Abstract
The longitudinal relaxation rate of the total magnetization to its equilibrium value after ultrafast demagnetization by a femtosecond laser pulse is governed by two phenomena: the homogeneous evolution of magnetization and the motion of the wavefront into the demagnetized region. If the demagnetized region is sufficiently large, the homogeneous evolution dominates. However, as the diameter of the demagnetized region decreases, the relative contribution of the wavefront increases, and in the case when a femtosecond laser pulse is focused to a diffraction-limited minimum size, the wavefront can significantly increase the longitudinal relaxation rate.
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