Inertial spin waves in spin spirals
Physical Review B(2024)
摘要
Inertial effects in spin dynamics emerge on picosecond time scales, giving
rise to nutational excitations at THz frequencies. Here, we describe a general
framework for investigating the precessional and nutational excitations in any
type of spin structure within linear spin-wave theory. We consider the
particular cases of planar and conical spin spirals in detail. We observe a
change in the sign of the curvature of the high-frequency nutational spin-wave
band as the spiral period is decreased when passing from the ferromagnetic to
the antiferromagnetic limit. We identify conditions for the interaction
parameters where the curvature changes sign and asymptotical flat bands are
formed.
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