Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 16: Magnetization and Demagnetization Dynamics I
MA 16.11: Talk
Tuesday, March 8, 2016, 12:15–12:30, H34
Magnetization dynamics and spin transport in magnetic-tunnel-junctions — •Jakob Walowski1, Ulrike Martens1, Christian Denker1, Robin John1, Alexander Böhnke3, Günter Reiss3, Vladyslav Zbarsky1,2, and Markus Münzenberg1 — 1Institut für Physik, Ernst-Moritz-Arndt Universität, Greifswald, Germany — 2Fakultät für Physik, Georg-August Universität, Göttingen, Germany — 3CSMD, Physics Department, Bielefeld University, Germany
We apply ultra short laser pulses to initiate magnetization dynamics and spin-transport in magnetic layers of tunnel-magneto resistance junctions (MTJs) with out-of-plane magnetic anisotropy (PMA). The systems consist of ferromagnetic electodes (FM) separated by an insulator layers FM/MgO/FM. Both processes are induced by the absorption of photons into the electron and spin system.
Probing the dynamics using both components of the time-resolved magneto-optical kerr-effect, the Kerr rotation and Kerr ellipticity, the samples can be probed at different depths[1]. We do the measurements on a wedge sample, where the thickness of the FM electrodes is varied within the range of perpendicular magnetic anisotropy. This enables the insight into the processes in the layers stemming from spin-flip scattering and from spin-polarized transport. Both, spin dynamics and spin transport depend on the properties of the magnetic electrodes and the tunnel barrier.
Financial funding by the DFG SPP 1538 SpinCaT is acknowledged. 1PRB J. Wieczorek et al., 92, 174410 (2015)