Interface enhancement of Gilbert damping from first principles

Yi Liu, Zhe Yuan, R.J.H. Wesselink, Anton A. Starikov, Paul J. Kelly

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Abstract

The enhancement of Gilbert damping observed for Ni 80 Fe 20 (Py) films in contact with the nonmagnetic metals Cu, Pd, Ta, and Pt is quantitatively reproduced using first-principles scattering calculations. The “spin-pumping” theory that qualitatively explains its dependence on the Py thickness is generalized to include a number of extra factors known to be important for spin transport through interfaces. Determining the parameters in this theory from first principles shows that interface spin flipping makes an essential contribution to the damping enhancement. Without it, a much shorter spin-flip diffusion length for Pt would be needed than the value we calculate independently
Original languageEnglish
Article number207202
Number of pages5
JournalPhysical review letters
Volume113
DOIs
Publication statusPublished - 2014

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damping
augmentation
diffusion length
pumping
scattering
metals

Keywords

  • METIS-306267
  • IR-94946

Cite this

Liu, Yi ; Yuan, Zhe ; Wesselink, R.J.H. ; Starikov, Anton A. ; Kelly, Paul J. / Interface enhancement of Gilbert damping from first principles. In: Physical review letters. 2014 ; Vol. 113.
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Interface enhancement of Gilbert damping from first principles. / Liu, Yi; Yuan, Zhe; Wesselink, R.J.H.; Starikov, Anton A.; Kelly, Paul J.

In: Physical review letters, Vol. 113, 207202, 2014.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Liu, Yi

AU - Yuan, Zhe

AU - Wesselink, R.J.H.

AU - Starikov, Anton A.

AU - Kelly, Paul J.

PY - 2014

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N2 - The enhancement of Gilbert damping observed for Ni 80 Fe 20 (Py) films in contact with the nonmagnetic metals Cu, Pd, Ta, and Pt is quantitatively reproduced using first-principles scattering calculations. The “spin-pumping” theory that qualitatively explains its dependence on the Py thickness is generalized to include a number of extra factors known to be important for spin transport through interfaces. Determining the parameters in this theory from first principles shows that interface spin flipping makes an essential contribution to the damping enhancement. Without it, a much shorter spin-flip diffusion length for Pt would be needed than the value we calculate independently

AB - The enhancement of Gilbert damping observed for Ni 80 Fe 20 (Py) films in contact with the nonmagnetic metals Cu, Pd, Ta, and Pt is quantitatively reproduced using first-principles scattering calculations. The “spin-pumping” theory that qualitatively explains its dependence on the Py thickness is generalized to include a number of extra factors known to be important for spin transport through interfaces. Determining the parameters in this theory from first principles shows that interface spin flipping makes an essential contribution to the damping enhancement. Without it, a much shorter spin-flip diffusion length for Pt would be needed than the value we calculate independently

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KW - IR-94946

U2 - 10.1103/PhysRevLett.113.207202

DO - 10.1103/PhysRevLett.113.207202

M3 - Article

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JO - Physical review letters

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