Experimental test of the spin mixing interface conductivity concept

TL;DR

This study experimentally verifies the spin mixing interface conductivity concept by analyzing spin pumping, spin Seebeck, and spin Hall magnetoresistance effects in yttrium iron garnet/Pt samples, confirming their spin current origins.

Contribution

It provides a comprehensive experimental validation of the spin mixing conductance model across multiple spintronic effects using a consistent set of parameters.

Findings

Experimental data supports spin current-based models.

Quantitative description of the spin Seebeck effect.

Confirmation of the spintronic nature of observed effects.

Abstract

We perform a quantitative, comparative study of the spin pumping, spin Seebeck and spin Hall magnetoresistance effects, all detected via the inverse spin Hall effect in a series of over 20 yttrium iron garnet/Pt samples. Our experimental results fully support present, exclusively spin current-based, theoretical models using a single set of plausible parameters for spin mixing conductance, spin Hall angle and spin diffusion length. Our findings establish the purely spintronic nature of the aforementioned effects and provide a quantitative description in particular of the spin Seebeck effect.