Journal
ACS NANO
Volume 15, Issue 3, Pages 5086-5095Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c10200
Keywords
Berry phase; anomalous Hall effect; band structure reconstruction; two-channel model; spin-orbit coupling
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Funding
- King Abdullah University of Science and Technology (KAUST), Office of Sponsored Research (OSR) [OSR2019-CRG8-4801, OSR-2017-CRG6-3427, CRF-2015-SENSORS-2708]
- National Natural Science Foundation of China [11704278, 51772207, 11434006]
- Natural Science Foundation of Tianjin City [19JCQNJC03000]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-05CH11231, KCWF16]
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This study observed a sign change of Berry curvatures at the interface between the ferromagnet SrRuO3 layer and the SrIrO3 layer with strong spin-orbit coupling, leading to the appearance of a hump-like feature in the Hall resistivity loop.
The Berry phase, which reveals the intimate geometrical structure underlying quantum mechanics, plays a central role in the anomalous Hall effect. In this work, we observed a sign change of Berry curvatures at the interface between the ferromagnet SrRuO3 (SRO) layer and the SrIrO3 (SIO) layer with strong spin-orbit coupling. The negative Berry curvature at the interface, induced by the strongly spin-orbit-coupled Ir 5d bands near the Fermi level, makes the SRO/SIO interface different from the SRO layer that has a positive Berry curvature. These opposite Berry curvatures led to two anomalous Hall effect (AHE) channels with opposite signs at the SRO/SIO interface and in the SRO layer, respectively, resulting in a hump-like feature in the Hall resistivity loop. This observation offers a straightforward explanation of the hump-like feature that is usually associated with the chiral magnetic structure or magnetic skyrmions. Hence, this study provides evidence to oppose the widely accepted claim that magnetic skyrmions induce the hump-like feature.
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