Defect-driven antiferromagnetic domain walls in CuMnAs films

Reimers, Sonka; Kriegner, Dominik; Gomonay, Olena; Carbone, Dina; Krizek, Filip; Novák, Vit; Campion, Richard P.; Maccherozzi, Francesco; Björling, Alexander; Amin, Oliver J.; Barton, Luke X.; Poole, Stuart F.; Omari, Khalid A.; Michalička, Jan; Man, Ondřej; Sinova, Jairo; Jungwirth, Tomáš; Wadley, Peter; Dhesi, Sarnjeet S.; Edmonds, Kevin W.

Abstract

Efficient manipulation of antiferromagnetic (AF) domains and domain walls has opened up new avenues of research towards ultrafast, high-density spintronic devices. AF domain structures are known to be sensitive to magnetoelastic effects, but the microscopic interplay of crystalline defects, strain and magnetic ordering remains largely unknown. Here, we reveal, using photoemission electron microscopy combined with scanning X-ray diffraction imaging and micromagnetic simulations, that the AF domain structure in CuMnAs thin films is dominated by nanoscale structural twin defects. We demonstrate that microtwin defects, which develop across the entire thickness of the film and terminate on the surface as characteristic lines, determine the location and orientation of 180∘ and 90∘ domain walls. The results emphasize the crucial role of nanoscale crystalline defects in determining the AF domains and domain walls, and provide a route to optimizing device performance.

Citation

Reimers, S., Kriegner, D., Gomonay, O., Carbone, D., Krizek, F., Novák, V., …Edmonds, K. W. (2022). Defect-driven antiferromagnetic domain walls in CuMnAs films. Nature Communications, 13(1), Article 724. https://doi.org/10.1038/s41467-022-28311-x

• Journal Article Type: Article
• Acceptance Date: Jan 19, 2022
• Online Publication Date: Feb 7, 2022
• Publication Date: Feb 7, 2022
• Deposit Date: Feb 8, 2022
• Publicly Available Date: Feb 8, 2022
• Journal: Nature Communications
• Electronic ISSN: 2041-1723
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 13
• Issue: 1
• Article Number: 724
• DOI: https://doi.org/10.1038/s41467-022-28311-x
• Keywords: General Physics and Astronomy; General Biochemistry, Genetics and Molecular Biology; General Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/7411293
• Publisher URL: https://www.nature.com/articles/s41467-022-28311-x