Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.21: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Phase-sensitive Detection of Inverse Spin-Orbit Torques in Normal Metal/Ferromagnet Bilayers at GHz-Frequencies — •Lukas Liensberger1,2, Satya Prakash Bommanaboyena3, Björn Gliniors3, Oliver Gückstock4, Tom Seifert4, Tobias Kampfrath4, Rudolf Gross1,2,5, Markus Meinert3, and Mathias Weiler1,2 — 1Walther-Meißner-Institut, Garching — 2Physik-Department, Technische Universität München, Garching — 3Center for Spinelectronic Materials and Devices, Department of Physics, Bielefeld University, Bielefeld — 4Department of Physical Chemistry, Fritz Haber Institut of the Max Planck Society, Berlin — 5Nanosystems Initiative Munich, Munich
Quantitative understanding of direct and inverse spin-orbit torques (SOT) in ferromagnet/normal metal bilayers is required to develop novel and efficient spintronic devices. Established methods to quantify SOTs require patterning and/or impedance matching. Here, we use a novel, contactless inductive measurement technique to quantify the SOTs in different normal metal/ferromagnet bilayer systems at room temperature and microwave frequencies using a coplanar waveguide (CPW) and a vector network analyzer [1]. This method is based on the broadband ferromagnetic resonance technique and utilizes that the CPW detects any source of AC magnetic flux. The phase-sensitive method can distinguish between field- and damping-like SOTs. We study SOTs in thin film bilayers consisting of the ferromagnet CoFeB and varying binary alloys of TaAu and AuPt as well as W with varied degree of oxidation. [1] A. Berger et al., arXiv: 1611.05798 (2016)