Van der Waals Magnet based Spin-Valve Devices at Room Temperature

Abstract

The discovery of van der Waals (vdW) magnets opened up a new paradigm for condensed matter physics and spintronic technologies. However, the operations of active spintronic devices with vdW magnets are so far limited to cryogenic temperatures, inhibiting its broader practical applications. Here, for the first time, we demonstrate room temperature spin-valve devices using vdW itinerant ferromagnet Fe5GeTe2 in heterostructures with graphene. The tunnel spin polarization of the Fe5GeTe2/graphene vdW interface is detected to be significantly large ~ 45 % and negative at room temperature. Lateral spin-valve device design enables electrical control of spin signal and realization of basic building blocks for device application such as efficient spin injection, transport, precession, and detection functionalities. Furthermore, measurements with different magnetic orientations provide unique insights into the magnetic anisotropy of Fe5GeTe2 and its relation with spin polarization and dynamics in the heterostructure. These findings open opportunities for the applications of vdW magnet-based all-2D spintronic devices and integrated spin circuits at ambient temperatures.

References in corpus (11)

• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe${}_3$GeTe${}_2$
• Electronic spin transport and spin precession in single graphene layers at room temperature
• Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling
• Tunneling spin valves based on Fe${}_3$GeTe${}_2$/hBN/Fe${}_3$GeTe${}_2$ van der Waals heterostructures
• Tunneling Spin Injection into Single Layer Graphene (Supplementary Information)
• Tunneling Spin Injection into Single Layer Graphene
• Room temperature spin Hall effect in graphene/MoS${}_2$ van der Waals heterostructures
• Micromagnetometry of two-dimensional ferromagnets
• Swapping Exchange and Spin-Orbit Coupling in 2D van der Waals Heterostructures

Cited by in corpus (2)

• Large-scale epitaxy of two-dimensional van der Waals room-temperature ferromagnet Fe5GeTe2
• Proximity effects in graphene on monolayers of transition-metal phosphorus trichalcogenides MPX${}_3$