Magnetic correlations in the quasi-two-dimensional semiconducting ferromagnetCrSiTe3

Abstract

Intrinsic, two-dimensional ferromagnetic semiconductors are an important class of materials for overcoming the limitations of dilute magnetic semiconductors for spintronics applications. CrSiTe3 is a particularly interesting member of this class, since it can likely be exfoliated down to single layers, where TC is predicted to increase dramatically. Establishing the nature of the magnetism in the bulk is a necessary precursor to understanding the magnetic behavior in thin film samples and the possible applications of this material. In this work, we use elastic and inelastic neutron scattering to measure the magnetic properties of single crystalline CrSiTe3. We find that there is a very small single ion anisotropy favoring magnetic ordering along the c-axis and that the measured spin waves fit well to a model where the moments are only weakly coupled along that direction. Finally, we find that both static and dynamic correlations persist within the ab-plane up to at least 300 K, strong evidence of this material's two-dimensional characteristics that are relevant for future studies on thin film and monolayer samples.

High-temperature ferromagnetic semiconductors: Janus monolayer vanadium trihalides

“…Two-dimensional materials provide a crucial platform to investigate novel physics and show tremendous application prospects in spintronic and flexible devices due to their greater conductivity and tunability compared with the traditional bulk materials. [1][2][3][4][5] However, two aspects are considered to limit the progress in spintronics. The one is the scanty materials possessing ferromagnetic (FM) order and semiconducting properties.…”

Electrically tunable exchange splitting in bilayer graphene on monolayer Cr2X2Te6 with X = Ge, Si, and Sn

“…Several ferromagnetic insulators (FMI), like EuO and Yttrium-Iron-Garnet, have been considered in the context of graphene spintronics [22,[31][32][33][34]. However transition-metal trichalcogenides Cr 2 Si 2 Te 6 , Cr 2 Ge 2 Te 6 (CGT), and transition-metal trihalides CrI 3 , and their monolayers are now extensively discussed in literature as promising materials for low-dimensional spintronics because of their FMI ground state properties [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]. These materials have attracted attention as substrates for topological insulators (TI) [49,50] and graphene [27], because ferromagnetic coupling is present.…”

Strong spin-lattice coupling in CrSiTe3

“…This approximate value is reasonably close to the ⟨S i · S j ⟩=2.8733 extracted from low temperature neutron scattering. 42 Once ⟨S i · S j ⟩ is determined, the λ's can be calculated.…”