
within the disk has been investigated by means of frequency-domain
spatially resolved ferromagnetic resonance. It is found that the vortex
can be effectively captured by such a defect. Consequently the commonly
observed gyrotropic vortex motion in an applied microwave field of 1 mT
is suppressed. However, if in addition a static magnetic field of at
least 4.3 mT is applied, the vortex core is nucleated from the
artificial defect and a modified gyrotropic motion starts again. (c)
2007 American Institute of Physics.

Item Type:

Article

Institutions:

Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Christian Back

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