Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.7: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Micromagnetic properties of MnAs films on GaAs (001) studied by variable temperature and field MFM — •Jyoti Mohanty, Thorsten Hesjedal, Lutz Däweritz, and Klaus H. Ploog — Paul Drude Institute, Hausvogteiplatz 5-7, 10117 Berlin, Germany

MnAs on GaAs(001) is a hybrid ferromagnet-semiconductor system that shows a first order magneto-structural phase transition that proceeds via a continuous variation of the phase ratio over a temperature range of 10-40^∘C. The coexisting phases, namely hexagonal, ferromagnetic α-MnAs and orthorhombic, paramagnetic β-MnAs form a periodic stripe structure, oriented along the MnAs[0001] direction. The system exhibits a strong in-plane uniaxial anisotropy. Magnetic force microscopy (MFM) images show a variety of domain configurations in the demagnetized state of the film. The domain structures and their dependence on the ferromagnetic stripe width (temperature dependence), stripe period (film thickness), and inter-stripe coupling distance were studied. Employing an external field, further insight into the coupling between the stripes and the magnetization reversal process was gained.