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 20.80: Poster
Tuesday, March 28, 2006, 15:15–19:15, P1
Spin Dynamics of Quadratic Ni80Fe20 Thin Film Elements: Experiment and Simulation — •Korbinian Perzlmaier1, Matthias Buess1,2, Rainer Höllinger1, Michael R. Scheinfein3, and Christian H. Back1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstr. 31, 93040 Regensburg, Germany — 2Paul Scherrer Institut, 5232 Villigen PSI, Switzerland — 3Simon Fraser University, 8888 University Drive, V5A 1S6 Burnaby BC, Canada
We examine the magnetization dynamics of quadratic Ni80Fe20 thin film elements upon external magnetic excitation. Results from experiments using Time Resolved Scanning Kerr Microscopy (TRSKEM) and Micro Focus Brillouin Light Scattering (µBLS)[1] are compared to simulations using the LLG Micromagnetics Simulator [2]. While experiment and simulation show good agreement, simulations themselves offer further insights into the dynamic behavior in regimes which are not yet easily accessible to experimental investigation: Evaluating Fourier spectra of simulations at different points in time, one can find some modes that just decay exponentially. However, other modes will decrease in their amplitude and then gain amplitude again, showing strong signs for a mechanism of exchange mediated mode conversion on a time scale of several nanoseconds.
[1] Phys. Rev. Lett. 94, 057202 (2005)
[2] http://llgmicro.home.mindspring.com