Enhanced spin-orbit torque by engineering Pt resistivity in Pt/Co/Al Ox structures

Jae Wook Lee, Young Wan Oh, Seung Young Park, Adriana I. Figueroa, Gerrit Van Der Laan, Gyungchoon Go, Kyoung Jin Lee, Byong Guk Park

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The magnetization direction in heavy-metal (HM)/ferromagnet bilayers can be electrically controlled by spin-orbit torque (SOT); however, the efficiency of the SOT which depends on the spin-orbit coupling of the HM layer or its spin-Hall angle has to be improved further for actual applications. In this study, we report a significant enhancement of the spin-Hall effect of Pt and resultant SOT in Pt/Co/AlOx structures by controlling the Pt resistivity. We observed that the effective spin-Hall angle increases about three times as the resistivity of Pt layer is increased 1.6 times by changing the Ar deposition pressure from 3 to 50 mTorr. This enhancement in effective spin-Hall angle is confirmed by the reduction in the critical current for SOT-induced magnetization switching. Furthermore, x-ray absorption spectroscopy analysis reveals a non-negligible contribution of the interfacial spin-orbit coupling to the effective spin-Hall angle. Our result, the efficient control of effective spin Hall angle by controlling the HM resistivity, paves the way to improved switching efficiency in SOT-active devices.

Original languageEnglish
Article number064405
JournalPhysical Review B
Volume96
Issue number6
DOIs
Publication statusPublished - 2017 Aug 3

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torque
Orbits
Torque
engineering
orbits
electrical resistivity
Heavy Metals
Heavy metals
heavy metals
Magnetization
Spin Hall effect
Critical currents
Absorption spectroscopy
magnetization
X rays
augmentation
x ray absorption
x ray spectroscopy
Hall effect
critical current

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Lee, J. W., Oh, Y. W., Park, S. Y., Figueroa, A. I., Van Der Laan, G., Go, G., ... Park, B. G. (2017). Enhanced spin-orbit torque by engineering Pt resistivity in Pt/Co/Al Ox structures. Physical Review B, 96(6), [064405]. https://doi.org/10.1103/PhysRevB.96.064405

Enhanced spin-orbit torque by engineering Pt resistivity in Pt/Co/Al Ox structures. / Lee, Jae Wook; Oh, Young Wan; Park, Seung Young; Figueroa, Adriana I.; Van Der Laan, Gerrit; Go, Gyungchoon; Lee, Kyoung Jin; Park, Byong Guk.

In: Physical Review B, Vol. 96, No. 6, 064405, 03.08.2017.

Research output: Contribution to journalArticle

Lee, JW, Oh, YW, Park, SY, Figueroa, AI, Van Der Laan, G, Go, G, Lee, KJ & Park, BG 2017, 'Enhanced spin-orbit torque by engineering Pt resistivity in Pt/Co/Al Ox structures', Physical Review B, vol. 96, no. 6, 064405. https://doi.org/10.1103/PhysRevB.96.064405
Lee JW, Oh YW, Park SY, Figueroa AI, Van Der Laan G, Go G et al. Enhanced spin-orbit torque by engineering Pt resistivity in Pt/Co/Al Ox structures. Physical Review B. 2017 Aug 3;96(6). 064405. https://doi.org/10.1103/PhysRevB.96.064405
Lee, Jae Wook ; Oh, Young Wan ; Park, Seung Young ; Figueroa, Adriana I. ; Van Der Laan, Gerrit ; Go, Gyungchoon ; Lee, Kyoung Jin ; Park, Byong Guk. / Enhanced spin-orbit torque by engineering Pt resistivity in Pt/Co/Al Ox structures. In: Physical Review B. 2017 ; Vol. 96, No. 6.
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