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We present measurements of interfacial Gilbert damping due to the spinpumping effect in Ni$_{81}$Fe$_{19}$/W heterostructures. Measurements werecompared for heterostructures in which the crystallographic phase of W, either$\alpha$(bcc)-W or $\beta$(A15)-W, was enriched through deposition conditionsand characterized using X-ray diffraction (XRD) and high-resolutioncross-sectional transmission electron microscopy (HR-XTEM). Single phaseNi$_{81}$Fe$_{19}$/$\alpha$-W heterostructures could be realized, butheterostructures with $\beta$-W were realized as mixed $\alpha$-$\beta$ phase.The spin mixing conductances (SMC) for W at interfaces with Ni$_{81}$Fe$_{19}$were found to be significantly lower than those for similarly heavy metals suchas Pd and Pt, but comparable to those for Ta, and independent of enrichment inthe $\beta$ phase.

journal of applied physics

Measurement of spin mixing conductance in Ni$_{81}$Fe$_{19}$/$\alpha$-W  and Ni$_{81}$Fe$_{19}$/$\beta$-W heterostrucutures via ferromagnetic  resonance