Bulk granular Cu90Co10 alloys displaying a negative giant magnetoresistance (GMR) have been produced by submitting melt-spun ribbons to conventional annealing and to de Joule-Heating in vacuo to induce the precipitation of Go-cluster with size in the nanometer range. Room-temperature GMR values up to 7% al 20 kOe are observed in samples submitted to suitable de Joule-heating treatments. Shorthand information on the distribution of particle radii is obtained by analysing the room-temperature anhysteretic magnetisation curves. The magnetoresistance has been evaluated on as-prepared and annealed thin films of the same starting composition obtained by sputtering. The measured effect is always lower in sputtered films than in melt-spun ribbons. The effect of the substrate temperature during the film deposition on the GMR is studied.
|Titolo:||Room-temperature giant magnetoresistance of melt-spun ribbons and thin films of granular Cu100-x Cox|
|Data di pubblicazione:||1995|
|Digital Object Identifier (DOI):||10.4028/www.scientific.net/MSF.195.203|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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