In this work we report efficient out-of-plane spin injection and detection in an all-van der Waals based heterostructure using only exfoliated 2D materials. We demonstrate spin injection by measuring spin-valve and Hanle signals in non-local transport in a stack of Fe3GeTe2 (FGT), hexagonal boron nitride (hBN) and graphene layers. FGT flakes form the spin aligning electrodes necessary to inject and detect spins in the graphene channel. The hBN tunnel barrier provides a high-quality interface between the ferromagnetic electrodes and graphene, eliminating the conductivity mismatch problem, thus ensuring efficient spin injection and detection with spin injection efficiencies of up to P=40\%. Our results demonstrate that FGT/hBN/graphene heterostructures form a promising platform for realizing 2D van der Waals spintronic devices.
@article{arxiv.2503.02471,
title = {Spin injection and detection in all-van der Waals 2D devices},
author = {Jan Bärenfänger and Klaus Zollner and Lukas Cvitkovich and Kenji Watanabe and Takashi Taniguchi and Stefan Hartl and Jaroslav Fabian and Jonathan Eroms and Dieter Weiss and Mariusz Ciorga},
journal= {arXiv preprint arXiv:2503.02471},
year = {2025}
}