Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 34: Topological Insulators (jointly with DS, HL, O, TT)
MA 34.3: Talk
Wednesday, March 9, 2016, 15:30–15:45, H32
Transport measurements on ferromagnet / Half Heusler TI bilayer structures — •Benedikt Ernst1, Robin Klett2, Jan Haskenhoff2, James Taylor3, Yong Pu3, Günter Reiss2, Stuard S. P. Parkin3, and Claudia Felser1 — 1Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden — 2Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld — 3Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle
Heusler compounds exhibit a manifold of physical properties and attracted in the recent past a lot of interest in the field of spintronic applications due to their half-metallic properties.
In the present work bilayer systems of ferromagnetic materials and half Heusler topological insulators (TI) are studied. The systems were deposited using DC- and RF magnetron co-sputtering. The samples were characterized by X-ray diffraction and electron microscopy techniques. On fabricated devices, the transport properties and spin properties were studied by different measurement techniques including ST-FMR and spin injection experiments.
Additional measurements of the unidirectional spin Hall magnetoresistance were realized. In this effect, we measure a change in the magnetoresistance depending on the direction of the magnetization, which is proportional to the spin Hall angle. We varied the combination of different ferromagnetic materials with different Tis of the YPtBi, YPdBi, LaPtBi and LaPdBi system, and the thicknesses of the layers, to investigate the effects on the transport properties.