Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session V22: Spin-Orbit Coupling and Antisymmetric Exchange at Metal Interfaces
2:30 PM–5:30 PM,
Thursday, March 8, 2018
LACC
Room: 402A
Sponsoring
Units:
GMAG DMP FIAP
Chair: Graham Rowlands, BBN Technology - Massachusetts
Abstract ID: BAPS.2018.MAR.V22.5
Abstract: V22.00005 : Optimizing the Spin Hall Angle in Ultrathin Metallic Films
3:18 PM–3:30 PM
Presenter:
Christian Herschbach
(Martin Luther University Halle-Wittenberg)
Authors:
Christian Herschbach
(Martin Luther University Halle-Wittenberg)
Dmitry Fedorov
(Max Planck Institute of Microstructure Physics)
Martin Gradhand
(University of Bristol)
Ingrid Mertig
(Martin Luther University Halle-Wittenberg)
The effect's strength is quantified with the so-called spin Hall angle (SHA), which is the ratio of the transverse spin conductivity to the longitudinal charge conductivity.
Reported values based on both experimental and theoretical investigations increased during the last years.
Measurements on Pt-doped Au samples yielded a SHA of about 10% introduced as giant SHE [1] while a SHA of 24% was published for thin-film Cu(Bi) alloys [2].
The large effect caused by Bi impurities in Cu was theoretically predicted for bulk samples [3].
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, 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)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.V22.5
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