Effects of the dynamical magnetization state on spin transfer

TL;DR

This paper uses simulations to explore how the dynamical states of local spins influence spin transfer, revealing that electron-magnetization interactions depend heavily on energy and can be controlled through spectral tailoring.

Contribution

It introduces a detailed analysis of the interplay between spin transfer and magnetization dynamics, emphasizing the role of electron energy and spectral control in magnetic systems.

Findings

Spin transfer depends on electron energy and magnetization state.

Electron interactions involve reflection, transmission, and magnon processes.

Control of spectral characteristics can optimize spin transfer efficiency.

Abstract

We utilize simulations of electron scattering by a chain of dynamical quantum spins, to analyze the interplay between the spin transfer effect and the magnetization dynamics. We show that the complex interactions between the spin-polarized electrons and the dynamical states of the local spins can be decomposed into separate processes involving electron reflection and transmission, as well as absorption and emission of magnons - the quanta of magnetization dynamics. Analysis shows that these processes are substantially constrained by the energy and momentum conversation laws, resulting in a significant dependence of spin transfer on the electron's energy and the dynamical state of the local spins. Our results suggest that exquisite control of spin transfer efficiency and of the resulting dynamical magnetization states may be achievable by tailoring the spectral characteristics of the conduction electrons and of the magnetic systems.