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Browsing by Author "Maat, S."

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    Magnetization Relaxation and Structure of CoFeGe Alloys
    (2009) Lee, H.; Wang, Y.-H. A.; Mewes, C. K. A.; Butler, W. H.; Mewes, T.; Maat, S.; York, B.; Carey, M. J.; Childress, J. R.; University of Alabama Tuscaloosa
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    Testing Epitaxial Co1.5FeGe(001) Electrodes in MgO-based Magnetic Tunnel Junctions
    (2014) Neggache, A.; Hauet, T.; Bertran, F.; Fèvre, P. Le; Petit-Watelot, S.; Devolder, T.; Ohresser, P.; Boulet, P.; Mewes, C.; Maat, S.; Childress, J. R.; Andrieu, S.; University of Alabama Tuscaloosa
    The ability of the full Heusler alloy Co1.5Fe1.5Ge(001) (CFG) to be a Half-Metallic Magnetic (HMM) material is investigated. Epitaxial CFG(001) layers were grown by molecular beam epitaxy. The results obtained using electron diffraction, X-ray diffraction, and X-ray magnetic circular dichroism are consistent with the full Heusler structure. The pseudo-gap in the minority spin density of state typical in HMM is examined using spin-resolved photoemission. Interestingly, the spin polarization found to be negative at EF in equimolar CoFe(001) is observed to shift to positive values when inserting Ge in CoFe. However, no pseudo-gap is found at the Fermi level, even if moderate magnetization and low Gilbert damping are observed as expected in HMM materials. Magneto-transport properties in MgO-based magnetic tunnel junctions using CFG electrodes are investigated via spin and symmetry resolved photoemission.