Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.63: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Interplay of magnetization, heat and charge currents in FeCo thin films in the presence of magnetic field — •Sasmita Srichandan, Matthias Kronseder, Christian Back, Josef Zweck, and Christoph Strunk — Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany
We present the magneto thermoelectric response to currents in 20 nm thick FexCo1−x films with compositions x= 0.3, 0.5, 0.6, 0.7, 0.8 deposited on 100 nm thick SiNx membranes. The anisotropic magnetoresistance (AMR) has contributions from both coherent rotation of magnetization and domain switching. The angular dependence of the switching field Hsw at room temperature has a minimum at 20∘. The shift of this minimum to 20∘ from 45∘ as predicted by the Stoner-Wohlfarth model owes to the aspect ratio of our FM strip, which causes inhomogeneous demagnetization fields at the ends of the strip. On the same films, features of Hsw in magneto thermopower (MTEP) measured in temperature gradients ∇→T of up to 250 K/mm are similar to those in the AMR. Additionally the membranes allow measurement of all 4 transport coefficients on the same film. 20 nm FexCo1−x films were also deposited on very thin 30 nm SiNx membranes to study the effects of charge current and ∇→T on domain walls in TEM. The Lorentz microscopy images show two domain walls nucleated at both ends of the FM strip and via the microscopy we demonstrate the response to applied field and temperature gradient.