Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Poster Session II
MA 48.46: Poster
Donnerstag, 10. März 2016, 15:00–18:00, Poster B1
Preparation and characterization of beta-W thin films for spin Hall effect experiments — •Timo Oberbiermann1, Christoph Klewe1, Jari Rodewald2, Olga Kuschel2, Joachim Wollschläger2, Günter Reiss1, and Timo Kuschel1 — 1CSMD, Physics Department, Bielefeld University, Germany — 2Fachbereich Physik, Universität Osnabrück, Germany
Recently, the spin Hall effect in metals, more precisely in Pt and β W, was detected optically by magnetooptical Kerr effect (MOKE) measurements [1]. However, the physical properties of tungsten thin films are strongly affected by the film microstructure. While the thermodynamically stable α phase exhibits no detectable spin Hall effect, the metastable β phase shows a large spin Hall angle αSH of 0.33 [2]. Hence, it is important to find appropriate conditions to prepare W films for spincaloric applications.
In this work, different W thin films were fabricated using magnetron sputtering. Process preassure, deposition time and sputtering power were varied to evaluate the ideal deposition parameters. The samples were characterized by x-ray diffraction and x-ray reflectometry to determine their structures and interface properties.
Additionally, the temporal stability of the W β phase was investigated and optical spin Hall measurements were performed, both via MOKE and x-ray resonant magnetic reflectivity (XRMR).
[1] O.M.J. Van t’Erve et al., Appl. Phys. Lett. 104, 172402 (2014)
[2] C.-F. Pai et al., Appl. Phys. Lett. 101, 122404 (2012)