Dependence of prefactor on the angle between an applied field and the easy axis for single-domain particles

Abstract The prefactor (attempt frequency) of particles with uniaxial anisotropy in an applied field at an oblique angle to the easy axis is studied systematically by calculating the smallest nonvanishing eigenvalue of the Fokker–Planck equation for several values of parameters under typical conditions in practical recording media. In the range of the damping constant 0.001–0.01, the prefactor increases with increasing the oblique angle from 0° to 30°, but for that angle of over 30° the prefactor increases very little. It is shown that the dependence of the prefactor on the energy barrier height is almost the same in the range of the oblique angle 5–60° of the applied field to the easy axis. It is confirmed that the prefactor under the conditions above takes from 10 8 to 10 10 per second.