Verlag des Forschungszentrums Jülich
JUEL-3041
Kläsges, Ralph
Spin- und Angle-resolved photoemissions from magnetic quantum well states in Cu on Co(1007)
89 S., 1995
Abstract
The electronic structure of thin epitaxial Cu films on Co(lOO) has been studied by
spin- and angle-resolved photoemission. Due to the quantization of bulk bands in
a layer structure discrete states of sp symmetry are observed in the Cu overlayer,
which are described in the framework of quantum well (QW) states. QW states in
Cu on Co(lOO) are found to be spin-polarized up to Cu film thicknesses of more than
20 atomic layers. They are predominantly of minority spin with a weak exchange
split majority spin feature. The experimental results agree well with an ab initio
calculation of QW states in Cu on Co(lOO). Spin-polarized QW states can be
explained in terms of spin-dependent partial reflections at the Co/Cu interface,
leading to a different degree of confinement of majority and minority spin states in
the overlayer. This description accounts also for the long-range indirect coupling
between ferromagnetic layers separated by a Cu(lOO) spacer and thus provides a
common basis on which both spin-polarized QW states and oscillatory magnetic
coupling can be understood.
Neuerscheinungen
Schriften des Forschungszentrums Jülich
Ihre Ansprechperson
Heike Lexis
+49 2461 61-5367
zb-publikation@fz-juelich.de