Highly crystalline core-shell FeCo-CoFe2O4 nanostructures Brigitte Paterson, Parshu Gyawali, David McKeown, Andrew Buechele, Ian L. Pegg and John Philip Eur. Phys. J. Appl. Phys., 63 3 (2013) 30401 Published online: 27 September 2013 DOI: 10.1051/epjap/2013130257