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Magnetic quantum well states in ultrathin film and wedge structures

By D. Li and S. D. Bader

Abstract

Magnetic quantum-well (QW) states are probed with angle- and spin-resolved photoemission to address critical issues pertaining to the origin of the giant magnetoresistance (GMR) optimization and oscillatory coupling of magnetic multilayers. Two epitaxial systems are highlighted: Cu/Co(wedge)/Cu(100) and Cr/Fe(100)-whisker. The confinement of Cu sp-QW states by a Co barrier requires a characteristic Co thickness of 2.2 {+-} 0.6 {angstrom}, which is consistent with the interfacial Co thickness reported to optimize the GMR of permalloy-Cu structures. The controversial k-space origin of the 18-{angstrom} long period oscillation in Fe/Cr multilayers is identified by the vector that spans the d-derived lens feature of the Cr Fermi surface, based on the emergence of QW states with 17 {+-} 2 {angstrom} periodicity in this region

Topics: Copper, Magnetoresistance, Fermi Level, 36 Materials Science, Layers, Cobalt, Thin Films, Electron Spectroscopy, Composite Materials, Experimental Data, Iron, Heterojunctions, Chromium
Publisher: Argonne National Laboratory
Year: 1996
DOI identifier: 10.2172/226044
OAI identifier:
Provided by: UNT Digital Library
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