Temperature dependent study of magnetization dynamics in CrCl₃ – a layered antiferromagnet

Chromium trichloride (CrCl₃) is a layered antiferromagnet. Recently it has found renewed interest due to its antiferromagnetic resonance in GHz frequencies, two-dimensional (2D) layered structure with low cleavage energy and complex magnetization dynamics [1]. We report a detailed study of magnetization dynamics of bulk CrCl₃ placed on a coplanar waveguide (CPW) as a function of temperature. We observe prominent ferromagnetic, antiferromagnetic and paramagnetic resonances depending on temperature and in-plane magnetic field. We also observe magnon-magnon coupling and presence of multiple spin-wave modes by introducing an additional out-of-plane magnetic field by tilting the sample with respect to magnetic field direction. We extract useful system parameters and study their dependence on temperature and angle of tilting by fitting to experimental data. Ability to easily exfoliate 2D layers of CrCl₃ opens up possibility of coupling it to CPW resonators and application in antiferromagnetic spintronics and hybrid quantum systems.

Reference:
[1] D. MacNeill, J.T. Hou, D.R. Klein, P. Zhang, P. Jarillo-Herrero, and L. Liu, Phys. Rev. Lett. 123, 047204 (2019).