Browsing School of Physics by Author "DIAO, ZHU"

Now showing items 1-7 of 7

    • Influence of magnetic field on hydrogen reduction and co-reduction in the Cu/CuSO4 system 

      COEY, JOHN; FERNANDEZ, DAMARIS; DIAO, ZHU; DUNNE, PETER (2010)
      The effects of an applied magnetic field of up to 5 T on hydrogen evolution and cathodic overpotential were studied for H2SO4 and an acidic Cu/CuSO4 system. Cyclic voltammetry, potentiostatic and galvanostatic deposition ...

    • Magnetic noise in MgO-based magnetic tunnel junction rings 

      COEY, JOHN; FENG, JIA-FENG; DIAO, ZHU (2010)
      Magnetization switching is investigated in ring-shaped MgO-based magnetic tunnel junctions with 168% tunneling magnetoresistance. Besides the forward and reverse onion states, two vortex states and several metastable ...

    • Magnetic noise in structured hard magnets 

      COEY, JOHN MICHAEL DAVID; DIAO, ZHU (2010)
      The anomalous Hall effect of wires patterned from ?Co90Fe10=Pt?n multilayers, with 10 n 50, is used to determine the magnetization process in a small volume of maze domains. Time-independent 1=f noise appears in ...

    • Magnetic noise in structured hard magnets 

      COEY, JOHN; DIAO, ZHU (2010)
      The anomalous Hall effect of wires patterned from ?Co90Fe10=Pt?n multilayers, with 10 n 50, is used to determine the magnetization process in a small volume of maze domains. Time-independent 1=f noise appears in ...

    • Magnetic Properties of Exchange-Biased [Co/Pt](n) Multilayer With Perpendicular Magnetic Anisotropy 

      COEY, JOHN; FENG, JIA-FENG; DIAO, ZHU (2010)
      Perpendicular exchange-biased [Co/Pt](3)/Co(t(Co))/IrMn and IrMn/Co(t(Co))/Pt/[Co/Pt](3) multilayers have been fabricated, changing the thickness (t(Co)) of the cobalt that is next to the IrMn layer. The crystal structure, ...

    • Reduced low frequency noise in electron beam evaporated MgO magnetic tunnel junctions 

      COEY, JOHN; FENG, JIA-FENG; DIAO, ZHU; KURT, HUSEYIN (2010)
      We compare low frequency noise in magnetic tunnel junctions with MgO barriers prepared by electron-beam evaporation with those prepared by radiofrequency sputtering, both showing a high tunneling magnetoresistance. The ...

    • 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 ...