Magnetic Proximity Effect in 2D Ferromagnetic CrBr3/Graphene van der Waals Heterostructures

TL;DR

This study demonstrates the magnetic proximity effect in 2D CrBr3/graphene heterostructures, revealing significant exchange fields and potential for advanced 2D spintronic devices through non-local measurements and Zeeman spin Hall effect analysis.

Contribution

It provides the first experimental evidence of magnetic proximity effect in CrBr3/graphene heterostructures using non-local measurements and Zeeman spin Hall effect.

Findings

Significant magnetic proximity exchange field observed.

Anomalous resistance changes at the Dirac point linked to MPE.

Potential for 2D spin logic and memory devices.

Abstract

Two-dimensional (2D) van der Waals heterostructures serve as a promising platform to exploit various physical phenomena in a diverse range of novel spintronic device applications. The efficient spin injection is the prerequisite for these devices. The recent discovery of magnetic 2D materials leads to the possibility of fully 2D van der Waals spintronics devices by implementing spin injection through magnetic proximity effect (MPE). Here, we report the investigation of magnetic proximity effect in 2D CrBr3/graphene van der Waals heterostructures, which is probed by Zeeman spin Hall effect through non-local measurements. Zeeman splitting field estimation demonstrates a significant magnetic proximity exchange field even in a low magnetic field. Furthermore, the observed anomalous longitudinal resistance changes at the Dirac point R_(XX,D)with increasing magnetic field at {\nu} = 0 may attribute to the MPE induced new ground state phases. This MPE revealed in our CrBr3/graphene van der Waals heterostructures therefore provides a solid physics basis and key functionality for next generation 2D spin logic and memory devices.