Issue |
Europhys. Lett.
Volume 42, Number 3, May I 1998
|
|
---|---|---|
Page(s) | 331 - 338 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1998-00251-7 | |
Published online | 01 September 2002 |
Exchange coupling and magnetoresistance in Co/Ir multilayers prepared by ion beam sputtering
1
IPCMS-GEMM, ULP-CNRS, UMR 046,
23 rue du Loess 67037 Strasbourg, France
2
SIEMENS AG, D-91052 Erlangen, Germany
Received:
25
August
1997
Accepted:
16
March
1998
A series of Co/Ir multilayers has been prepared by Ion Beam Sputtering on
a glass substrate covered by a Fe(10 nm)/Ir(10 nm) buffer layer. The Co thickness
has been fixed at 3 nm and the Ir thickness varied between 0.1 and 2.4 nm.
X-ray diffraction patterns performed on these multilayers show an fcc structure
with a (111) preferential texture. The antiferromagnetic (AFM) exchange coupling
and magnetoresistance show an oscillating behavior as a function of the Ir
thickness with a period of about 1 nm. The first AFM peak has been observed
at the 0.6 nm thick Ir spacer layer and its strength corresponds to at 4.2 K. This interlayer coupling is strong and is
supported by ab initio calculations of the magnetization. Very strong
variation of the exchange coupling has been observed between room temperature
and 4.2 K and is attributed to the strong intermixing at the Co/Ir interfaces.
PACS: 75.30.Et – Exchange and superexchange interactions / 75.70.Cn – Interfacial magnetic properties (multilayers, magnetic quantum wells, superlattices, magnetic heterostructures)
© EDP Sciences, 1998
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