Giant Anomalous Hall Conductivity at the Pt/Cr 2O3 Interface

Takahiro Moriyama, Yu Shiratsuchi, Tatsuya Iino, Hikaru Aono, Motohiro Suzuki, Tetsuya Nakamura, Yoshinori Kotani, Ryoichi Nakatani, Kohji Nakamura, Teruo Ono

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1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number034052
JournalPhysical Review Applied
Volume13
Issue number3
DOIs
Publication statusPublished - 2020 Feb
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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