Summary: Effect of cobalt doping concentration on the structural and magnetic
properties of Fe3O4
D. Tripathy a
, A.O. Adeyeye a,*, S.N. Piramanayagam b
, C.S. Mah b
, Xingyu Gao c
, A.T.S. Wee c
a
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering, NUS, 4 Engineering Drive 3, 117576 Singapore
b
Data Storage Institute, DSI Building, 5 Engineering Drive 1, 117608 Singapore
c
Department of Physics, NUS, 2 Science Drive 3, 117542 Singapore
Available online 23 November 2005
Abstract
In this work, we investigate the effects of cobalt doping on the structural, magnetic and transport properties of half metallic Fe3O4 films
fabricated on MgO (100) substrates by co-sputtering. The doped films exhibit a highly broadened metal­insulator Verwey transition as compared
to that of undoped Fe3O4 films. The magnetic and transport properties of the doped films are markedly sensitive to the Co doping concentration;
films with high Co doping exhibit almost negligible coercivity at room temperature. Magnetoresistance (MR) curves show linear magnetic field
dependence for the undoped films, while a reduction in MR and departure from linear field dependence is observed for Co-doped films.

Source: Adeyeye, Adekunle - Department of Electrical and Computer Engineering, National University of Singapore

Collections: Physics; Materials Science