Vortex dynamics in permalloy disks with artificially point defects: Suppression of the gyrotropic mode

Kuepper, K.; Bischoff, L.; Akhmadaliev, Ch; Fassbender, J.; Stoll, H.; Chou, K. W.; Puzic, A.; Fauth, K.; Dolgos, D.; Schütz, G.; Waeyenberge, B. van; Tyliszczak, T.; Neudecker, I.; Woltersdorf, G.; Back, C. H.

doi:10.1063/1.2437710

Vortex dynamics in permalloy disks with artificially point defects: Suppression of the gyrotropic mode

Kuepper, K.; Bischoff, L.; Akhmadaliev, C.; Fassbender, J.; Stoll, H.; Chou, K. W.; Puzic, A.; Fauth, K.; Dolgos, D.; Schütz, G.; van Waeyenberge, B.; Tyliszczak, T.; Neudecker, I.; Woltersdorf, G.; Back, C. H.

The dynamics of magnetic vortices in thin permalloy disks comprising artificial point defects at
different locations within the disk has been investigated by means of frequency-domain spatially
resolved ferromagnetic resonance. It is found that the vortex core can be effectively trapped by
a point 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 unpinned from the artificial point defect and a modified gyrotropic
motion starts again.

Keywords: PACS numbers: 75.75.+a; 75.40.Gb; 75.50.Bb; 05.45.Yv

Applied Physics Letters 90(2007)5, 062506
DOI: 10.1063/1.2437710
Cited 35 times in Scopus

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