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Magnetic Nanoparticle Aggregation States in Ag100-xFex Cosputtered Granular Films Investigated by Magnetic and Magnetotransport Measurements

  • Paolo Allia (a1), Federica Celegato (a1), Marco Coisson (a2), Paola Tiberto (a2), Franco Vinai (a2) and Federico Spizzo (a3)...

Abstract

Magnetoresistance and.magnetization measurements have been performed on nanogranular, cosputtered Ag100-xFex films (x= 10 to 30) in the 4 K – 300 K temperature interval. The analysis reveals that the films with x ≤ 14 are interacting superparamagnets, characterized by a magnetic correlation length of the order of the electronic mean free path λ. Films with x ≥ 26 behave as concentrated magnets with strong competing interactions among magnetic moments (frustrated ferromagnets) and magnetic correlation length much larger than λ.

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Magnetic Nanoparticle Aggregation States in Ag100-xFex Cosputtered Granular Films Investigated by Magnetic and Magnetotransport Measurements

  • Paolo Allia (a1), Federica Celegato (a1), Marco Coisson (a2), Paola Tiberto (a2), Franco Vinai (a2) and Federico Spizzo (a3)...

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