UC Irvine

In this thesis, I describe ferromagnetic resonance measurements of magnetic anisotropy and damping in epitaxial La$_{0.7}$Sr$_{0.3}$MnO$_3$ (LSMO) and Pt capped LSMO thin films on SrTiO$_3$ (001) substrates. The measurements reveal significant negative perpendicular magnetic anisotropy and a weaker uniaxial in-plane anisotropy that both are unaffected by the Pt cap. The Gilbert damping of the bare LSMO films is found to be low $\alpha=1.9(1)\times 10^{-3}$, and two-magnon scattering is determined to be significant and strongly anisotropic in the plane of the film. The Pt cap increases the damping by 50\% due to spin pumping, which is also directly detected via inverse spin Hall effect in Pt. This work demonstrates efficient spin transport across the Pt/LSMO interface.