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Magnetic properties of Fe and Ni nanoparticles formed in triethoxysilane films by ion irradiation or thermal processing

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Abstract

Ion irradiation or heat treatments in vacuum of gel films prepared from mixtures of triethoxysilane with Fe and Ni nitrates permits to obtain a precipitation of metal particles in a glassy matrix, because these gels contain hydrido groups able to reduce Fe3 + and Ni2 + ions. The precipitation under irradiation is ascribed to the electronic excitations produced by the ions and the volume of metallic phase increases in proportion to the amount of energy transferred to electrons. The metal particles exhibit a narrower range of sizes than in films submitted to heat treatments in vacuum. Experiments of electron spin resonance indicate that the magnetic behavior of irradiated films is affected by a stress-induced anisotropy field. Films containing 3 to 7 at% Fe are in a superparamagnetic state in a given range of temperatures while the magnetic moments of nickel particles in films with similar metal contents exhibit a stronger correlation, due to a larger yield of precipitation and to the stress.

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Authors and Affiliations

  1. CSNSM-IN2P3, bâtiment 108, 91405, Orsay Campus, France

    J. C. Pivin

  2. CEA Saclay, SPEC-DRECAM, 91191, Gif-sur-Yvette, France

    E. Vincent

  3. CEA Saclay, LSI-DRECAM, 91191, Gif-sur-Yvette, France

    S. Esnouf

  4. Centre de Recherche et de Restauration des Musées de France, 6 rue des Pyramides, 75041, Paris Cedex 01, France

    M. Dubus

Authors
  1. J. C. Pivin
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  2. E. Vincent
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  3. S. Esnouf
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  4. M. Dubus
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Correspondence to J. C. Pivin.

Additional information

Received: 4 December 2003, Published online: 2 April 2004

PACS:

61.82.-d Radiation effects on specific materials - 75.70.-i Magnetic properties of thin films, surfaces, and interfaces - 76.50. + g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance - 75.50.Tt Fine-particle systems; nanocrystalline materials

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Pivin, J.C., Vincent, E., Esnouf, S. et al. Magnetic properties of Fe and Ni nanoparticles formed in triethoxysilane films by ion irradiation or thermal processing. Eur. Phys. J. B 37, 329–337 (2004). https://doi.org/10.1140/epjb/e2004-00063-7

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  • DOI: https://doi.org/10.1140/epjb/e2004-00063-7

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