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/spl plusmn/0.6 /spl Aring/, 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-/spl Aring/ 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/spl plusmn/2 /spl Aring/ periodicity in this region.
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