Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.6: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
Magnetic aftereffect in compressively strained GaMnAs resolved by Kerr microscopy — •Liza Herrera Diez1, Jan Honolka1, Klaus Kern1, Helmut Kronmüller2, Ernesto Placidi3, Fabrizio Arciprete3, Andrew Rushforth4, Richard Campion4, and Bryan Gallagher4 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — 2Max-Planck-Institut für Metallforschung, Stuttgart — 3Dipartimento di Fisica, Università di Roma "Tor Vergata" — 4School of Physics and Astronomy, University of Nottingham
The correlation between carrier density and magnetic properties like Tc [1] or the magnetic anisotropy [2] in GaMnAs enables the tuning of magneto-transport properties and opens new ways for magneto-logic devices[3]. However, a full control over magnetic reversal dynamics mediated via nucleation and propagation of domain walls (DWs) is required. While magneto-transport measurements like e.g. the planar Hall effect only give spatially averaged information about DW dynamics we use Kerr microscopy to track individual in-plane domains in space and time[4]. In this work we specifically address the influence of the magnetic aftereffect on the dynamics.
References
[1] T.Dietl et al., Science 287, 1019 (2000). [2] T.Dietl, H.Ohno, and F.Matsukura, Phys. Rev. B 63, 195205 (2001). [3] D.Chiba, M.Yamanouchi, F.Matsukura, H.Ohno, Science 301, 943 (2003). [4] L. Herrera Diez et al., Phys. Rev. B 78, 155310 (2008).