Ferrimagnetism and spontaneous ordering of transition-metals in   La2CrFeO6 double-perovskite films
  We report on atomic ordering of B-site transition-metals and magnetic properties of epitaxial La2CrFeO6 double-perovskite films grown by pulsed-laser deposition under various conditions. The highest ordered sample exhibited a fraction of antisite-disorder of only 0.05 and a saturation magnetization of ~2\mu_{B} per formula unit at 5 K. The result is consistent with the antiferromagnetic ordering of local spin moment (3d^{3}_{\downarrow}3d^{5}_{\uparrow}; S = -3/2+5/2 = 1). Therefore, the magnetic ground state of La2CrFeO6 double-perovskite that has been long debate is unambiguously revealed to be ferrimagnetic. Our results present a wide opportunity to explore novel magnetic properties of binary transition-metal perovskites upon epitaxial stabilization of the ordered phase. 
S. Chakraverty, A. Ohtomo, D. Okuyama, M. Saito, M. Okude, R. Kumai,   T. Arima, Y. Tokura, S. Tsukimoto, Y. Ikuhara, and M....
cond-mat.mtrl-sci