Greetings from Bangkok.
Welcome to hybrid seminars in condensed matter physics at Mahidol University. The seminars are informal and meant to inspire discussions. If you would like to participate, please sign up to receive seminar announcements or contact us at kitinan.pon@mahidol.ac.th.
The seminars start at 13:00 (Thailand time) every Wednesday, unless otherwise announced.
Upcoming Seminar
02.10.2025 (Exp.)
Speaker: Chang-woo Cho (Chungnam National University)
Time: 13:00-14:00 (Thailand time)
Venue: hybrid
Title: Microscopic Magnetic Parameters of van deer Waals CrSBr Probed by Microwave Absorption
Abstract:
The emergence of van der Waals (vdW) magnets has opened up new opportunities for studying low-dimensional magnetism and spintronic functionalities in layered systems. Among these, layered antiferromagnets such as CrI₃, CrCl₃, and CrSBr exhibit intriguing low-temperature magnetic behavior arising from alternating spin alignments between adjacent layers. In particular, CrSBr hosts a pronounced biaxial magnetic anisotropy, which not only stabilizes in-plane moment orientation but also makes it an attractive candidate for integration into spin-based electronic applications.
In this seminar, I will present our study of low-energy magnon excitations in bulk CrSBr, probed via microwave absorption spectroscopy. We investigate the magnetic field dependence of two distinct resonance modes along the three principal crystallographic axes, including fields beyond the saturation point. This reveal detailed information on the anisotropic magnetic behavior, magnetic transitions, and interlayer exchange couplings. To interpret the observed spectra, we develop a microscopic spin Hamiltonian incorporating biaxial single-ion anisotropy and interlayer exchange interactions. The model successfully reproduces the experimental magnon features and enables a quantitative determination of the key microscopic parameters governing the magnetic ground state of CrSBr.