Magnetic structure of domain walls confined in a nano-oxide layer

TL;DR

This paper investigates the magnetic structures of current-confined-paths in nano-oxide layers within spin-valves, revealing how shape and size influence magnetic stability and suggesting design improvements for better magnetoresistance performance.

Contribution

It provides a detailed analysis of how the shape and size of current-confined-paths affect magnetic structures and stability in nano-oxide layer spin-valves, offering guidelines for optimizing MR ratio.

Findings

Narrow, high aspect ratio current-confined-paths enhance MR ratio.

Shape and size significantly influence magnetic structure and thermal stability.

Strong constriction in the path improves device performance.

Abstract

In the recent years, a spin-valve was developed with a current-confined-path structure consisting of a non-oxide-layer (NOL). We analyze magnetic structures of the current-confinedpath in the nano-oxide layer sandwiched between ferromagnetic electrodes and clarify the dependency of the magnetic structure on the shape and size of the current-confined-path. Our results of stiffness energy density and thermal stability shows that we should fabricate a CPP spin-valve with narrow current-confinedpaths with large aspect ratio and strong constriction in order to enhance the MR ratio.