Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Heusler Compounds, Semimetals and Oxides (joint session MA/TT)
TT 10.5: Vortrag
Montag, 12. März 2018, 10:30–10:45, EB 301
Symmetry and magnitude of intrinsic spin-orbit torques in the half-Heusler alloy PtMnSb — •Johannes Mendil1, Jan Krieft2, Phuong Dao1, Can Onur Avci1, Myriam Haydee Aguirre3, Karsten Rott2, Jan-Michael Schmalhorst2, Frank Freimuth4, Günter Reiss2, Timo Kuschel2, and Pietro Gambardella1 — 1Department of Materials, ETH Zürich — 2CSMD, Department of Physics, Bielefeld University — 3Universidad de Zaragoza — 4Peter Grünberg Institut, FZ Jülich
Magnetization manipulation by spin-orbit torques (SOTs) has advanced to an active research field over the past few years and is mostly focused on conventional ferromagnets deposited on heavy metal layers where the space inversion symmetry is broken at the interface[1]. However, space inversion symmetry is intrinsically broken in non-centrosymmetric crystals [2]. We present the first observation of intrinsic SOTs in PtMnSb single layers, which is a magnetic half-Heusler alloy. It was prepared by co-sputtering [3]. Using crystallographic symmetry, we separate the observed SOTs in odd and even components with respect to magnetization inversion. We reveal corresponding effective fields that scale up to the 2nd and 3rd power of magnetization components with a distinct symmetry compared to standard field-like and damping-like SOTs. Finally, we characterize the SOTs as a function of PtMnSb thickness and discuss the possibility of using PtMnSb for magnetic switching applications. [1] Garello et al., Nat. Nanotech. 8, 587 (2013) [2] Ciccarelli et al., Nat. Phys. 12, 855 (2016) [3] Krieft, Mendil et al., Phys. Stat. Sol. (RRL) 11, 1600439 (2017)