Tracking magnons, spin flips, and spin canting with magneto-Raman spectroscopy in atomically thin CrI<sub>3</sub>

The discovery of 2-dimensional (2D) materials, such as CrI₃, that retain magnetic ordering at monolayer thickness has resulted in a surge of both pure and applied research in 2D magnetism. Here, we report a magneto-Raman spectroscopy study on multilayered CrI₃, focusing on two additional features in the spectra that appear below the magnetic ordering temperature and were previously assigned to high frequency magnons. Instead, we conclude these modes are actually zone-folded phonons. We observe a striking evolution of the Raman spectra with increasing magnetic field applied perpendicular to the atomic layers in which clear, sudden changes in intensities of the modes are attributed to the interlayer ordering changing from antiferromagnetic to ferromagnetic at a critical magnetic field. Spin canting by applying the magnetic field parallel to the atomic layers is also investigated. Our work highlights the sensitivity of the Raman modes to weak interlayer spin ordering in CrI₃.

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Bulletin of the American Physical Society

APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session R57: 2D Semiconductors: Spectroscopy

Abstract: R57.00001 : Tracking magnons, spin flips, and spin canting with magneto-Raman spectroscopy in atomically thin CrI3

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Abstract: R57.00001 : Tracking magnons, spin flips, and spin canting with magneto-Raman spectroscopy in atomically thin CrI₃