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Magnetic x-ray spectroscopy of two-dimensional CrI 3 layers

DOI: 10.1016/j.matlet.2018.08.005 DOI Help

Authors: Andreas Frisk (Diamond Light Source) , Liam B. Duffy (ISIS; University of Oxford) , Shilei Zhang (University of Oxford) , Gerrit Van Der Laan (Diamond Light Source) , Thorsten Hesjedal (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Materials Letters

State: Published (Approved)
Published: August 2018
Diamond Proposal Number(s): 16162

Abstract: The recently confirmed monolayer ferromagnet CrI3 is a frisky example of a two-dimensional ferromagnetic material with great application potential in van der Waals heterostructures. Here we present a soft x-ray absorption spectroscopy study of the magnetic bulk properties of CrI3, giving insight into the magnetic coupling scenario which is relevant for understanding its thickness-dependent magnetic properties. The experimental Cr L2,3 x-ray magnetic circular dichroism spectra show a good agreement with calculated spectra for a hybridized ground state. In this high-spin Cr ground state the Cr–I bonds show a strongly covalent character. This is responsible for the strong superexchange interaction and increased spin-orbit coupling, resulting in the large magnetic anisotropy of the two-dimensionally layered CrI3 crystal.

Journal Keywords: Magnetic materials; Spectroscopy; X-ray techniques

Subject Areas: Materials, Physics

Instruments: I10-Beamline for Advanced Dichroism