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MA: Fachverband Magnetismus

MA 46: Spin: Transport, Orbitronics and Hall Effects I

MA 46.9: Vortrag

Donnerstag, 19. März 2020, 11:45–12:00, HSZ 403

Stoner instability investigated by XRMR and XMCD — •Dominik Graulich¹, Jan Krieft¹, Anastasiia Moskaltsova¹, Tobias Peters¹, Johannes Demir¹, Jan Schmalhorst¹, Jose R. Linares Mardegan², Sonia Francoual², Padraic Shafer³, Christoph Klewe³, and Timo Kuschel¹ — ¹Center for Spineletronic Materials and Devices, Bielefeld University, Germany — ²Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — ³Advanced Light Source, LBNL, Berkeley, USA

X-ray resonant magnetic reflectivity (XRMR), in combination with x-ray magnetic circular dichroism, is a very sensitive technique to detect the proximity-induced spin polarization in heterostructures of heavy metals (HMs) in contact to ferromagnetic (FM) materials. This magnetic proximity effect (MPE), caused by the closeness of the HM to the FM instability within the Stoner description, was extensively studied for Pt within the hard x-ray range. Here, a linear dependence between the strength of the MPE, up to 0.7 µ_B per Pt atom, and the magnetic moment of the FM material, as well as a typical effective magnetic Pt thickness of around 1.2 nm were found. With the expansion of the XRMR analysis into the tender and soft x-ray range, the strength and magnetic depth profiles of further materials close to the FM instability (as, e.g., Pd, V, ...) have been investigated at the beamlines P09 (DESY) and 4.0.2 (ALS). This knowledge is crucial for the application of these materials in spintronic devices, where spin transport effects can be altered due to the additional magnetization of the nominal paramagnetic HM layer.