Ferromagnetic Mn film stabilized on Al₂O₃(0001).

We report on the observation of weak ferromagnetic ordering in Mn film grown on an Al(2)O(3)(0001) substrate. The observed ferromagnetic ordering is probably due to the influence of the substrate, which forces the Mn film to be two-dimensionally stabilized under large lattice mismatch and thus leads to the modified crystal symmetry and a change in the magnetic property. In addition, a specific evolution of the magnetic properties of Mn films with respect to different growth temperatures is discussed based on the competition between different Mn phases or between different crystallographic orientations of the Mn phase. The results of our study may be helpful for forming a comprehensive understanding of Mn film at a low-dimensional level.