Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 37: Spin Dependent Transport Phenomena

MA 37.9: Vortrag

Donnerstag, 26. März 2009, 17:15–17:30, HSZ 403

Magnetoresistance effects of Co/Pt layered structures — •André Kobs, Simon Heße, and Hans Peter Oepen — Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany

We have investigated the current in plane (CIP) magnetoresistance (MR) of Co/Pt single and multilayers at room temperature. In case of multilayers with 4 fold repetition, the Pt interlayer thickness has been varied from 1 nm to 10 nm with a fixed Co thickness of 0.7 nm (perpendicular magnetization). In case of single layers, the Co thickness has been varied between 0.5 nm (perpendicular magnetization) and 5 nm (in plane magnetization). The MR of the samples has been measured in three different geometries, with the magnetic field applied in plane parallel and perpendicular to the current direction, respectively, as well as perpendicular to the film plane (out of plane geometry). In all geometries the anomalous Hall effect (AHE), which is sensitive to the perpendicular component of magnetization, has been measured simultaneously. In contradiction to the anisotropic MR (AMR) of bulk materials we find, that the perpendicular in plane saturation resistance is significantly smaller than the perpendicular out of plane resistance. For Co single layers the opposite effect was found [1]. In case of samples with perpendicular magnetization, antisymmetric peaks at the fields of magnetization reversal occur [2].

[1] W. Gil et al., Phys. Rev. B 72, 134401, (2005)

[2] X. M. Cheng et al., Phys. Rev. Lett. 94, 017203 (2005)