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Title: Enhanced spin Hall conductivity in tungsten-copper alloys
Authors: Coester, Birte
Wong, Grayson Dao Hwee
Xu, Zhan
Tang, Jiaxuan
Gan, Weiliang
Lew, Wen Siang
Keywords: Science::Physics
Issue Date: 2021
Source: Coester, B., Wong, G. D. H., Xu, Z., Tang, J., Gan, W. & Lew, W. S. (2021). Enhanced spin Hall conductivity in tungsten-copper alloys. Journal of Magnetism and Magnetic Materials, 523, 167545-.
Project: NRF-CRP9-2011- 01
NRF2015- IIP001- 001
Journal: Journal of Magnetism and Magnetic Materials
Abstract: We report on the enhancement of the spin Hall conductivity in tungsten by alloying with copper, measured by using the spin-torque ferromagnetic resonance technique. The alloying leads to an increase in spin-dependent scattering events and results in an enhancement of the contributing extrinsic spin Hall effects. The measured damping property shows a slight increase with higher tungsten concentration, due to spin current losses from the ferromagnetic layer into the tungsten-copper alloy. At a tungsten concentration of 60%, the spin Hall conductivity reaches a maximum of 3.68±0.68×105Ω-1m-1, corresponding to an enhancement of 120% compared to the pure tungsten sample. At the same concentration, the ratio of the spin Hall angle to the damping of the ferromagnetic layer, which offers a quick estimation for the critical switching current density, is found to be four times smaller as compared to pure tungsten.
ISSN: 0304-8853
DOI: 10.1016/j.jmmm.2020.167545
Schools: School of Physical and Mathematical Sciences 
Organisations: GlobalFoundries Singapore Pte Ltd
Rights: © 2020 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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