AC magnetization transport and power absorption in non-itinerant spin chains

TL;DR

This paper studies how alternating current (AC) magnetization propagates and is absorbed in non-itinerant quantum spin chains, revealing how exchange interactions influence power dissipation, with implications for spintronic device efficiency.

Contribution

It provides a quantitative analysis of AC magnetization transport and power absorption in non-itinerant spin chains, highlighting the role of exchange interactions in controlling dissipation.

Findings

Exchange interaction differences significantly affect power absorption.

Magnetic systems can outperform electronic counterparts in energy efficiency.

Theoretical predictions enable future spintronic device optimization.

Abstract

We investigate the ac transport of magnetization in non-itinerant quantum systems such as spin chains described by the XXZ Hamiltonian. Using linear response theory, we calculate the ac magnetization current and the power absorption of such magnetic systems. Remarkably, the difference in the exchange interaction of the spin chain itself and the bulk magnets (i.e. the magnetization reservoirs), to which the spin chain is coupled, strongly influences the absorbed power of the system. This feature can be used in future spintronic devices to control power dissipation. Our analysis allows to make quantitative predictions about the power absorption and we show that magnetic systems are superior to their electronic counter parts.