2024/05/09 by Quentin Guillet, Guillet, Quentin, H. Boukari +23 · 1 citation
Materials Science · #Magnetic and transport properties of perovskites and related materials #2D Materials and Applications #Phase-change materials and chalcogenides
paper · pdf · doi:10.48550/arxiv.2405.05689
Two-dimensional and van der Waals ferromagnets are ideal platform to study low dimensional magnetism and proximity effects in van der Waals heterostructures. Their ultimate two dimensional character offers also the opportunity to easily adjust their magnetic properties using strain or electric fields. Among 2D ferromagnets, the Cr1+xTe2 compounds with x=0-1 are very promising because their magnetic properties depend on the amount of self-intercalated Cr atoms between pure CrTe2 layers and the Curie temperature (TC) can reach room temperature for certain compositions. Here, we investigate the evolution of the composition, structural and magnetic properties of thin Cr1.33Te2 (Cr2Te3) films epitaxially grown on graphene upon annealing. We observe a transition above 450°C from the Cr1.33Te2 phase with perpendicular magnetic anisotropy and a TC of 180 K to a composition close to Cr1.39Te2 with in-plane magnetic anisotropy and a TC of 240-250 K. This phase remains stable up to 650°C above which a pure Cr film starts to form. This work demonstrates the complex interplay between intercalated Cr, lattice parameters and magnetic properties in Cr1+xTe2 compounds.