Angular dependence of the domain wall depinning field in the sensors with segmented corners

TL;DR

This study investigates how the magnetic field angle affects the domain wall depinning in segmented corner sensors, revealing complex angular dependence and switching behaviors modeled simply.

Contribution

It provides the first detailed analysis of angular dependence of depinning fields in segmented corner geometries, highlighting the influence of initial state and geometry.

Findings

Depinning field shows complex angular dependence with 180° periodicity.

Two distinct switching processes depend on the applied field angle.

A simple model successfully reproduces the observed angular dependence.

Abstract

Rotating domain wall based sensors that have recently been developed are based on a segmented looping geometry. In order to determine the crucial pinning of domain walls in this special geometry, we investigate the depinning under different angles of an applied magnetic field and obtain the angular dependence of the depinning field of the domain walls. Due to the geometry, the depinning field not only exhibits a 180$^\circ$-periodicity but a more complex dependence on the angle. The depinning field depends on two different angles associated with the initial state and the segmented geometry of the corner. We find that depending on the angle of the applied field two different switching processes occur and we can reproduce the angular dependence using a simple model calculation.