Dynamics of localized spins coupled to the conduction electrons with charge/spin currents

TL;DR

This paper investigates how charge and spin currents influence the dynamics of localized spins, revealing complex behaviors such as steady states, periodic motion, and chaos, with implications for spin current detection.

Contribution

It derives exact equations of motion for localized spins under charge/spin currents up to second order in exchange coupling and explores their complex dynamics.

Findings

Dynamics depend on the relative magnitude of charge and spin currents.

Identifies steady state, periodic, and chaotic behaviors in spin dynamics.

Discusses potential applications like spin current detectors.

Abstract

The effects of the charge/spin currents of conduction electrons on the dynamics of the localized spins are studied in terms of the perturbation in the exchange coupling $J_{K}$ between them. The equations of motion for the localized spins are derived exactly up to $O(J_{K}^2)$, and the equations for the two-spin system is solved numerically. It is found that the dynamics depends sensitively upon the relative magnitude of the charge and spin currents, i.e., it shows steady state, periodic motion, and even chaotic behavior. Extension to the multi-spin system and its implications including possible ``spin current detector'' are also discussed.