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 20.77: Poster

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

Pulsed inductive measurement of large angle precession in magnetic thin films — •Tobias Martin, Ingo Neudecker, Björn Becker, Matthias Sperl, and Günther Bayreuther — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg

To further increase writing speeds in magnetic storage devices it has been proposed to use precessional switching of the magnetization. To understand this switching behaviour, it is important to understand the time-domain motion of the magnetization after the excitation with large pulse amplitudes. Here Permalloy as well as epitaxial FeCo films are investigated in the large angle regime with the PIMM (pulsed inductive microwave magnetometer). The epitaxial films are examined in hard axis direction near the anisotropy field to reduce the internal effective field and thus achieve large precession angles. The observed variation of the precessional amplitude with increasing pulse field can not be explained within the linear theory. On the other hand, it is shown that the experimental data are well described by a numerical simulation based on a macrospin model.

In fully epitaxial magnetic double layer films two separate precession frequencies are resolved by PIMM. The data are analysed in order to identify the interlayer coupling between both layers.

This work is supported by the Deutsche Forschungsgemeinschaft (SPP1133).