INVESTIGADORES
FABRICIUS Gabriel
artículos
Título:
Electronic and magnetic properties of Fe-Cu superlattices
Autor/es:
G. FABRICIUS; A.M. LLOIS; M. WEISSMANN
Revista:
JOURNAL OF PHYSICS CONDENSED MATTER
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 1994 vol. 6 p. 5017 - 5024
ISSN:
0953-8984
Resumen:
The electronic and magnetic properties of Fe/Cu superlattices grown in
the (111) direction, for which Fe takes the FCC structure, are studied
with a parametrized tight-binding Hamiltonian. The splitting between
majority and minority d bands is related to an effective exchange
parameter J that we adjust to obtain within our model the bulk
magnetization for BCC Fe. As the magnetization of bulk FCC Fe is very
sensitive to this parameter we study the magnetic properties as a
function of it. We find that the 2Fe/2Cu superlattice is possibly
ferromagnetic and that 3Fe/3Cu has more than one stable state
(paramagnetic, ferromagnetic or ferrimagnetic) with quite similar
energies. As recent experimental results detect a small magnetic moment
for this last superlattice, comparison with the calculations suggest
that they are ferrimagnetic. Comparison with calculations for 2Fe and
3Fe FCC(111) free-standing slabs show that the 2Fe/2Cu and 3Fe/3Cu
superlattices behave as low-dimensional systems, the effect of Cu being
to slightly reduce the magnetic moment per atom of Fe with respect to a
free-standing slab.