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Microscopie à Emission d'Electrons Balistiques (BEEM): étude des propriétés électroniques locales d'hétérostructures

Abstract : We developed an ultra-high vacuum ballistic electron emission microscope (BEEM) dedicated to the study of the interface electronic properties of some III-V-based heterostructures for spintronics applications. First, we investigated the epitaxial Au(110)/GaAs(001) and Fe(001)/GaAs(001) Schottky contacts. A theoretical study demonstrates that coherent hot-electron transport through the metal layer associated with transverse momentum conservation at the metal/GaAs interface are responsible for the different BEEM spectroscopic fingerprints experimentally observed for these systems. Second, BEEM investigations on the MgO/GaAs(001) tunnel contact have revealed new conduction channels localized in the band gap of MgO. These channels are related to oxygen vacancies in the oxide layer, which strongly reduce the tunnel barrier height. Finally, hot-electron magnetoresistance in the Fe/Au/Fe/GaAs(001) spin-valve system allows the observation of magnetic domains and magnetic domain walls with nanometric lateral resolution.
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https://tel.archives-ouvertes.fr/tel-00429321
Contributor : Sophie Guézo Connect in order to contact the contributor
Submitted on : Monday, November 2, 2009 - 4:55:03 PM
Last modification on : Wednesday, January 13, 2021 - 9:40:34 AM
Long-term archiving on: : Saturday, November 26, 2016 - 1:51:03 PM

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  • HAL Id : tel-00429321, version 1

Citation

Sophie Guézo. Microscopie à Emission d'Electrons Balistiques (BEEM): étude des propriétés électroniques locales d'hétérostructures. Physique [physics]. Université Rennes 1, 2009. Français. ⟨tel-00429321⟩

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