Wu Han-Chun, Mauit Ozhet, Coileáin Cormac Ó, Syrlybekov Askar, Khalid Abbas, Mouti Anas, Abid Mourad, Zhang Hong-Zhou, Abid Mohamed, Shvets Igor V
1] School of Physics, Beijing Institute of Technology, Beijing, 100081, P. R. China [2] KSU-Aramco Center, King Saud University, Riyadh 11451, Saudi Arabia.
CRANN, School of Physics, Trinity College, Dublin 2, Ireland.
Sci Rep. 2014 Nov 12;4:7012. doi: 10.1038/srep07012.
Magnesium ferrite is a very important magnetic material due to its interesting magnetic and electrical properties and its chemical and thermal stability. Here we report on the magnetic and transport properties of epitaxial MgFe2O4 thin films grown on MgO (001) by molecular beam epitaxy. The structural properties and chemical composition of the MgFe2O4 films were characterized by X-Ray diffraction and X-Ray photoelectron spectroscopy, respectively. The nonsaturation of the magnetization in high magnetic fields observed for M (H) measurements and the linear negative magnetoresistance (MR) curves indicate the presence of anti-phase boundaries (APBs) in MgFe2O4. The presence of APBs was confirmed by transmission electron microscopy. Moreover, post annealing decreases the resistance and enhances the MR of the film, suggesting migration of the APBs. Our results may be valuable for the application of MgFe2O4 in spintronics.
由于其有趣的磁学和电学性质以及化学和热稳定性，铁酸镁是一种非常重要的磁性材料。在此，我们报告通过分子束外延在MgO(001)上生长的外延MgFe2O4薄膜的磁学和输运性质。MgFe2O4薄膜的结构性质和化学成分分别通过X射线衍射和X射线光电子能谱进行表征。在M(H)测量中观察到的高磁场下磁化强度的不饱和以及线性负磁阻(MR)曲线表明MgFe2O4中存在反相界(APB)。通过透射电子显微镜证实了APB的存在。此外，后退火降低了薄膜的电阻并增强了其磁阻，表明APB发生了迁移。我们的结果对于MgFe2O4在自旋电子学中的应用可能具有重要价值。
