Magneto-transport in granular ribbons at high magnetic fields

We have measured the bulk and surface magnetisation and magnetoresistance o f granular Co10Cu90 ribbons treated with isochronous anneals, from helium t o room temperature and at high magnetic fields. The magnetoresistance of th ese materials can be larger than 15% at room temperature and at high magnet ic fields. We show that interparticle interactions are needed for a complet e description of the experimental results. (C) 1999 Elsevier Science B.V. A ll rights reserved.