Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 29: Spin dependent Transport Phenomena
MA 29.2: Vortrag
Dienstag, 21. März 2017, 14:15–14:30, HSZ 403
Planar Hall effect in Au/Fe/MgO (001) heterostructures for spin-orbitronics — •Pika Gospodaric1, Ewa Mlynczak1, Daniel E. Bürgler1, Frank Volmer2, Bernd Beschoten2, Lukasz Plucinski1, and Claus M. Schneider1 — 1Peter Grünberg Institut PGI-6, Forschungszentrum Jülich, 52425 Jülich, Germany — 22nd Institute of Physics and JARA-FIT, RWTH Aachen University, 52074 Aachen, Germany
The combined effects of the spin-orbit coupling (SOC) and the exchange interaction can generate torques acting on the magnetization of a ferromagnet. Strong SOC can be achieved in a ferromagnetic metal (FMM) by close proximity to a heavy metal (HM). Recently, it was shown that by applying a current in the plane of a FMM, sandwiched between a HM and an oxide layer, the magnetization of the FMM layer can be manipulated. This phenomenon is now known as the spin-orbit torque (SOT) and is explained either on the basis of the Rashba field present at the interface of the layers or a strong spin Hall effect in the HM layer. In this contribution we present the observation of changes of the magnetization direction of a prototypical FMM, namely an Fe (001) thin film in epitaxially grown Au/Fe/MgO (001) heterostructures. We identified a four-fold in-plane magnetic anisotropy of the Fe (001) layer with magneto-transport measurements and detected changes of the magnetization direction using the planar Hall effect. Above a critical current threshold of 2 x 107 A/cm2 we measured an increase of the induced Hall voltage, which we attribute to a SOT-induced tilt of the magnetization direction of the Fe (001) layer.