Spin waves in the bilayer van der Waals magnet CrSBr
Rob den Teuling (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
Ritesh Das (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
Artem V. Bondarenko (NAS of Ukraine, Kharkiv, TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
Elena V. Tartakovskaya (NAS of Ukraine, Kharkiv, Kavli institute of nanoscience Delft, Adam Mickiewicz University)
Gerrit E.W. Bauer (Tohoku University, University of Chinese Academy of Sciences)
Yaroslav M. Blanter (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
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Abstract
We derive analytical expressions for the spin-wave frequencies and precession amplitudes in monolayer and antiferromagnetically coupled bilayer CrSBr under in-plane external magnetic fields. The analysis covers the antiferromagnetic, ferromagnetic, and canted phases, demonstrating that the spin-wave frequencies in all phases are tunable by the applied magnetic field. We discuss the roles of intra- and interlayer exchange interactions, triaxial anisotropy, and intralayer dynamic dipolar fields in controlling the magnetization dynamics.