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Probing and controlling magnetic ground states in van der Waals antiferromagnet CrSBr
Wednesday 05 February 2025, 12:01pm

Dr. Amit Sharad Pawbake, Laboratoire National des Champs Magnétique Intenses, CNRS

Location : AB2-5B
Abstract: Magnetic excitations in an air-stable layered magnetic material CrSBr, that can be thinned down to the two-dimensional (2D) monolayer limit, are of high interest from a fundamental point of view and for applications perspectives [1-2]. In this work, we investigate the magnetization process of a biaxial antiferromagnet CrSBr in an external magnetic field applied along the easy axis and study the elementary excitations.
We performed a microwave absorption study of the low-energy magnon excitations in bulk CrSBr. The magnetic-field dependence of two resonance modes is measured up to well above the saturation fields, revealing anisotropies, magnetic transitions, and a strong magnon-magnon coupling in this material [3]. Magneto-Raman scattering spectroscopy unveils robust spin-lattice coupling, evident in the emergence of new zone folded phonon modes when the additional magnetic periodicity develops below TN and by pronounced variations of the scattered intensity [4].
Further, with hydrostatic pressure, we modify the competition between exchange interactions and magnetocrystalline anisotropy. We find that the single meta-magnetic transition of the Ising type observed in this material under ambient pressure transforms under hydrostatic pressure into two transitions, a first-order spin-flop transition followed by a second-order transition toward a polarized ferromagnetic state near saturation. This reversible tuning into a new magnetic phase is obtained in layered bulk CrSBr at low temperature by varying the interlayer distance using high hydrostatic pressure, which efficiently acts on the interlayer magnetic exchange and is probed by magneto-optical spectroscopy [5].

References:
[1] E. Telford et.al, Adv. Mater. 32, 2003240 (2020)
[2] N. Wilson et.al, Nat. Mater. 20, 1657 (2021)
[3] C. Cho et.al, Phys. Rev. B 107, 094403 (2023)
[4] A. Pawbake et.al, Phys. Rev. B. 107, 075421 (2023)
[5] A. Pawbake et.al, Nano Lett. 23, 9587 (2023)

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