CobaltMaghrebV1, France, Analysis, bibRecord, 000286

Comparative study between the effect of annealing and substrate temperature on the magnetic and transport properties of Co20Cu80 granular alloys

Identifieur interne : 000286 ( France/Analysis ); précédent : 000285; suivant : 000287

Comparative study between the effect of annealing and substrate temperature on the magnetic and transport properties of Co20Cu80 granular alloys

Auteurs : H. Errahmani [Maroc] ; A. Berrada [Maroc] ; G. Schmerber [France] ; A. Dinia [France]

Source :

Materials letters : (General ed.) [ 0167-577X ] ; 2001.

RBID : Pascal:02-0007221

Descripteurs français

Pascal (Inist)
- Aimantation, Magnétorésistance, Magnétorésistance géante, Ferromagnétisme, Superparamagnétisme, Coexistence, Recuit, Substrat, Effet température, Séparation phase, Orientation grain, Microstructure, Diffraction RX, Couche mince, Relation fabrication propriété, Structure granulaire, Alliage base cuivre, Cobalt alliage, Alliage binaire, Etude expérimentale, Alliage CuCo, Co Cu, 7570P.

English descriptors

KwdEn :
- Annealing, Binary alloys, Cobalt alloys, Coexistence, Copper base alloys, Experimental study, Fabrication property relation, Ferromagnetism, Giant magnetoresistance, Grain orientation, Granular structure, Magnetization, Magnetoresistance, Microstructure, Phase separation, Substrates, Superparamagnetism, Temperature effects, Thin films, XRD.

Abstract

We have studied the effect of substrate temperature on the magnetic and the transport properties and compared it to the results of annealing in Co₂₀Cu₈₀ granular alloy. The samples were prepared by ion-beam sputtering technique (IBS). At room temperature, the optimal value of the giant magnetoresistance (GMR) is observed in Co₂₀Cu₈₀ alloy after annealing at 250°C. However, the substrate temperature was found to have an opposite effect when compared to the results of the annealing. Indeed, as the substrate temperature increases the GMR decreases down to about 0.3%. Moreover, the saturation field is decreasing to reach approximately 2 kOe for 350°C substrate temperature. Such a reduction of the saturation field is not generally observed in the Co-Cu granular alloys prepared by other techniques. This is attributed to the fact that the CoCu alloys deposited at high substrate temperature have an appreciable mobility of their particles and favoured a quasi complete segregation with large grains size.

Affiliations:

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Le document en format XML

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<term>Magnétorésistance géante</term>
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<term>Superparamagnétisme</term>
<term>Coexistence</term>
<term>Recuit</term>
<term>Substrat</term>
<term>Effet température</term>
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<front><div type="abstract" xml:lang="en">We have studied the effect of substrate temperature on the magnetic and the transport properties and compared it to the results of annealing in Co<sub>20</sub>
Cu<sub>80</sub>
 granular alloy. The samples were prepared by ion-beam sputtering technique (IBS). At room temperature, the optimal value of the giant magnetoresistance (GMR) is observed in Co<sub>20</sub>
Cu<sub>80</sub>
 alloy after annealing at 250°C. However, the substrate temperature was found to have an opposite effect when compared to the results of the annealing. Indeed, as the substrate temperature increases the GMR decreases down to about 0.3%. Moreover, the saturation field is decreasing to reach approximately 2 kOe for 350°C substrate temperature. Such a reduction of the saturation field is not generally observed in the Co-Cu granular alloys prepared by other techniques. This is attributed to the fact that the CoCu alloys deposited at high substrate temperature have an appreciable mobility of their particles and favoured a quasi complete segregation with large grains size.</div>
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Comparative study between the effect of annealing and substrate temperature on the magnetic and transport properties of Co20Cu80 granular alloys

Comparative study between the effect of annealing and substrate temperature on the magnetic and transport properties of Co20Cu80 granular alloys

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

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