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Magnetic and transport properties of Co-doped Fe3O4 films D. Tripathy and A. O. Adeyeyea
 

Summary: Magnetic and transport properties of Co-doped Fe3O4 films
D. Tripathy and A. O. Adeyeyea
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering,
National University of Singapore, Singapore 117576, Singapore
C. B. Boothroyd
Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore
S. N. Piramanayagam
Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore 117608, Singapore
Received 27 June 2006; accepted 21 October 2006; published online 8 January 2007
We present a systematic study of the structural, magnetic, and magnetotransport properties of
Co-doped Fe3O4 films deposited on MgO 100 substrates by cosputtering technique. Transmission
electron microscopy images suggest that the undoped and Co-doped Fe3O4 films are polycrystalline
in nature and consist of a well defined grain boundary network. The temperature dependence of
resistance also shows that the transport mechanism in our films is dominated by electron tunneling
across antiferromagnetically coupled grain boundaries. We observed that the magnetic properties of
the doped films are markedly sensitive to the Co doping concentration, with the magnetization
curves showing drastic changes in coercivity with increasing doping concentration. In-plane
magnetoresistance curves show linear magnetic field dependence for the undoped Fe3O4 films while
a reduction in magnetoresistance and a departure from linear field dependence are observed for the
Co-doped films. 2007 American Institute of Physics. DOI: 10.1063/1.2404469

  

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

 

Collections: Physics; Materials Science