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Journal of Applied Physics / Volume 101 / Issue 11 / MAGNETISM AND SUPERCONDUCTIVITY

J. Appl. Phys. 101, 113914 (2007); http://dx.doi.org/10.1063/1.2737389 (8 pages)

Core-shell nanocrystalline structures in oxidized iron thin films prepared by sputtering at very low temperatures

F. Jiménez-Villacorta1, Y. Huttel1, A. Muñoz-Martín2, C. Ballesteros3, E. Román1, and C. Prieto1

1Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
2Centro de Microanálisis de Materiales, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
3Departamento de Física, Escuela Politécnica Superior, Universidad Carlos III de Madrid, Avenida Universidad 30, 28911 Leganés, Spain

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(Received 16 February 2007; accepted 31 March 2007; published online 12 June 2007)

We report on the effect of preparation temperature in the magnetic properties of oxidized iron thin films deposited by dc-magnetron sputtering below room temperature. Films prepared at 300 K show a typical thin film magnetic behavior, whereas samples prepared at 200 K present visible features of granular core-shell system formed by an oxide shell surrounding a ferromagnetic core and displaying exchange anisotropy. These differences are directly linked to the film microstructure and composition. We present results of microstructure, composition, and chemical analysis in order to discuss the observed magnetic behavior. Size and shape of iron crystallographic grains were characterized by transmission electron microscopy. Depth-resolved compositional characterization, obtained by ion-beam analysis techniques, has probed the penetration of oxygen along the thickness of the films and x-ray photoelectron spectroscopy was used to identify the different iron oxide species present in the structures.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
  3. RESULTS AND DISCUSSION
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

nanostructured materials, iron, ferromagnetic materials, magnetic thin films, sputtered coatings, grain size, transmission electron microscopy, X-ray photoelectron spectra

PACS

  • 75.70.Ak

    Magnetic properties of monolayers and thin films

  • 75.50.Tt

    Fine-particle systems; nanocrystalline materials

  • 75.50.Bb

    Fe and its alloys

  • 61.46.Hk

    Nanocrystals

  • 68.55.-a

    Thin film structure and morphology

  • 79.60.Dp

    Adsorbed layers and thin films

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2737389

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    F. Jiménez-Villacorta, A. Muñoz-Martin, and C. Prieto, J. Appl. Phys. 96, 6224 (2004)JAPIAU000096000011006224000001.

    J. Stankiewicz, F. Jiménez-Villacorta, and C. Prieto, Phys. Rev. B 73, 014429 (2006).

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