Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.69: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Kerr microscopical investigations of domain wall dynamics in ultrathin trilayers of Pt/Co/Pt — •Jan Rhensius1, Theo Kleinefeld1, Wolfgang Kleemann1, Jacques Ferré2, Jean-Pierre Jamet2, and Harry Bernas3 — 1Angewandte Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany — 2LPS, Université Paris-Sud, 91405 Orsay, France — 3CSNSM, Université Paris-Sud, 91405 Orsay, France
The dynamics of ferromagnetic domain walls in ultrathin trilayers Pt/Co(0.5 nm)/Pt with perpendicular anisotropy is investigated by polar Kerr microscopy. The coercive field has been reduced to a few mT by irradiation with a dose of 1.5x1016cm−2 He+ ions at 30 keV energy [1]. Magnetization reversal processes are recorded with a temporal resolution of about 0.8 s. Field-induced domain growth and domain wall velocities are analyzed by treating the differences of subsequent images. Apart from the dependence of the velocity on a perpendicularly applied static magnetic field, the change of wall conformations and their average velocities are also determined in sinusoidally modulated external fields. The results are related to linear magnetic ac susceptibility spectra being excited under similar conditions [2]. They help understanding the role of the different dynamic domain wall modes - creep, slide and switching - observed in disordered ferroic materials [3]. [1] C. Chappert, H. Bernas, J. Ferré et al., Science 280, 1919 (1998). [2] O. Petracic, A. Glatz, W. Kleemann, Phys. Rev. B 70, 214432 (2004). [3] W. Kleemann, Ann. Rev. Mat. Res. 37 (2007) in press.