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Development of new materials for magneto resistors with high values of magneto-resistance effects and large signal/noise ratio. Application to high sensitivity sensors.

Ziel



Giant magneto resistance effects have been recently discovered in heterogeneous CoCu alloys prepared by sputtering (atomic Co-concentration ranging from 0 to 40 %). These consist of small Co precipitates embedded in a Cu non-magnetic matrix and more recently the study of a series of various transiton metals based alloys prepared by either sputtering or melt-spinning.

The great advantage of granular alloys compared to magnetic multilayers is that they are much simpler to prepare. They do not require a very accurate control of the thickness of the various layers during the growth process. They can be deposited at room temperature. Moreover, the optimal magneto resistive properties are obtained in these alloys after annealing up to 400 degrees C. This property gives them a good stability and longevity. Therefore these granular alloys appear as very good candidates for magnetic field sensors in a range of fields 50Oe - 1kOe. Such sensors can find a broad range of applications in measurements of spinning velocity (automobile industry), measurements of current (power electricity, transformers), reading of audio-tapes or magnetic tickets. The high sensitivity of these sensors gives the possibility to use them in medicine, in particular in cardiology.

The objective of this project is to investigate the properties of these new alloys in order to build new sensors with this new type of material.

In the framework of the project the following work will be done: the theory of the extraordinary Hall effect and the influence of quantum effects in the ferromagnetic composites prepared in Grenoble will be developed. In particular, the understanding of the influence of the grain morphology on these properties will be investigated; new types of magnetic transition metals based alloys will be prepared by either sputtering or melt-spinning; Co/Cu, Co/Ni composites will be prepared in modulated and granulated forms and the dependence of their electron transport properties on the granular sizes and layers thickness will be investigated; part of the measurements on these samples will be performed in Moscow. In particular, magneto-optical, magnetic viscosity and transport properties; preparation of Co/Cu, Co/Ni composite in modulated and granulated forms, based on the Grenoble Group experience will be investigate. Investigation of the dependence of their electron transport properties on the granular sizes and film thickness; magneto optics measurements on samples prepared by the Grenoble and the Kiev Group in the wavelength range 0.8 - 1.6 microns; and organisation of a meeting in Berlin to discuss the scientific and technological implications of the use of granular magnetic alloys for the fabrication of new sensors will be undertaken. The Sussex Group will bring its experience of fundamental and applied research in the field of non-invasive sensors.

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Koordinator

Université de Liège
EU-Beitrag
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Adresse
Allée du 6 Août 17
4000 Liège
Belgien

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Beteiligte (6)