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Journal Articles Journal of Nanoparticle Research Year : 2013

Giant Magnetoresistance in cluster-assembled nanostructures: on the influence of inter-particule interactions

Abstract

The giant magnetoresistance response of granular systems has since its discovery been described by a simple model based on the geometric orientation of the magnetic moments of adjacent nanoparticles. This model has been proven quite successful in many cases but its being based on decoupled neighboring grains has never been verified as all available studies rely on samples with too high concentration. Here we report on magnetic and magnetotransport measurements of cluster-assembled nanostructures with cobalt clusters around 2.3 nm diameter embedded in copper matrices at different concentrations. The thorough magnetic characterization based on the recently developed “triple fit” method allows the detection of measurable inter-particle interactions and thus assures true superparamagnetic behavior in the most dilute sample. The spintronic response is compared to theory and we show that only at low concentration (0.5 at.% Co) all experiments are consistent and the common theoretical description is appropriate. Increasing the concentration to 2.5 and 5 at.% implies deviations between magnetometry and magnetotransport.

Dates and versions

hal-02505800 , version 1 (11-03-2020)

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Simón Oyarzun, Artur Domingues Tavares de Sa, Juliette Tuaillon-Combes, Alexandre Tamion, Arnaud Hillion, et al.. Giant Magnetoresistance in cluster-assembled nanostructures: on the influence of inter-particule interactions. Journal of Nanoparticle Research, 2013, 15, pp.1968. ⟨10.1007/s11051-013-1968-8⟩. ⟨hal-02505800⟩
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