Kavli Affiliate: Daniel C. Ralph
| First 5 Authors: Thow Min Cham, Saba Karimeddiny, Avalon H. Dismukes, Xavier Roy, Daniel C. Ralph
| Summary:
We report measurements of gigahertz-frequency antiferromagnetic resonances
that are anisotropic as a function of the direction of applied magnetic field
relative to the crystal axes in the van der Waals easy-axis antiferromagnet
CrSBr. We map the resonance frequencies as function of the magnitude and angle
of an applied magnetic field, which allows us to identify different modes in
the low and high-field regimes. The spectra show good agreement with a
Landau-Lifshitz model for two antiferromagnetically-coupled sublattices,
accounting for inter-layer exchange and triaxial magnetic anisotropy. Fits
allow us to quantify the parameters governing the magnetic dynamics: at 5 K,
the interlayer exchange field is $mu_0 H_E =$ 0.395(2) T, and the hard and
intermediate-axis anisotropy parameters are $mu_0 H_c =$ 1.30(2) T and $mu_0
H_a =$ 0.383(7) T. The existence of within-plane anisotropy makes it possible
to control the degree of hybridization between the antiferromagnetic resonances
using an in-plane magnetic field.
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