Antiferromagnetic Bloch line driven by spin current as room-temperature analog of a fluxon in a long Josephson junction

Abstract

Antiferromagnets (AFMs) are promising materials for future high-frequency field-free spintronic applications. Self-localized spin structures can enhance their capabilities and introduce new functionalities to AFM-based devices. Here we consider a domain wall (DW), a topological soliton that bridges a connection between two ground states, similar to a Josephson junction (JJ) link between two superconductors. We demonstrate the similarities between DWs in bi-axial AFM with easy-axis primary anisotropy, driven by a spin current, and long Josephson junctions (LJJs). We found that the Bloch line (BL) in DWs resembles the fluxon state of JJs, creating a close analogy between the two systems. We propose a scheme that allows us to create, move, read, and delete such BLs. This transmission line operates at room temperature and can be dynamically reconfigured in contrast to superconductors. Results of a developed model were confirmed by micromagnetic simulations for Cr${}_2$O${}_3$ and DyFeO${}_3$, i.e., correspondingly with weak and strong in-plane anisotropy. Overall, the proposed scheme has significant potential for use in magnetic memory and logic devices.

8 pages, 5 figures; Published in Physical Review Applied

References in corpus (4)

• Superfluid spin transport through antiferromagnetic insulators
• Propulsion of a domain wall in an antiferromagnet by magnons
• Dynamics of a vortex domain wall in a magnetic nanostrip: an application of the collective coordinate approach
• Reading-out the state of a flux qubit by Josephson transmission line solitons

Cited by in corpus (3)

• Emission of fast-propagating spin waves by an antiferromagnetic domain wall driven by spin current
• Antiferromagnetic droplet soliton driven by spin current
• Current-driven dynamics of antiferromagnetic domain-wall skyrmions