期刊
PHYSICAL REVIEW APPLIED
卷 13, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.13.034052
关键词
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资金
- JSPS KAKENHI [17K18991, 17H05181, 17H04924]
- Grants-in-Aid for Scientific Research [17H05181, 17H04924, 17K18991] Funding Source: KAKEN
The interface between a magnetic material and a heavy metal that has a large spin-orbit interaction is at the root of various spin-related phenomena. In this paper, we address the peculiar spin-dependent transport at a Pt/Cr2O3 interface by exploring the origin of the nonlinear anomalous Hall effect (AHE) in Pt/Cr2O3 bilayers. X-ray magnetic circular dichroism (XMCD) measurements show no appreciable magnetic moment at the interface originating from Cr 3d and Pt 5d orbitals, which could be associated with the AHE response. A possible interfacial magnetic moment M at the Pt/Cr2O3 interface, assumed from the detection limit of the XMCD measurements, yields an anomalous Hall conductivity (sigma AHE) per unit net magnetic moment (M), -sigma(AHE)/M, of 0.57 V-1, which is extraordinary large compared with that for general magnetic materials. Together with first-principles calculations, the results suggest the possibility of an intrinsic AHE in the Pt/Cr2O3 interface that does not rely on the net magnetic moment.
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