Explaining a Low-Temperature Magnetic Order in Annealed van der Waals Semiconductor CrSBr
Name
song-ssong64-sb-dmse-2023-thesis.pdf
Description
Thesis PDF
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48.36 MB
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Adobe PDF
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d6fdbb9ac1943abbdca43600efb197cd
Author(s)
Song, Samuel W.
Advisor(s)
Jaramillo, Rafael
Date Issued
June 2023
Publisher
Massachusetts Institute of Technology
Abstract
The van der Waals semiconductor CrSBr stands out as a promising 2D magnetic material due to its high ferromagnetic ordering temperature (135 K), near-infrared direct bandgap (1.5 eV), and stability in air. In this thesis we report on the detection of a low-temperature magnetic order in annealed CrSBr bulk single crystals using SQUID magnetometry. The order manifests as a broad bump centered at 75 K in magnetization measurements. We deduce that the order is the magnetic contribution of secondary phases, which we image and identify via SEM-EDS analysis. We determine that the secondary phase Cr₂S₃ is formed during annealing at 750°C or above and that the secondary phase CrBr₃ is also formed during annealing at 850°C.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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