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Now showing items 21-27 of 27

  • Site-specific order and magnetism in tetragonal Mn3Ga thin films 

    SANVITO, STEFANO; COEY, JOHN MICHAEL DAVID; VENKATESAN, MUNUSWAMY; STAMENOV, PLAMEN; RODE, KARSTEN (2013)
    Mn 3 Ga bulk material and thin films deposited on several different substrates have been investigated using x-ray and neutron diffraction, x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and ...
  • Site-specific order and magnetism in tetragonal Mn3Ga thin films 

    STAMENOV, PLAMEN; SANVITO, STEFANO; VENKATESAN, MUNUSWAMY (2013)
    Mn 3 Ga bulk material and thin films deposited on several different substrates have been investigated using x-ray and neutron diffraction, x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and ...
  • SnO2 doped with Mn, Fe or Co: Room temperature dilute magnetic semiconductors 

    VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (American Institute of Physics, 2004)
    Room temperature ferromagnetism is found in (Sn1?xMx)O2 (M=Mn, Fe, Co, x=0.05) ceramics where x-ray diffraction confirms the formation of a rutile-structure phase. Room temperature saturation magnetization of 0.2 and 1.8 ...
  • Soft x-ray spectroscopic investigation of ferromagnetic Co-doped ZnO 

    LUNNEY, JAMES GERARD; MCGUINNESS, CORMAC; PATTERSON, CHARLES HUBERT; VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (American Institute of Physics, 2006)
    The electronic properties of cobalt-doped ZnO were investigated through site-selective and element-sensitive x-ray-absorption spectroscopy in the vicinity of the Co L2,3 edge, the oxygen K edge, and at the Zn L3 edge. ...
  • Superparamagnetism in MgO-based magnetic tunnel junctions with a thin pinned ferromagnetic electrode 

    COEY, JOHN MICHAEL DAVID; VENKATESAN, MUNUSWAMY (2010)
    MgO-based magnetic tunnel junctions have been fabricated with a thin Co40Fe40B20 (CoFeB) layer in the pinned synthetic antiferromagnetic CoFe/Ru/CoFeB stack. An inverted tunneling magnetoresistance is observed due to the ...
  • Tunnel magnetoresistance of disordered low-moment Co2MnSi Heusler alloy films 

    VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (American Institute of Physics, 2005)
    Thin films of Co(1?x?y)MnxSiy (x = 0.18?0.26 and y = 0.23?0.29) were deposited from elemental targets onto thermal-oxidized Si substrates at room temperature using dc magnetron cosputtering. The as-deposited films appear ...
  • Vortex states in soft magnets in two and three dimensions 

    COEY, JOHN MICHAEL DAVID; DIAO, ZHU; VENKATESAN, MUNUSWAMY (2010)
    The magnetization curves of arrays of near-spherical soft ferromagnetic particles are compared with those of quasi-two-dimensional dots with similar radius prepared by a rapid e-beam lithographic technique. Curves for the ...