Micromagnetic Simulations for Spin Transfer Torque in Magnetic Multilayers

TL;DR

This paper uses micromagnetic simulations to analyze spin transfer torque effects in magnetic multilayers, incorporating various STT terms and the Oersted field to study switching current densities.

Contribution

It introduces an enhanced micromagnetic simulation framework including multiple STT components and Oersted field effects for magnetic multilayer structures.

Findings

Determined switching current densities for different multilayer configurations.

Analyzed effects of higher-order field-like STT terms.

Assessed impact of Oersted field on switching behavior.

Abstract

We investigate the spin transfer torque (STT) in the magnetic multilayer structures with micromagnetic simulations. We implement the STT contribution for the magnetic multilayer structures in addition to the Landau-Lifshitz-Gilbert (LLG) micromagnetic simulators. Not only the Sloncewski STT term, the zero, first, and second order field- like terms are also considered, and the effects of the Oersted field by the current are addressed. We determine the switching current densities of the free layer with the exchange biased synthetic ferrimagnetic reference layers for various cases.