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Article Dans Une Revue Applied Physics Letters Année : 2014

Testing epitaxial Co1.5Fe1.5Ge(001) electrodes in MgO-based magnetic tunnel junctions

Amina Neggache
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Thomas Hauet
F. Bertran
P. Le Fevre
S. Petit-Watelot
P. Ohresser
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Pascal Boulet
Stéphane Andrieu

Résumé

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 E-F 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.
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Dates et versions

hal-01282862 , version 1 (13-07-2016)

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Amina Neggache, Thomas Hauet, F. Bertran, P. Le Fevre, S. Petit-Watelot, et al.. Testing epitaxial Co1.5Fe1.5Ge(001) electrodes in MgO-based magnetic tunnel junctions. Applied Physics Letters, 2014, 104 (25), pp.252412. ⟨10.1063/1.4885354⟩. ⟨hal-01282862⟩
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