# Spin pumping as a generic probe for linear spin fluctuations: demonstration with ferromagnetic and antiferromagnetic orders, metallic and insulating electrical states

## TL;DR

This study demonstrates that spin pumping can serve as a universal probe for detecting linear spin fluctuations across various magnetic orders and electronic states, enhancing material characterization in spintronics.

## Contribution

It introduces a systematic experimental method using spin pumping to detect spin fluctuations, applicable to both metallic and insulating magnetic materials.

## Key findings

- Enhanced spin pumping correlates with magnetic ordering transitions.
- The effect is independent of the material's metallic or insulating nature.
- Spin fluctuations can be effectively probed via electronic or magnonic transport.

## Abstract

We investigated spin injection by spin pumping from a spin-injector(NiFe) into a spin-sink to detect spin fluctuations in the spin-sink. By scanning the ordering-temperature of several magnetic transitions, we found that enhanced spin pumping due to spin fluctuations applies with several ordering states: ferromagnetic(Tb) and antiferromagnetic(NiO, NiFeOx, BiFeO3, exchange-biased and unbiased IrMn). Results also represent systematic experimental investigation supporting that the effect is independent of the metallic and insulating nature of the spin-sink, and is observed whether the spin current probe involves electronic or magnonic transport, facilitating advances in material characterization and engineering for spintronic applications.

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Source: https://tomesphere.com/paper/1901.03539