Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: POSTER Ib

MA 20.24: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Different temperature and Co thickness dependencies of the anomalous Hall and Nernst effect in Co/Pd multilayers — •Michael van Straaten, Tristan Matalla-Wagner, Daniel Meier, Jan-Michael Schmalhorst, Timo Kuschel, and Günter Reiss — CSMD, Physics Department, Bielefeld University, Germany

The Hall and Nernst effects are related due to a corresponding electrically and thermally induced transport behavior. The anomalous parts of these effects (AHE and ANE) are affected by the magnetization. Therefore, they show a hysteresis of the voltage, which is antisymmetric with respect to the external field. In perpendicularly magnetized Co/Pd multilayers the AHE has a temperature and Co thickness dependent sign change in the voltage [1].

In this work we describe an experimental setup for a simultaneous detection of transverse voltages generated by the AHE and the ANE. By applying a voltage parallel to the in-plane temperature gradient, both effects can be separated by a subsequent measurement with reversed electrical current. Two series of samples with different Co thicknesses are tested. The observed voltage changes with varying thicknesses and temperatures. The results are discussed to point out the fundamentally different behavior between the AHE and ANE in these multilayer systems.

[1] V. Keskin et al., Appl. Phys. Lett. 102, 022416 (2013)