Quantifying interface and bulk contributions to spin-orbit torque in magnetic bilayers

Xin Fan, Halise Celik, Jun Wu, Chaoying Ni, Kyoung Jin Lee, Virginia O. Lorenz, John Q. Xiao

Research output: Contribution to journalArticle

147 Citations (Scopus)

Abstract

Spin-orbit interaction-driven phenomena such as the spin Hall and Rashba effect in ferromagnetic/heavy metal bilayers enables efficient manipulation of the magnetization via electric current. However, the underlying mechanism for the spin-orbit interaction-driven phenomena remains unsettled. Here we develop a sensitive spin-orbit torque magnetometer based on the magneto-optic Kerr effect that measures the spin-orbit torque vectors for cobalt iron boron/platinum bilayers over a wide thickness range. We observe that the Slonczewski-like torque inversely scales with the ferromagnet thickness, and the field-like torque has a threshold effect that appears only when the ferromagnetic layer is thinner than 1 nm. Through a thickness-dependence study with an additional copper insertion layer at the interface, we conclude that the dominant mechanism for the spin-orbit interaction-driven phenomena in this system is the spin Hall effect. However, there is also a distinct interface contribution, which may be because of the Rashba effect.

Original languageEnglish
Article number3042
JournalNature Communications
Volume5
DOIs
Publication statusPublished - 2014 Jan 9

Fingerprint

Torque
Orbit
torque
Orbits
spin-orbit interactions
orbits
Hall effect
Spin Hall effect
magneto-optics
heavy metals
Kerr effects
Magnetooptical effects
electric current
Boron
Magnets
magnetometers
Electric currents
manipulators
insertion
Magnetometers

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Quantifying interface and bulk contributions to spin-orbit torque in magnetic bilayers. / Fan, Xin; Celik, Halise; Wu, Jun; Ni, Chaoying; Lee, Kyoung Jin; Lorenz, Virginia O.; Xiao, John Q.

In: Nature Communications, Vol. 5, 3042, 09.01.2014.

Research output: Contribution to journalArticle

Fan, Xin ; Celik, Halise ; Wu, Jun ; Ni, Chaoying ; Lee, Kyoung Jin ; Lorenz, Virginia O. ; Xiao, John Q. / Quantifying interface and bulk contributions to spin-orbit torque in magnetic bilayers. In: Nature Communications. 2014 ; Vol. 5.
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AU - Xiao, John Q.

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