Spin–orbit torque (SOT) induced magnetization switching and SOT modulation by interfacial coupling exhibit good potential in spintronic devices. In this work, we report the enhancement of damping-like field and SOT efficiency of up to 60% and 23%, respectively, in perpendicularly magnetized Pt/Co/HfOx heterostructures over a Pt/Co system at an optimal thickness of 2 nm HfOx. The SOT improvement is primarily attributed to the interfacial oxidization of the Co layer, and the strength is tunable via voltage-induced oxygen ion migration at the Co/HfOx interface. Our measurement reveals that by controlling gate voltages, the Co oxidation can be increased, which leads to the SOT efficiency enhancement. Our work promotes the SOT enhancement and modulation by oxidation effects for energy-efficient spintronic devices.
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20 March 2023
Research Article|
March 20 2023
Enhancement of spin–orbit torque in Pt/Co/HfOx heterostructures with voltage-controlled oxygen ion migration
Special Collection:
Magneto-ionic and electrostatic gating of magnetism: Phenomena and devices
S. Wu
;
S. Wu
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Writing – original draft, Writing – review & editing)
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore
637371
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T. L. Jin
;
T. L. Jin
(Conceptualization, Formal analysis, Investigation, Writing – review & editing)
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore
637371
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F. N. Tan
;
F. N. Tan
(Formal analysis, Software)
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore
637371
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C. C. I. Ang
;
C. C. I. Ang
(Writing – review & editing)
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore
637371
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H. Y. Poh
;
H. Y. Poh
(Methodology)
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore
637371
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G. J. Lim
;
G. J. Lim
(Writing – review & editing)
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore
637371
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W. S. Lew
W. S. Lew
a)
(Funding acquisition, Supervision, Writing – review & editing)
School of Physical and Mathematical Sciences, Nanyang Technological University
, 21 Nanyang Link, Singapore
637371a)Author to whom correspondence should be addressed: wensiang@ntu.edu.sg
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a)Author to whom correspondence should be addressed: wensiang@ntu.edu.sg
Note: This paper is part of the APL Special Collection on Magneto-ionic and electrostatic gating of magnetism: Phenomena and devices.
Appl. Phys. Lett. 122, 122403 (2023)
Article history
Received:
December 20 2022
Accepted:
March 06 2023
Citation
S. Wu, T. L. Jin, F. N. Tan, C. C. I. Ang, H. Y. Poh, G. J. Lim, W. S. Lew; Enhancement of spin–orbit torque in Pt/Co/HfOx heterostructures with voltage-controlled oxygen ion migration. Appl. Phys. Lett. 20 March 2023; 122 (12): 122403. https://doi.org/10.1063/5.0139443
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