YRLG Workshop: Correlation and Topology in magnetic materials, July 16th - 18th 2024
Talieh Ghiasi
Graphene-based van der Waals heterostructures are a promising choice for spintronic devices since the superior spin and charge transport properties of graphene are enriched via its proximity to other 2D materials. By the proximity effects, one can induce spin-orbit couplings [1-2] and magnetic exchange interactions [3-4] in graphene that couple charge and spin currents. In particular, our recent spin transport measurements in graphene in the proximity of 2D magnetic materials have shown that graphene acquires a spin polarization of about 14% arising from a large induced exchange interaction. This strong spin-polarization of the conductivity also results in the observation of the spin-dependent Seebeck effect in graphene, highlighting the active role of magnetic graphene in the electrical and thermal generation of spin currents [3]. Moreover, we evaluate the charge transport in magnetized graphene in the quantum Hall regime, where the magnetic orbital and exchange interactions result in an energy modulation of the Landau levels and allow for the detection of spin-polarized edge states at zero external magnetic field. Remarkably, we observe that the quantum anomalous Hall transport in the magnetized graphene persists up to room temperature [4]. The preserved long-distance spin transport in both diffusive and quantum Hall regimes makes magnetic graphene ideal for ultra-thin magnetic memory and sensory devices with applications in quantum information processing and spintronic circuitries.
[1] Ghiasi, TS, et al. Nano Letters 17, 7528 (2017)[2] Ghiasi, TS, et al. Nano Letters 19, 5959 (2019)
[3] Ghiasi, TS, et al. Nature Nanotechnology 16, 788 (2021)
[4] Ghiasi, TS, et al. arXiv:2312.07515 (2023)