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Title: Large spin hall angle enhanced by nitrogen incorporation in Pt films
Authors: Xu, Zhan
Wong, Grayson Dao Hwee
Tang, Jiaxuan
Liu, Er
Gan, Weiliang
Xu, Feng
Lew, Wen Siang
Keywords: Science::Physics
Issue Date: 2021
Source: Xu, Z., Wong, G. D. H., Tang, J., Liu, E., Gan, W., Xu, F. & Lew, W. S. (2021). Large spin hall angle enhanced by nitrogen incorporation in Pt films. Applied Physics Letters, 118(6), 062406-.
Project: I1801E0030 
Journal: Applied Physics Letters 
Abstract: We report on the enhancement of spin Hall angle from the CoFeB/Pt interface by introducing nitrogen into the Pt thin film. Spin-torque ferromagnetic resonance measurements on the effective spin Hall angle (θSH) reveal a non-monotonic variation as a function of the amount of nitrogen gas introduced, Q in the film deposition, which peaks at θSH = 0.16 when Q is 8%. Our analysis shows that the θSH enhancement is mainly attributed to the increase in spin-dependent scattering at the interface. The effective magnetic damping decreases with increasing Q due to the reduced spin-orbit coupling. The interfacial spin transparency is also observed to show improvement after the introduction of nitrogen. Moreover, the additional damping-like torque from the interface may also lead to the enhancement of the linewidth modulation.
ISSN: 0003-6951
DOI: 10.1063/5.0035815
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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