Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Transport: Nanoelectronics II - Spintronics and Magnetotransport

TT 37.6: Vortrag

Donnerstag, 26. März 2009, 10:45–11:00, HSZ 105

Anomalous Hall effect in granular ferromagnetic metals and effects of weak localization — •Hendrik Meier, Maxim Kharitonov, and Konstantin Efetov — Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44780 Bochum

We theoretically investigate the anomalous Hall effect in a system of dense-packed ferromagnetic grains in the metallic regime. Using the formalism recently developed for the conventional Hall effect in granular metals, we calculate the residual anomalous Hall conductivity σ_xy and resistivity ρ_xy and weak localization corrections to them for both skew-scattering and side-jump mechanisms. We find that, unlike for homogeneously disordered metals, the scaling relation between ρ_xy and the longitudinal resistivity ρ_xx does not hold. The weak localization corrections, however, are found to be in agreement with those for homogeneous metals.