Dresden 2006 – scientific programme

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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 20.94: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Imaging the non uniform excitations of the ferromagnetic resonance of Cobalt and Permalloy structures using scanning near field thermal microscopy — •R. Meckenstock¹, I. Barsukov¹, O. Posth², C. Hassel², J. Lindner², G. Dumpich², M. Farle², J. Podbielski³, D. Grundler³, D. Dietzel⁴, and D. Spoddig¹ — ¹Institut für Experimentalphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — ²Fachbereich Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany — ³Institut für Angewandte Physik, Universität Hamburg, 20355 Hamburg, Germany — ⁴Physikalisches Institut, Universität Münster, 48149 Münster, Germany

Near field thermal microscopy has been applied on the analysis of the magnetic properties of Co stripe arrays and Permalloy (Py) ring arrays on GaAs. The samples were prepared using the standard lithography lift off processes. The Co stripes were 50µm long and 10µm apart. The stripe width was between 0.6 and 2µnm and the thickness between 10 and 30nm. The Py rings had an inner diameter of 0.8µm and an outer of 2µm, and a thickness of 15 nm. The conventional ferromagnetic resonance (FMR) measurements show additional FMR modes as function of Co thickness if the external field was applied perpendicular to the stripes. The origin of these modes was then deduced locally resolved in the single structures using a scanning thermal microscope (SThM), which features a lateral resolution of 100nm. The modes could be correlated by SThM-FMR to different excitation states in the Co stripe. The Py ring exhibits in the conventional FMR experiment one resonance line, which could be linked to the thermal excitation of parts of the ring by SThM-FMR.