Get access

Effects of MOCVD Thin Cobalt Films' Structure and Surface Characteristics on their Magnetic Behavior

Authors

  • Nikolaos Papadopoulos,

    1. Laboratory of Physical Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Street, 157 80 Zografou, Athens (Greece)
    Search for more papers by this author
  • Chaido-Stefania Karayianni,

    1. Laboratory of Physical Chemistry, Section of Materials Science and Engineering, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Street, 157 80 Zografou, Athens (Greece)
    Search for more papers by this author
  • Petros Tsakiridis,

    1. Laboratory of Physical Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Street, 157 80 Zografou, Athens (Greece)
    Search for more papers by this author
  • Evangelia Sarantopoulou,

    1. National Institute of Research, Athens (Greece)
    Search for more papers by this author
  • Evangelos Hristoforou

    Corresponding author
    1. Laboratory of Physical Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Street, 157 80 Zografou, Athens (Greece)
    • Laboratory of Physical Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Street, 157 80 Zografou, Athens (Greece)
    Search for more papers by this author

  • The authors are indebted to Assoc. Prof. K. Efthimiadis, Aristotle University of Thessaloniki, Department of Physics, for his support and contribution in magnetic measurements of the films.

Abstract

Cobalt thin films are deposited by metal-organic (MO)CVD, under various experimental conditions, on Si and SiO2 substrates. The precursors used are cobalt nitrosyl tricarbonyl, Co(CO)3NO, cobalt acetylacetonate, Co(acac)2, and cobalt carbonyl, Co2(CO)8. Emphasis is given to the delivery method of each precursor, especially to a new technique of aerosol delivery. The films are thoroughly examined in terms of microstructure and surface morphology in order to establish relevance to magnetic properties. It is found that Co films deposited from Co2(CO)8 dissolved in dichloromethane are characterized by a high degree of planarity and purity, while exhibiting a non-hysteretic giant magnetoresistance (GMR) behavior in the presence of an externally applied magnetic field normal to their surface.

Ancillary