Magnetostriction of permalloy epitaxial and polycrystalline thin films Taiki Ohtani, Tetsuroh Kawai, Mitsuru Ohtake and Masaaki Futamoto EPJ Web of Conferences, 40 (2013) 11004 Published online: 14 January 2013 DOI: 10.1051/epjconf/20134011004