Spin-transfer mechanism for magnon-drag thermopower

TL;DR

This paper establishes a theoretical link between spin-transfer torque and magnon drag thermopower in ferromagnets, enabling estimation of key parameters and insights into thermoelectric effects.

Contribution

It introduces a relation between the spin-transfer-torque parameter and magnon drag thermopower, allowing parameter estimation from experimental data.

Findings

Estimated the spin-transfer-torque parameter in iron at low temperatures.

Proposed a method to determine magnon drag contribution from thermopower measurements.

Linked spin transfer phenomena with thermoelectric effects in ferromagnetic materials.

Abstract

We point out a relation between the dissipative spin-transfer-torque parameter $\beta$ and the contribution of magnon drag to the thermoelectric power in conducting ferromagnets. Using this result we estimate $\beta$ in iron at low temperatures, where magnon drag is believed to be the dominant contribution to the thermopower. Our results may be used to determine $\beta$ from magnon-drag-thermopower experiments, or, conversely, to infer the strength of magnon drag via experiments on spin transfer.