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MA: Fachverband Magnetismus

MA 35: Magnetization / Demagnetization Dynamics II

MA 35.8: Talk

Wednesday, March 18, 2015, 17:00–17:15, EB 301

Ultrafast Spin dynamics in tunnel-magneto resistance junctions — •Jakob Walowski¹, Marvin von der Ehe¹, Ulrike Martens¹, Vladyslav Zbarsky^1,2, Markus Münzenberg¹, Andy Thomas³, Jia Zhang⁴, Christian Franz⁴, Michael Czerner⁴, and Christain Heiliger⁴ — ¹Institut für Physik, Ernst-Moritz-Arndt Universität, Greifswald, Germany — ²Fakultät für Physik, Georg-August Universität, Göttingen, Germany — ³CSMD, Physics Department, Bielefeld University, Germany — ⁴I. Physikalisches Institut, Justus Liebig Universität, Gießen

We investigate the spin transport and ultrafast spin dynamics in the magnetic layers of tunnel-magneto resistance junctions (MTJs) with out-of-plane magnetic anisotropy PMA. Both effects are induced by the excitation of the electron and spin system by ultra-short laser pulses.

The processes causing the spin dynamics and the spin transport depend on the properties of the magnetic electrodes and the tunnel barrier. Therefore the thickness of the CoFeB electrodes is varied within the range of permendicular magnetic anisotropy from 0.9 nm up to 1.3 nm. By studying the ultrafast dynamics, we disentangle the mechanisms and processes causing spin transfer between the electrodes through the tunnel barrier on femtosecond time scales.

Financial funding by the DFG SPP 1538 SpinCaT is acknowledged.