Strain-induced magnetic properties of Pr0.67Sr0.33MnO3 thin films

We report the temperature dependence of the magnetic anisotropy in both com pressive and tensile strained films of Pr0.67Sr0.33MnO3 (PSMO). Compressive strain induced by growth on LaAlO3 (LAO) substrates results in a spontaneo us out-of-plane magnetization, while tensile strain (grown on SrTiO3) resul ts in in-plane magnetization. The coefficient of linear proportionality bet ween the magnetic anisotropy energy and the tetragonal strain for both comp ressive and tensile strained PSMO films is larger than that found previousl y in strained La0.67Ca0.33MnO3 films. From the data, we estimate a 20 unit- cell magnetic domain wall width for PSMO/ LAG. Scattering from such a narro w domain wall could produce a potentially significant contribution to the r esistivity.