Browsing by Author "Donath, M"

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    Characterisation and application of a SPLEED-based spin polarisation analyser
    (Elsevier, 2007-12-15) Yu, DH; Math, C; Meier, M; Escher, M; Rangelov, G; Donath, M
    A commercial electron spin analyser, based on spin-polarised low-energy electron diffraction (SPLEED) from W(100), has been characterised with incident polarised electron beams from a standard GaAs polarised electron source. The dependence of the Sherman function on the scattering energy and elapse time after CO-flash of the tungsten crystal of the analyser have been measured. The influence of the stray magnetic field on the performance of the analyser has been investigated. The spin analyser has been applied in monitoring the reorientation transition of the easy magnetisation direction of Fe films on W(110) upon the exposure of CO adsorbent on the surface. © 2007, Elsevier Ltd.
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    Quantum-well states and spin polarization in thin Ni films on Cu(001)
    (Elsevier, 2007-12-15) Renken, V; Yu, DH; Donath, M
    The unoccupied quantum-well states in thin Ni films on Cu(001) have been studied by spin- and angle-resolved inverse photoemission. Three quantum-well features are clearly resolved with exchange splittings of up to 70meV. As a function of the wave vector parallel to the surface, the quantum-well states follow the corresponding sp band dispersion and evolve into surface resonances upon approaching the band-gap boundary. © 2007, Elsevier Ltd.
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    Spin polarised quantum-well states in layered magnetic nanostructures of Cu/Co/Cu(100)
    (Australian Institute of Physics, 2004-02-04) Yu, DH; Donath, M
    The unoccupied electronic structures of bilayer Co/Cu(100) and trilayer Cu/Co/Cu(100) structures have been investigated by spin-resolved inverse photoemission. For the first time, the spin-polarised unoccupied quantum-well states have been observed for both systems. The exchange splitting of the quantum-well states and the bulk-like sp band of Co (100) have been determined. A simple phase accumulation model simulated the electron confinement in the ultra-thin Co(100) film very well. The offset between the Co and Cu X4’ point provides the confinement potential for electrons in the Co film. For the sandwich structure of Cu/Co/Cu(100), in addition to the spin-polarised quantum-well states, surface states and a surface resonant state at the copper/vacuum interface, and bulk-like minority d contributions from the underlying ferromagnetic Co layer have also been identified. The quantum-well states are shown to develop into a surface resonant state as a function of the electron momentum, as evidenced by the loss of the exchange splitting. The quantum-well states in Cu/Co structure are formed by resonance due to high reflectivity, because there is no absolute confinement potential for this structure. The experiment has shown that the spin resolution provides a possible access to the penetration depth of the wave function of the surface state and surface resonant state.