Volume 64, Number 4, November 2003
|Page(s)||524 - 528|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Polarised neutron reflectometry for GMR sensors optimization
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: email@example.com
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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