Structure and magnetism in ultrathin iron oxides characterized by low   energy electron microscopy
  We have grown epitaxial films a few atomic layers thick of iron oxides on ruthenium. We characterize the growth by low energy electron microscopy. Using selected area diffraction and intensity vs. voltage spectroscopy, we detect two distinct phases which are assigned to wustite and magnetite. Spin polarized low energy electron microscopy shows magnetic domain patterns in the magnetite phase at room temperature. 
Benito Santos, Elena Loginova, Arantzazu Mascaraque, Andreas K Schmid,   Kevin F McCarty, Juan de la Figuera