Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 56: Spin-Hall effects
MA 56.7: Vortrag
Freitag, 16. März 2018, 11:00–11:15, H 0112
Thicknesses effect of MnGa and Pt on current-induced switching spin orbit torque (SOT) in CoGa/L10 MnGa/(CoGa)/Pt structure with perpendicular magnetic anisotropy (PMA) — •Reza Ranjbar1,2, Kazuya Suzuki1, and Shigemi Mizukami1 — 1WPI-Advanced Institute for Materials Research, Tohoku University, Sendai, Japan — 2Current affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
The use of SOT has attracted much attention as one of the ways to electrically manipulate the magnetization of magnetic thin films by applying an electrical current [1]. Tetragonal Heusler-like MnGa alloy have very low net-magnetic moments, high PMA, low Gilbert damping, and high spin polarization. Recently, we discovered low-temperature method of chemically growing 1–3-nm-thick MnGa films on B2 ordered CoGa [2]. This enabled us to investigate the SOT in MnGa alloy and then we reported current-induced SOT magnetization switching in CoGa/MnGa/Pt and CoGa/MnGa/MgO films [3,4]. Here, we present the results of our study on current-induced SOT switching in perpendicularly magnetized CoGa/MnGa/Pt trilayers with different thicknesses of MnGa and Pt. We found that the SOT switching is primarily due to the spin-Hall effect. The effect of MnGa (Pt) thickness is discussed in terms of the magnetic properties (resistivity).
[1] I. M. Miron et al., Nature 476 (2011) 189. [2] K. Z. Suzuki et al., Jpn. J. Appl. Phys. 55 (2016) 010305(R). [3] R. Ranjbar et al., Jpn. J. Appl. Phys. 55 (2016) 120302(R). [4] M. Takikawa et al., Appl. Phys. Express 10 (2017) 073004.