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Proceedings Paper

Electron transmission through ultrathin metal layers and its spin dependence for magnetic structures
Author(s): Henri-Jean Drouhin; G. Lampel; Y. Lassailly; A. J. van der Sluijs; C. Marliere
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Paper Abstract

We present a new set of experiments in which the attenuation of a `monoenergetic', possibly spin-polarized, free-electron beam is measured by direct transmission through an ultra-thin metal layer. The self-supported metal target is either a reference gold sample or a ferromagnetic structure. The overall thickness is of the order of 25 nm. The magnetic structure consists of a 1 nm-thick cobalt film sandwiched between 21 and 2 nm-thick gold layers, with perpendicular magnetization. Measurements are performed throughout a wide energy range, with incident electron energies between 2 and 1000 eV above the Fermi level. The transmission of the gold layer is found to be substantially higher than that of the magnetic structure. In the latter case, at low energy, close to the clean surface vacuum level, we find that the majority spin electrons are more easily transmitted than the minority spin electrons. Cesium deposition on the exit side or on both sides of the target increases the overall transmitted current by almost an order of magnitude. In the case of the magnetic structure, this also increases the transmission spin-asymmetry from 16 to about 40%. Such structures appear to be well-suited to the construction of convenient and compact spin-detectors.

Paper Details

Date Published: 24 April 1995
PDF: 11 pages
Proc. SPIE 2397, Optoelectronic Integrated Circuit Materials, Physics, and Devices, (24 April 1995); doi: 10.1117/12.206906
Show Author Affiliations
Henri-Jean Drouhin, Ecole Polytechnique (France)
G. Lampel, Ecole Polytechnique (France)
Y. Lassailly, Ecole Polytechnique (France)
A. J. van der Sluijs, Ecole Polytechnique (France)
C. Marliere, Institut d'Optique Theorique et Appliquee (France)

Published in SPIE Proceedings Vol. 2397:
Optoelectronic Integrated Circuit Materials, Physics, and Devices
Manijeh Razeghi; Yoon-Soo Park; Gerald L. Witt, Editor(s)

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