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Sign-tunable anomalous Hall effect induced by two-dimensional symmetry-protected nodal structures in ferromagnetic perovskite thin films

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Title
Sign-tunable anomalous Hall effect induced by two-dimensional symmetry-protected nodal structures in ferromagnetic perovskite thin films
Author(s)
Byungmin Sohn; Eunwoo Lee; Park, Se Young; Wonshik Kyung; Hwang, Jinwoong; Denlinger, Jonathan D.; Minsoo Kim; Donghan Kim; Bongju Kim; Hanyoung Ryu; Soonsang Huh; Ji Seop Oh; Jong Keun Jung; Dongjin Oh; Younsik Kim; Han, Moonsup; Tae Won Noh; Bohm-Jung Yang; Changyoung Kim
Publication Date
2021-12
Journal
Nature Materials, v.20, no.12, pp.1643 - 1649
Publisher
Nature Research
Abstract
© 2021, The Author(s), under exclusive licence to Springer Nature Limited.Magnetism and spin–orbit coupling are two quintessential ingredients underlying topological transport phenomena in itinerant ferromagnets. When spin-polarized bands support nodal points/lines with band degeneracy that can be lifted by spin–orbit coupling, the nodal structures become a source of Berry curvature, leading to a large anomalous Hall effect. However, two-dimensional systems can possess stable nodal structures only when proper crystalline symmetry exists. Here we show that two-dimensional spin-polarized band structures of perovskite oxides generally support symmetry-protected nodal lines and points that govern both the sign and the magnitude of the anomalous Hall effect. To demonstrate this, we performed angle-resolved photoemission studies of ultrathin films of SrRuO3, a representative metallic ferromagnet with spin–orbit coupling. We show that the sign-changing anomalous Hall effect upon variation in the film thickness, magnetization and chemical potential can be well explained by theoretical models. Our work may facilitate new switchable devices based on ferromagnetic ultrathin films.
URI
https://pr.ibs.re.kr/handle/8788114/11013
DOI
10.1038/s41563-021-01101-4
ISSN
1476-1122
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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