Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.60: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Optimizing the spin Hall angle in ultrathin metallic films — •Christian Herschbach1, Dmitry Fedorov2, Martin Gradhand3, and Ingrid Mertig1,4 — 1Martin Luther University Halle-Wittenberg, Halle, Germany — 2University of Luxembourg, L-1511 Luxembourg, Luxembourg — 3University of Bristol, Bristol, United Kingdom — 4Max Planck Institute of Microstructure Physics, Halle, Germany
The spin Hall effect (SHE) is one of the key effects in modern spintronics creating pure spin currents in nonmagnetic materials. The spin Hall angle (SHA) being the ratio of the transverse spin conductivity to the longitudinal charge conductivity serves as a good quantity for the effect’s strength. During the last years, reported experimental and theoretical values of the SHA increased. While measurements on Pt-doped Au samples yielded a SHA of about 10% introduced as giant SHE [1], a SHA of 24% was published for thin-film Cu(Bi) alloys [2].
In this work we theoretically investigate Bi-doped ultrathin noble-metal films by means of an ab initio approach using density functional theory and linearized Boltzmann equation. We study various possibilities to optimize the SHE and forecast colossal SHAs slightly below 100% [4]. Furthermore, we identify systems with a strong anisotropy of the in-plane transport properties that lead to SHAs above 100%.
[1] Seki et al., Nat. Mater. 7, 125 (2008); [2] Niimi et al., Phys. Rev. Lett. 109, 156602 (2012); [3] Gradhand et al., Phys. Rev. Lett. 104, 186403 (2010); [4] Herschbach et al., Phys. Rev. B 90, 180406(R) (2014);