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 20.80: Poster

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

Spin Dynamics of Quadratic Ni₈₀Fe₂₀ Thin Film Elements: Experiment and Simulation — •Korbinian Perzlmaier¹, Matthias Buess^1,2, 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