| Issue |
Europhys. Lett.
Volume 64, Number 4, November 2003
|
|
|---|---|---|
| Page(s) | 524 - 528 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00262-4 | |
| Published online | 01 November 2003 | |
Polarised neutron reflectometry for GMR sensors optimization
1
DSM/DRECAM/SPEC, CEA Saclay - 91191 Gif-sur-Yvette, France
2
Laboratoire Léon Brillouin CEA/CNRS,
CE Saclay - 91191 Gif-sur-Yvette, France
3
OnStream MST B.V. - Lodewijkstraat 1, 5652 AC Eindhoven,
The Netherlands
Corresponding author: mp@drecam.saclay.cea.fr
Received:
18
December
2002
Accepted:
23
June
2003
Neutron reflectometry with spin analysis has allowed us to
perform selective hysteresis loops of each magnetic layer in GMR
spin valves. The intensities now available on reflectometers and
the advances of modelling give the possibility to perform a very
precise analysis of the magnetic configuration even in complex
systems with five different magnetic layers. Results obtained on
GMR spin valves show a rather complex behaviour of the free layer
as a function of the magnetic field. The 
soft layer
exhibits a non-homogeneous rotation which cannot be observed in
transport measurements. This non-homogeneous rotation explains the
necessity of a rather thick soft layer to avoid 1/f magnetic noise
in GMR sensors.
PACS: 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.47.De – Giant magnetoresistance / 73.50.Td – Noise processes and phenomena
© EDP Sciences, 2003
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