Abstract
Optically excited uniform magnetization precession in the ferromagnetic state of ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ films grown on different substrates is investigated by the time-resolved magneto-optic Kerr effect. The parameters of magnetic anisotropy are determined from the measured field dependence of the precession frequency. The dominant anisotropy contribution in the film grown on ${\mathrm{SrTiO}}_{3}\phantom{\rule{0.3em}{0ex}}(001)$ is the strain-induced easy-plane anisotropy. In the strain-free films on ${\mathrm{NdGaO}}_{3}\phantom{\rule{0.3em}{0ex}}(110)$, we discover a uniaxial in-plane anisotropy that results from the interface due to the tilting of the oxygen octahedra in ${\mathrm{NdGaO}}_{3}$.
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