Segmented Band Mechanism for Itinerant Ferromagnetism
  We introduce a novel mechanism for itinerant ferromagnetism, which is based on a simple two-band model, and using numerical and analytical methods, we show that the Periodic Anderson Model (PAM) contains this mechanism. We propose that the mechanism, which does not assume an intra-atomic Hund's coupling, is present in both the iron group and some $f$ electron compounds. 
C. D. Batista, J. Bon\v{c}a, and J. E. Gubernatis