Spin-Scattering Rates in Metallic Thin Films Measured by Ferromagnetic Resonance Damping Enhanced by Spin-Pumping

Abstract

We determined the spin-transport properties of Pd and Pt thin films by measuring the increase in ferromagnetic resonance damping due to spin-pumping in ferromagnetic (FM)-nonferromagnetic metal (NM) multilayers with varying NM thicknesses. The increase in damping with NM thickness depends strongly on both the spin- and charge-transport properties of the NM, as modeled by diffusion equations that include both momentum- and spin-scattering parameters. We use the analytical solution to the spin-diffusion equations to obtain spin-diffusion lengths for Pt and Pd. By measuring the dependence of conductivity on NM thickness, we correlate the charge- and spin-transport parameters, and validate the applicability of various models for momentum-scattering and spin-scattering rates in these systems: constant, inverse-proportional (Dyakanov-Perel), and linear-proportional (Elliot-Yafet). We confirm previous reports that the spin-scattering time can be shorter than the momentum scattering time in Pt, and the Dyakanov-Perel-like model is the best fit to the data.

References in corpus (5)

• Direct electronic measurement of the spin Hall effect
• Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
• Evolution of the spin Hall effect in Pt nanowires: Size and temperature effects
• Interface enhancement of Gilbert damping from first-principles
• Experimental Verification of Comparability between Spin-Orbit and Spin-Diffusion Lengths

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• Determining complex spin mixing conductance and spin diffusion length from spin pumping experiments in magnetic insulator/heavy metal bilayers
• Absorption of Transverse Spin Current in Ferromagnetic NiCu: Dominance of Bulk Dephasing over Spin-Flip Scattering
• Spin transport and magnetic proximity effect in CoFeB/normal metal/Pt trilayers
• Calculating interface transport parameters at finite temperatures: Nonmagnetic interfaces
• Disentangling electrical switching of antiferromagnetic NiO using high magnetic fields