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원자제어 저차원 전자계 연구단
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Nanoscale Antiferromagnetic Domain Imaging using Full-Field Resonant X-ray Magnetic Diffraction Microscopy

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Title
Nanoscale Antiferromagnetic Domain Imaging using Full-Field Resonant X-ray Magnetic Diffraction Microscopy
Author(s)
Choi, Taeyang; Zhang, Zhan; Hoon Kim; Sunwook Park; Kim, Jong-Woo; Lee, Kyeong Jun; Islam, Zahir; Welp, Ulrich; Chang, Seo Hyoung; Bumjoon Kim
Publication Date
2022-07
Journal
Advanced Materials, v.34, no.29
Publisher
John Wiley and Sons Inc
Abstract
© 2022 Wiley-VCH GmbH.The physical properties of magnetic materials frequently depend not only on the microscopic spin and electronic structures, but also on the structures of mesoscopic length scales that emerge, for instance, from domain formations, or chemical and/or electronic phase separations. However, experimental access to such mesoscopic structures is currently limited, especially for antiferromagnets with net zero magnetization. Here, full-field microscopy and resonant magnetic X-ray diffraction are combined to visualize antiferromagnetic (AF) domains of the spin–orbit Mott insulator Sr2IrO4 with area over ≈0.1 mm2 and with spatial resolution as high as ≈150 nm. With the unprecedented wide field of views and high spatial resolution, an intertwining of two AF domains on a length comparable to the measured average AF domain wall width of 545 nm is revealed. This mesoscopic structure comprises a substantial portion of the sample surface, and thus can result in a macroscopic response, which is unexpected from its microscopic magnetic structure. In particular, this symmetry analysis shows that the inversion symmetry, which is preserved by the microscopic AF order, becomes ill-defined at the mesoscopic length scale. This result underscores the importance of this novel technique for a thorough understanding of the physical properties of antiferromagnets.
URI
https://pr.ibs.re.kr/handle/8788114/12014
DOI
10.1002/adma.202200639
ISSN
0935-9648
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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