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Instruments / Technical Area	Publication Details	Published	Actions
I06-Nanoscience (XPEEM)	Defect-driven antiferromagnetic domain walls in CuMnAs films Sonka Reimers , Dominik Kriegner , Olena Gomonay , Dina Carbone , Filip Krizek , Vit Novák , Richard P. Campion , Francesco Maccherozzi , Alexander Bjorling , Oliver J. Amin , Luke X. Barton , Stuart F. Poole , Khalid A. Omari , Jan Michalička , Ondřej Man , Jairo Sinova , Tomáš Jungwirth , Peter Wadley , Sarnjeet S. Dhesi , Kevin W. Edmonds Nature Communications 13 DOI: 10.1038/s41467-022-28311-x Diamond Proposal Number(s): [22437, 2714] Open Access Show Abstract ▼ 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.	Feb 2022
I06-Nanoscience (XPEEM)	Atomically sharp domain walls in an antiferromagnet Filip Krizek , Sonka Reimers , Zdeněk Kašpar , Alberto Marmodoro , Jan Michalička , Ondřej Man , Alexander Edström , Oliver J. Amin , Kevin W. Edmonds , Richard P. Campion , Francesco Maccherozzi , Sarnjeet S. Dhesi , Jan Zubáč , Domink Kriegner , Dina Carbone , Jakub Železný , Karel Výborný , Kamil Olejník , Vít Novák , Jan Rusz , Juan-Carlos Idrobo , Peter Wadley , Tomas Jungwirth Science Advances 8 DOI: 10.1126/sciadv.abn3535 Diamond Proposal Number(s): [22437] Open Access Show Abstract ▼ Abstract: The interest in understanding scaling limits of magnetic textures such as domain walls spans the entire field of magnetism from its physical fundamentals to applications in information technologies. Here, we explore antiferromagnetic CuMnAs in which imaging by x-ray photoemission reveals the presence of magnetic textures down to nanoscale, reaching the detection limit of this established microscopy in antiferromagnets. We achieve atomic resolution by using differential phase-contrast imaging within aberration-corrected scanning transmission electron microscopy. We identify abrupt domain walls in the antiferromagnetic film corresponding to the Néel order reversal between two neighboring atomic planes. Our work stimulates research of magnetic textures at the ultimate atomic scale and sheds light on electrical and ultrafast optical antiferromagnetic devices with magnetic field–insensitive neuromorphic functionalities.	Apr 2022

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