Circular stripe domains and cone state vortices in disk-shaped exchange coupled magnetic heterostructures

TL;DR

This paper investigates how to control complex magnetic textures like cone state vortices and circular stripe domains in layered magnetic heterostructures through interlayer exchange and geometry, with potential spintronic applications.

Contribution

It introduces a method to tune magnetic textures in heterostructures by adjusting exchange coupling and geometry, supported by micromagnetic simulations and analytical models.

Findings

Number of circular stripes controlled by exchange and geometry

Continuous phase transition between magnetic states

Potential for magnetic texture engineering in spintronics

Abstract

Vertically stacked exchange coupled magnetic heterostructures of cylindrical geometry can host complex noncolinear magnetization patterns. By tuning the interlayer exchange coupling between a layer accommodating magnetic vortex state and an out-of-plane magnetized layer, one can efficiently realize new topological chiral textures such as cone state vortices and circular stripe domains. We study how the number of circular stripes can be controlled by both the interlayer exchange coupling and the sample geometrical parameters. By varying geometrical parameters, a continuous phase transition between the homogeneous state, cone state vortex, circular stripe domains, and the imprinted vortex takes place, which is analysed by full scale micromagnetic simulations. The analytical description provides an intuitive pictures of the magnetization textures in each of these phases. The possibility to realize switching between different states allows for engineering magnetic textures with possible applications in spintronic devices.