# Angle resolved relaxation of spin currents by antiferromagnets in spin valves

## TL;DR

This paper demonstrates how the relaxation of spin currents in spin valves can be tuned by adjusting the angle between ferromagnetic excitation and antiferromagnetic order, revealing new insights into spin transport mechanisms.

## Contribution

It introduces a method to control spin current relaxation via angle manipulation in spin valves, highlighting the role of both spin-mixing and longitudinal conductance.

## Key findings

- Spin current relaxation is angle-dependent in spin valves.
- Interplay between spin-mixing and longitudinal conductance affects relaxation.
- Experimental results align with recent theoretical predictions.

## Abstract

We observe and analyze tunable relaxation of a pure spin current by an antiferromagnet in spin-valves. This is achieved by carefully controlling the angle between a resonantly excited ferromagnetic layer pumping the spin current and the N\'eel vector of the antiferromagnetic layer. The effect is observed as an angle-dependent spin-pumping contribution to the ferromagnetic resonance linewidth. An interplay between spin-mixing conductance and, often disregarded, longitudinal spin conductance is found to underlie our observations, which is in agreement with a recent prediction for related ferromagnetic spin valves.