Browsing by Author "COEY, JOHN MICHAEL DAVID"
Now showing items 90-102 of 102
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Size-dependent scaling of perpendicular exchange bias in magnetic nanostructures
(American Physical Society, 2007)Size-dependent scaling is studied in exchange biased nanostructures obtained by depositing Pt/Co 3 /IrMn multilayers with perpendicular magnetization onto an array of monodisperse polystyrene nanospheres with a diameter ... -
SnO2 doped with Mn, Fe or Co: Room temperature dilute magnetic semiconductors
(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 ... -
Spin scattering in ferromagnetic thin films
(American Physical Society, 1996)By combining parallel and transverse magnetoresistance measurements on thin films of Co and Ni, the contribution of spin scattering at the domain walls is separated from the anisotropic magnetoresistance (AMR). A model, ... -
Spin-dependent tunneling spectroscopy in MgO-based double-barrier magnetic tunnel junctions
(2012)We investigated the dynamic conductance and inelastic electron tunneling spectroscopy in MgO-based double barrier magnetic tunnel junctions with Co 50 Fe 50 /Co 40 Fe 40 B 20 hybrid free layers. The tunneling ... -
Temperature dependence of inverted tunneling magnetoresistance in MGO-based magnetic tunnel junctions
(2010)MgO-based magnetic tunnel junctions (MTJs) of the following main structure: Ir22Mn78 (10 nm) /Co90Fe10 (2 nm) /Ru (0.85 nm) /CoFeB (0.5t<2 nm) /MgO (2.5 nm) /CoFeB (3 nm) have been fabricated, with a thin CoFeB layer in ... -
Thick film permanent magnets by membrane electrodeposition
(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 ... -
Torque in nested Halbach cylinders
(IEEE, 1999) -
Torque in nested Halbach cylinders
(IEEE, 1999) -
Torque in nested Halbach cylinders
(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 ... -
Transport characteristics of magnetite thin films grown onto GaAs substrates
(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
(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
(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
(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 ...
