Volume 63, Number 5, September 2003
|Page(s)||771 - 777|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Overdamped interlayer exchange coupling and disorder-dominated magnetoresistance in superlattices
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
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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