Objective
The study of the Permalloy based multilayer structures lead to numerous results of great scientific and practical interests : understating of the interplay between exchange coupling and the coercivity contrast, influence of the various layer thicknesses on the magnetoresistance. Moreover, it was found possible to achieve 3.2 \% of DeltaR/R at room temperature, within 10 Oe, and without appreciable hysteresis, in optimized structures. These figures compare well with what obtained in the meantime with spin-valve structures, which is the other kind of GMR structure currently considered for read-out head applications.
It was found possible to define a new multitrack thin film mr head architecture, and an associated technological process to physically realize such components. This architecture exhibit an high degree of innovation: large number of tracks, potentiality for small track width, simplified interconnection. The resulting component is a 64 track thin film mr head, with 80 um track width. It allows to read out down to 0.5 um of bit length, with a total data rate of 2.56 Mbits/s at 2 cm/s of tape speed.
In conclusion, the obtained results allow to plan for the next three years the realization of high data rate/high capacity tape drive demonstrators which could have an important impact in application fields such as computer data storage peripherals or multimedia.
New magneto-resistive materials, with an effect at least five times larger than the conventional Permalloy, will be developed in order to make highly efficient magnetic sensors.
These materials - and the associated magnetic structure - will be used in a new multiplexed magnetic read-out head organisation. Such a component fixed in front of a low speed running tape, and integrating a large number of parallel tracks -, in association with a similar writing head previously developed at THOMSON-CSF/LCR, will constitute a real break-through towards the production of a new fully digital recording system.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology materials engineering coating and films
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering sensors
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Coordinator
92800 Puteaux
France
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