Explaining a Low-Temperature Magnetic Order in Annealed van der Waals Semiconductor CrSBr

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.

Name thesis:degree_name

Bachelor

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Materials Science and Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2023

Author dc:creator

• Song, Samuel W.

Advisor dc:contributor.advisor

• Jaramillo, Rafael

Statement dc:rights

• In Copyright - Educational Use Permitted
• Copyright retained by author(s)

Licence dc:rights.uri

• https://rightsstatements.org/page/InC-EDU/1.0/

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/154163

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/154163