Dynamic dependence to domain wall propagation through artificial spin ice

TL;DR

This study investigates how domain walls propagate in artificial spin ice structures, revealing that their movement depends on the applied magnetic field, which influences their behavior below the nucleation threshold.

Contribution

The paper demonstrates controlled domain wall propagation in artificial spin ice using pulsed magnetic fields and magneto-optical detection, highlighting field-dependent dynamics.

Findings

Propagation distance depends on the driving magnetic field.

Domain walls exhibit field-driven behavior below nucleation field.

Electrical and optical methods enable detailed probing of domain wall transit.

Abstract

Domain wall propagation dynamics have been studied in nanostructured artificial kagome spin ice structures. A stripline circuit has been used to provide localised pulsed magnetic fields within the artificial spin ice structure. This provides control of the system through electrically assisted domain wall nucleation events. Synchronisation of the pulsed fields with additional global magnetic fields and the use of a focussed magneto-optical Kerr effect magnetometer allows our experiments to probe the domain wall transit through an extended ASI structure. We find that the propagation distance depends on the driving field revealing field driven properties of domain walls below their intrinsic nucleation field.