Investigation of Co$_2$FeSi: The Heusler compound with Highest Curie   Temperature and Magnetic Moment
  This work reports on structural and magnetic investigations of the Heusler compound Co$_2$FeSi. X-Ray diffraction and M\"o\ss bauer spectrometry indicate an ordered $L2_1$ structure. Magnetic measurements by means of X-ray magnetic circular dichroism and magnetometry revealed that this compound is, currently, the material with the highest magnetic moment ($6 \mu_B$) and Curie-temperature (1100K) in the classes of Heusler compounds as well as half-metallic ferromagnets. 
Sabine Wurmehl, Gerhard H. Fecher, Hem Chandra Kandpal, Vadim   Ksenofontov, Claudia Felser, and Hong-Ji Lin