TY - JOUR
T1 - Giant Anomalous Hall Conductivity at the Pt/Cr 2O3 Interface
AU - Moriyama, Takahiro
AU - Shiratsuchi, Yu
AU - Iino, Tatsuya
AU - Aono, Hikaru
AU - Suzuki, Motohiro
AU - Nakamura, Tetsuya
AU - Kotani, Yoshinori
AU - Nakatani, Ryoichi
AU - Nakamura, Kohji
AU - Ono, Teruo
N1 - Funding Information:
The XMCD measurements are performed at BL39XU and BL25SU at the SPring-8 synchrotron radiation facility with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposals No. 2013A1751, No. 2015A1215, No. 2017A1212, and No. 2017B0079). This work is partly supported by JSPS KAKENHI (Grants No. 17K18991, No. 17H05181, and No. 17H04924).
Publisher Copyright:
© 2020 American Physical Society.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/2
Y1 - 2020/2
N2 - 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 (σAHE) per unit net magnetic moment (M),-σAHE/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.
AB - 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 (σAHE) per unit net magnetic moment (M),-σAHE/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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U2 - 10.1103/PhysRevApplied.13.034052
DO - 10.1103/PhysRevApplied.13.034052
M3 - Article
AN - SCOPUS:85082833047
VL - 13
JO - Physical Review Applied
JF - Physical Review Applied
SN - 2331-7019
IS - 3
M1 - 034052
ER -