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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 20.76: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Kerr domain imaging of microwave assisted switching — •P. Martin Pimentel, H.T. Nembach, S. Hermsdörfer, and B. Hillebrands — Fachbereich Physik and Forschungsschwerpunkt MINAS, TU Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern, Germany

We present Kerr microscopy studies of the quasi-static switching behavior of a micropattened Ni₈₁Fe₁₉ ellipsoid under the influence of a microwave field. The microwave field is applied perpendicular to the quasi-static magnetic field, which is oriented parallel to the long axis of the ellipsoid. The long axis of the ellipsoid is 160 µm and the short is 80 µm, with a thickness of 10 nm. The frequency of the microwave field is 800 MHz and the microwave power is 5 dBm and 35 dBm, respectively. A strong modification of the reversal process of the magnetization behavior is observed. For low power big domains are observed orientated parallel to the quasi-static applied field in the range from 6 Oe to 9 Oe. In contrast, for high microwave power, formation of ripples is observed during the magnetization reversal taking place in the field range from 1 Oe to 4 Oe. These two different behaviors can be described by modification of the domain nucleation and growth process due to the microwave field. We show that the applied transversal microwave field can stimulate the domain nucleation and propagation process in a confined element. This work is supported by the EU-RTN ULTRASWITCH (HPRN-CT-2002-00318).