Issue |
Europhys. Lett.
Volume 63, Number 5, September 2003
|
|
---|---|---|
Page(s) | 771 - 777 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00580-y | |
Published online | 01 November 2003 |
Overdamped interlayer exchange coupling and
disorder-dominated magnetoresistance in
superlattices
1
Department of Physics, Indian Institute of Technology - Kanpur, 208016, India
2
Laboratoire de Physique du Solide, Ecole Supérieure de Physique, Chimie Industrielles de la Ville de Paris, CNRS UPR 5 - 75231 Paris, Cedex 5, France
Received:
14
January
2003
Accepted:
20
June
2003
Magnetization and magnetoresistance (MR) measurements are
reported on superlattices consisting of alternate layers of 20
unit cell (u.c.) thick (
)
and n u.c.
(
), where n varies from
1 to 10. The saturation field (
) and remnant
magnetization (
) show antiferromagnetic (AF)
interlayer coupling for
followed by an overdamped
oscillatory behavior with a period of
with
the increasing n. The low-temperature MR of the AF-coupled
superlattices is characterized by a steep increase up to a
critical field
(
) followed
by a
(
) dependence, whereas in the
ferromagnetically coupled samples the MR rises monotonically as
with no
. We attribute the
overdamped oscillations in
and
, and the
dual nature of MR to disorder modified quantum interference in the
spacer layers.
PACS: 75.70.Cn – Magnetic properties of interfaces (multilayers, superlattices, heterostructures) / 75.47.Gk – Colossal magnetoresistance / 75.47.Lx – Manganites
© EDP Sciences, 2003
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