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Abstract
Transient magneto-optic Kerr effect measurement utilizing ultrafast laser pulse excitation and detection method has been performed to study the spin dynamics in epitaxial $\mathrm{Cr}{\mathrm{O}}_{2}$ film. Different microscopic contributions leading to incoherent spin thermalization and relaxation on distinct time scales have been identified in an extended three-temperature model (3TM), by taking into account the nonthermal electrons. Interestingly, the spins and thermalized electrons seemed to have been decoupled in these measurements, which could be attributed to the half-metallic nature of the material.
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