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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 20.64: Poster

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

LLG-simulations of FM/AFM multilayers — •Björn Beckmann¹, Ulrich Nowak², and Klaus D. Usadel¹ — ¹Fachbereich Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany — ²Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom

Magnetization dynamics has become an object of intense studies in recent years. In particular, for achieving high speed magnetization switching, e. g. for magnetic random access memory devices, it is extremely important to know the Gilbert damping constant and, moreover, to know how to influence this constant. One approach is to use FM/AFM multilayers. Even though numerous works have dealt with such systems a fundamental knowledge of the underlying microscopic mechanism is still lacking.

Therefore, in our contribution we present results from numerical simulations of FM/AFM multilayers. The system investigated consists of an FM monolayer exchange coupled to several AFM layers. We included nearest neighbor exchange interaction, in-plain/out-of-plain anisotropies, the long range dipole-dipole interaction and the coupling to an external field. The dynamics is described by LLG equations at finite temperatures which are solved numerically.

A main result of our simulations is that the FM damping is greatly enhanced just by adding a single AFM layer, but a further increase of the AFM layer thickness has no considerable effect on the FM damping.

This work was supported by the Deutsche Forschungsgemeinschaft through SFB 491.