Abstract
Finite-barrier corrections to the ferromagnetic resonance (FMR) frequency of nanomagnets are obtained in closed integral form from the undamped deterministic equation of motion of the magnetization by averaging the precession frequency as expressed by elliptic functions over all possible precessional trajectories inside a well. The method is illustrated by determining the FMR frequency for nanomagnets with both uniaxial and biaxial anisotropy subjected to a uniform external field and for nanomagnets with mixed cubic and uniaxial anisotropy. The results agree with exact numerical calculations obtained from the magnetic Langevin equation via matrix continued fractions.
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