Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides.

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Date: June 4, 2019
Publisher: National Academy of Sciences
Document Type: Article
Length: 4,572 words
Lexile Measure: 1440L

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Abstract :

We conduct a comprehensive study of three different magnetic semiconductors, Cr[I.sub.3], Cr[Br.sub.3], and Cr[Cl.sub.3], by incorporating both few-layer and bilayer samples in van der Waals tunnel junctions. We find that the interlayer magnetic ordering, exchange gap, magnetic anisotropy, and magnon excitations evolve systematically with changing halogen atom. By fitting to a spin wave theory that accounts for nearest-neighbor exchange interactions, we are able to further determine a simple spin Hamiltonian describing all three systems. These results extend the 2D magnetism platform to Ising, Heisenberg, and XY spin classes in a single material family. Using magneto-optical measurements, we additionally demonstrate that ferromagnetism can be stabilized down to monolayer in more isotropic Cr[Br.sub.3], with transition temperature still close to that of the bulk. 2D magnetism | chromium trihalides | tunneling spectroscopy

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Gale Document Number: GALE|A591395942