A long spin-lifetime of electrons is the holy grail of spintronics, a field exploiting the electron angular momentum as information carrier and storage unit. Previous reports indicated a spin lifetime, τs near 10 ns at best in graphene-based devices at low temperatures. We detail the observation of τs approaching the ultralong 1,000~ns at room temperature in natural graphite crystals using magnetic resonance spectroscopy. The relaxation time shows a giant anisotropy: the lifetime of spins, polarized perpendicular to the graphite plane, is more than 50 times longer than for the in-plane polarization. The temperature dependence of τs proves that diffusion of spins to the crystallite edges, where relaxation occurs, limits the lifetime. This suggests that graphite is an excellent candidate for spintronic applications, seamlessly integrating with emerging 2D van der Waals technologies.
@article{arxiv.2503.07899,
title = {Unprecedented Spin-Lifetime of Itinerant Electrons in Natural Graphite Crystals},
author = {Bence G. Márkus and Dávid Beke and Lili Vajtai and András Jánossy and László Forró and Ferenc Simon},
journal= {arXiv preprint arXiv:2503.07899},
year = {2026}
}