Measurement of spin mixing conductance in Ni81Fe19/α-W and Ni81Fe19/β-W heterostructures via ferromagnetic resonance

We present measurements of interfacial Gilbert damping due to the spin pumping effect in Ni81Fe19/W heterostructures. Measurements were compared for heterostructures in which the crystallographic phase of W, either α(bcc)-W or β(A15)-W, was enriched through deposition conditions and characterized us...

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Bibliographic Details
Published in:Journal of applied physics 2019-07, Vol.126 (4)
Main Authors: Cao, W., Liu, J., Zangiabadi, A., Barmak, K., Bailey, W. E.
Format: Article
Language:English
Subjects:
Applied physics
Beta phase
Crystallography
Damping
Electrons
Ferromagnetic resonance
Ferromagnetism
Heavy metals
Heterostructures
Palladium
Platinum
Resistance
Tantalum
Transmission electron microscopy
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Summary:We present measurements of interfacial Gilbert damping due to the spin pumping effect in Ni81Fe19/W heterostructures. Measurements were compared for heterostructures in which the crystallographic phase of W, either α(bcc)-W or β(A15)-W, was enriched through deposition conditions and characterized using X-ray diffraction and high-resolution cross-sectional transmission electron microscopy. Single-phase Ni81Fe19/α-W heterostructures could be realized, but heterostructures with β-W were realized as a mixed α-β phase. The spin mixing conductances for W at interfaces with Ni81Fe19 were found to be significantly lower than those for similar heavy metals such as Pd and Pt, but comparable to those for Ta, and independent of enrichment in the β phase.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5099913