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 20.49: Poster

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

Distribution of spin-polarized current in magnetic nanoconstrictions with noncollinear Magnetization — •O. Vedmedenko¹, E.Y. Vedmedenko², and D. Pfannkuche¹ — ¹ITP, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg — ²IAP, Universität Hamburg, Jungiusstr. 11c, 20355 Hamburg

The magnetoresistivity of a nanomagnet depends on both the shape of the sample and the configuration of magnetic moments. Especially important for transport properties is the magnetic ordering in the area of a domain wall. Depending on the energy of electrons and the width of a wall the polarized charge transfer can be either adiabatic or non-adiabatic. In adiabatic process the spin of a conducting electron changes its orientation accordinly to the magnetization profile of a domain wall. In the non-adiabatic case spins of the charge carriers are not able to follow the wall magnetization and the total magnetization of conducting electrons reverses. This can lead to the displacement of the domain wall. Knowledge of spin-polarized current distribution is often needed as initial configuration for further investigations on the magnetoresistance and current-assisted domain-wall propagation. We calculate numerically spin-polarized current distributions in nanoconstrictions of different shape for different material parameters in the adiabatic and the non-adiabatic approximation. Stable low-temperature magnetic configurations for the computations are taken from the Monte-Carlo simulations.