Realizing a High Magnetic Moment in Gd/Cr/FeCo: The Role of the Rare   Earth
  The search for materials or systems exhibiting a high magnetic saturation has been of longstanding importance. It has been suggested that increased saturation could be achieved by coupling a transition metal via a spacer to a rare earth. We report Gd/Cr/Fe70Co30 multilayer stacks and find reduced yet modulating magnetic moment as a function of Cr thickness. Through a micro structural analysis the lowered moment is indicated by the nucleation of the ultrathin Gd films into an fcc phase. We discuss the possible solution in terms of quasi-perfect lattice match seed material to promote growth of hcp Gd. 
C. Ward, G. Scheunert, W.R. Hendren, R. Hardeman, M.A. Gubbins, R. M.   Bowman
cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.other