Van der Waals Spin Valves

Abstract

We propose spin valves where a 2D nonmagnetic conductor is intercalated between two ferromagnetic insulating layers. In this setup, the relative orientation of the magnetizations of the insulating layers can have a strong impact on the in-plane conductivity of the 2D conductor. We first show this for a graphene bilayer, described with a tight-binding model, placed between two ferromagnetic insulators. In the antiparallel configuration, a band gap opens at the Dirac point, whereas in the parallel configuration, the graphene bilayer remains conducting. We then compute the electronic structure of graphene bilayer placed between two monolayers of the ferromagnetic insulator CrI_{3}, using density functional theory. Consistent with the model, we find that a gap opens at the Dirac point only in the antiparallel configuration.

Orbitally-resolved ferromagnetism of monolayer CrI3

“…Most of them were based on first-principles calculations (density functional theory and beyond) with direct mapping on the Heisenberg model. Being a standard approach in material science, such method allows one to describe the macroscopic quantities (e.g., the Curie temperature) with reasonable accuracy [25][26][27].…”

Self-consistent description of a spherically-symmetric gravitational collapse

“…[20] without using the Einstein equations. Hence, it will hold in any metric theory, e.g., in f(R) theories [15,27], in the vicinity of the hypersurfaces f (t, r) = 0. From now on, we assume that dynamics is described by the standard Einstein equations.…”

“…Quantum effects and uncertainty regarding the end result of the collapse [8][9][10] motivate investigations of exotic compact objects (ECOs) that do not lead to formation of an event horizon and/or singularity. Advances in instrumentation make studies of spacetime close to ABHs possible [11], focusing attention on the observational differences between ECO and conventional black holes [7,8,[12][13][14][15].…”

Two-dimensional van der Waals spinterfaces and magnetic-interfaces

“…Importantly, the short-range nature of proximity effects results in the creation of a large exchange field mostly within the outermost 2D layer that is in direct contact with the magnetic material 53,54 . The latter opens opportunities for the creation of synthetic spin-valve structures based on non-magnetic 2D materials 55 .…”