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.
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8 February 2021
Research Article|
February 10 2021
Large spin Hall angle enhanced by nitrogen incorporation in Pt films Available to Purchase
Special Collection:
Spin-Orbit Torque (SOT): Materials, Physics, and Devices
Zhan Xu
;
Zhan Xu
1
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore 637371, Singapore
2
MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
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Grayson Dao Hwee Wong
;
Grayson Dao Hwee Wong
1
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore 637371, Singapore
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Jiaxuan Tang;
Jiaxuan Tang
2
MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
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Er Liu
;
Er Liu
2
MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
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Weiliang Gan
;
Weiliang Gan
1
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore 637371, Singapore
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Feng Xu
;
Feng Xu
a)
2
MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
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Wen Siang Lew
Wen Siang Lew
a)
1
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore 637371, Singapore
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Zhan Xu
1,2
Grayson Dao Hwee Wong
1
Jiaxuan Tang
2
Weiliang Gan
1
Feng Xu
2,a)
Wen Siang Lew
1,a)
1
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore 637371, Singapore
2
MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology
, Nanjing 210094, China
Note: This paper is part of the Special Topic on Spin-Orbit Torque (SOT): Materials, Physics and Devices.
Appl. Phys. Lett. 118, 062406 (2021)
Article history
Received:
October 31 2020
Accepted:
January 30 2021
Citation
Zhan Xu, Grayson Dao Hwee Wong, Jiaxuan Tang, Er Liu, Weiliang Gan, Feng Xu, Wen Siang Lew; Large spin Hall angle enhanced by nitrogen incorporation in Pt films. Appl. Phys. Lett. 8 February 2021; 118 (6): 062406. https://doi.org/10.1063/5.0035815
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