# Effects of asymmetry in strongly coupled spin vortex pairs

## TL;DR

This paper investigates how magnetic asymmetries affect strongly coupled spin-vortex pairs in nanomagnets, revealing ways to differentiate stable states for potential information coding applications.

## Contribution

It provides experimental, analytical, and micromagnetic insights into how various magnetic asymmetries influence vortex pair states, expanding understanding for spintronic applications.

## Key findings

- Magnetic asymmetry can differentiate otherwise degenerate vortex states.
- Experimental and modeling results show control of vortex core states.
- Implications for coding information in topological spin states.

## Abstract

Effects of magnetic asymmetry on strongly coupled spin-vortex pairs with parallel core polarization and antiparallel chirality in synthetic nanomagnets are investigated. This includes vortex-core length asymmetry, biasing field asymmetry, and pinning of one of the two vortex cores. Our experimental observations as well as analytical and micromagnetic modeling show how magnetic asymmetry can be used to differentiate magneto-resistively otherwise degenerate multiple stable states of a vortex pair. These results expand the knowledge base for spin vortex arrays in nanostructures and should be useful in light of the recent proposals on coding information into multiple topological spin states, such as single and multiple vortex core/chirality states.