Tunable magnetization relaxation in spin valves

TL;DR

This paper investigates how the magnetization relaxation in spin valves can be tuned by manipulating the magnetic configuration, using simulations that incorporate tensor-like damping influenced by spin pumping and interfacial properties.

Contribution

It introduces a model where the damping parameters in spin valves are tunable via magnetic configuration, considering tensor-like damping and spin pumping effects.

Findings

Relaxation time depends on magnetic configuration.

Damping parameters are tunable through interfacial properties.

Tensor-like damping significantly affects magnetization dynamics.

Abstract

In spin values the damping parameters of the free layer are determined non-locally by the entire magnetic configuration. In a dual spin valve structure that comprises a free layer embedded between two pinned layers, the spin pumping mechanism, in combination with the angular momentum conservation, renders the tensor-like damping parameters tunable by varying the interfacial and diffusive properties. Simulations based on the Landau-Lifshitz-Gilbert phenomenology for a macrospin model are performed with the tensor-like damping and the relaxation time of the free layer magnetization is found to be largely dependent on while tunable through the magnetic configuration of the source-drain magnetization.