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TT: Fachverband Tiefe Temperaturen
TT 14: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)
TT 14.11: Vortrag
Dienstag, 18. März 2025, 12:15–12:30, H18
Large Spin Hall Angle in Mn-based Antiferromagnetic Alloys — •Nabil Menai1, Martin Gradhand2, and Derek Stewart3 — 1H. H. Wills Physics Laboratory, University of Bristol, Tyndall Ave, BS8-1TL, UK — 2Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany — 3Western Digital Research Center, San Jose, California 95119, USA
Antiferromagnets (AFMs) have emerged as crucial materials for spintronic technologies for their ability to host spin-dependent transport phenomena, despite their zero net magnetization. Their robustness against external magnetic fields and ultrafast spin dynamics make them ideal for efficient spin-charge interconversion. In this theoretical study, we use density functional theory and Greens function methods to investigate the transport properties of Mn-based binary alloyed AFMs. Our focus is on the total spin Hall conductivity (SHC), accounting for both the intrinsic contributions from Berry curvature and the extrinsic effects from skew scattering and side-jump mechanisms. The objective is to identify AFM materials that exhibits a high spin Hall angle (SHA); with an efficient charge-to-spin Hall current conversion ratio. Our results reveal that doping MnPt with Ir significantly enhances the SHA, achieving a value of 8% at room temperature. In contrast, doping with Pd offers temperature stability with lower SHA values. Additionally, we examine the effects of substituting Mn atoms with magnetic transition metals such as Fe and Ni. These findings underscore the potential of antiferromagnetic alloys for efficient spin current generation.
Keywords: Spintronics; Spin Hall effect; spin Hall angle; Density functional theory; Green's function method