Phase diagram of magnetic domain walls in spin valve nano-stripes

TL;DR

This paper numerically explores the phase diagram of magnetic domain walls in Co/Cu/Py spin valve nano-stripes, revealing how interlayer magnetostatic interactions influence the stability of transverse walls and deriving an analytical scaling law.

Contribution

It provides a detailed numerical analysis of the phase diagram and introduces an analytical scaling law that accurately predicts the stability regions of domain walls in spin valve nano-stripes.

Findings

The stability range of transverse walls is extended in spin valves compared to single Py layers.

Magnetostatic screening between layers shifts the phase diagram.

An analytical scaling law accurately reproduces the phase diagram.

Abstract

We investigate numerically the transverse versus vortex phase diagram of head-to-head domain walls in Co/Cu/Py spin valve nano-stripes (Py: Permalloy), in which the Co layer is mostly single domain while the Py layer hosts the domain wall. The range of stability of the transverse wall is shifted towards larger thickness compared to single Py layers, due to a magnetostatic screening effect between the two layers. An approached analytical scaling law is derived, which reproduces faithfully the phase diagram.