Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 56: Spin-Hall effects

MA 56.6: Talk

Friday, March 16, 2018, 10:45–11:00, H 0112

Unidirectional spin Hall magnetoresistance in highly spin polarized Heusler compound Co₂MnSi — •Christian Lidig, Laura Weißhoff, Stanislav Bodnar, Mathias Kläui, and Martin Jourdan — Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany

The unidirectional spin Hall magnetoresistance (USMR) effect was recently experimentally observed [1] and theoretical described [2] in heavy metal/ ferromagnetic metal bilayer systems. This effect can be used to probe the magnetic state at the interface between the ferromagnet and heavy metal and it scales, similar to the giant magnetoresistance effect, with the spin polarization of the ferromagnet [2]. Correspondingly highly spin polarized materials, for example half metallic materials, should yield to larger effects. Previous photoemission experiments proved the half metallicity of Co₂MnSi (CMS) and showed a high spin polarization (93%) for a free surface of CMS [3]. However, it is not clear how the high surface spin polarization effects the spin transport measurements. Here I will present spin hall magnetoresistance measurements on CMS / Pt bilayer structures showing a large unidirectional spin hall magnetoresistance effect, originating from the high spin polarization of CMS. [1] C.O. Avci et al., Nat Phys. 11, 570 (2015). [2] S.S.-L. Zhang et al., Phys Rev B, 94,140411 (R) (2016). [3] M. Jourdan et al., Nat. Commun. 5, 3974 (2014).