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Now showing items 140-151 of 151

  • Thick film permanent magnets by membrane electrodeposition 

    COEY, JOHN MICHAEL DAVID (American Institute of Physics, 2005)
    Thick films of nearly equiatomic Co?Pt produced by electrodeposition into nanoporous membranes exhibit an isotropic magnetic phase with square hysteresis loops (Mr/Ms = 0.95) and coercivity of up to 1.3 T. The initial ...
  • Three-state dual spin valve structure 

    COEY, JOHN MICHAEL DAVID (2010)
    A dual spin valve is built with exchange bias on the top and bottom pinned layers and a central free layer. By suitable choice of the antiferromagnetic and ferromagnetic layer thicknesses, it is possible to separate the ...
  • Torque in nested Halbach cylinders 

    WEAIRE, DENIS LAWRENCE; COEY, JOHN MICHAEL DAVID (IEEE, 1999)
    Permanent magnet variable flux sources are produced by rotating two nested N-segment, permanent magnet, Halbach cylinders. Torque is primarily an end effect, determined by field non-uniformities due to the fmite length ...
  • Torque in nested Halbach cylinders 

    Ni Mhiochain, T.R; WEAIRE, DENIS LAWRENCE; MCMURRY, SARA; COEY, JOHN MICHAEL DAVID (IEEE, 1999)
  • Torque in nested Halbach cylinders 

    Ni Mhiochain, T.R.; WEAIRE, DENIS LAWRENCE; MCMURRY, SARA; COEY, JOHN MICHAEL DAVID (IEEE, 1999)
  • Transport characteristics of magnetite thin films grown onto GaAs substrates 

    VAN, DIJKEN SEBASTIAN; COEY, JOHN MICHAEL DAVID (IEEE, 2004)
    Magnetite thin films with a preferred (111) orientation have been deposited by reactive dc magnetron sputtering from a pure Fe target onto (100) GaAs substrates at 400??C. The films show a clear Verwey transition in both ...
  • Transport properties of Bi2Sr2Can-1CunO2 n+4 thin films 

    COEY, JOHN MICHAEL DAVID (American Physical Society, 1994)
    The Hall effect and resistivity have been measured in Bi2Sr2Can-1CunO2n+4 (n=2 and 3) thin films as a function of magnetic field and temperature. In the normal state, the ratio of the normal resistivity to the Hall resistivity ...
  • 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 ...
  • Tunneling processes in asymmetric double barrier magnetic tunnel junctions with a thin top MgO layer 

    COEY, JOHN MICHAEL DAVID (2013)
    Dynamic conductance dI/dV and inelastic electron tunneling spectroscopy (IETS) d 2I/dV 2 have been measured at different temperatures for double barrier magnetic tunnel junctions with a thin top MgO layer. The resistance ...
  • Vector vibrating-sample magnetometer with permanent magnet flux source 

    COEY, JOHN MICHAEL DAVID (American Institute of Physics, 2006)
    A compact magnetometer, which uses two nested 1?T Halbach cylinders to generate a variable magnetic field of up to 2?T in any direction in the xy plane, has two sets of quadrupole pickup coils to detect the components mx ...
  • Very low 1/f barrier noise in sputtered MgO magnetic tunnel junctions with high tunneling magnetoresistance 

    COEY, JOHN MICHAEL DAVID (2012)
    Low frequency 1/f barrier noise has been investigated in sputtered MgO magnetic tunnel junctions(MTJs) with a tunnelingmagnetoresistance ratio of up to 330% at room temperature. The lowest normalized noise parameter ? of ...
  • 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 ...