Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.142: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Piezo-controlled magnetization dynamics in epitaxial NiMnSb — •Bernhard Botters1, Jan Podbielski1, Fabian Giesen1, P. Bach2, G. Schmidt2, L.W. Molenkamp2, and Dirk Grundler1 — 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Jungiusstrasse 11, 20355 Hamburg, Germany — 2Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
Semiconductor spintronics is a research field of great attraction. Here, the ferromagnetic Heusler alloy NiMnSb is an interesting material due to its high Curie temperature and its possibility to grow it on InP(001). For spintronics applications in particular the magnetization dynamics and magnetic anisotropy of NiMnSb are of fundamental interest. We present broadband ferromagnetic resonance (FMR) measurements on NiMnSb ranging from 45 MHz up to 20 GHz. In particular we glued the nm-thick epitaxial film on a piezo-electric ceramic and varied the strain of the film in a controlled manner. We observe a characteristic shift of the FMR as a function of applied voltage. From this we evaluate the dependence of the magnetic anisotropy on the relative change in lattice constant. We will report our recent results. Financial support by the BMBF via 13N8283 and 13N8284 is gratefully acknowledged.