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Diffusion Enhancement in FePt Nanoparticles for L1\(_0\) Stability

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Nanoparticles from the Gasphase

Part of the book series: NanoScience and Technology ((NANO))

Abstract

FePt has a high magnetic anisotropy in the thermodynamically stable L1\(_0\) phase, so that nanoparticles of this material could remain ferromagnetic at small sizes and be used for magnetic storage. However, the stabilization of the L1\(_0\) phase is not straight forward at small particle sizes, and instead, twinned icosahedral structures are formed which are thought to be metastable. In order to enhance the formation of the L1\(_0\) phase, the lattice has to be agitated so that icosahedral structures will destabilize. In addition to thermal annealing‚ we introduce agitation methods related to oxygen reactive sputtering, nitriding-denitriding, and segregation in FePt nanoparticles prepared in the gas phase. We discuss principally the structural properties of the particles obtained prior to and after employing the various agitation techniques.

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Acknowledgments

We thank our collegues with whom we have worked over the years, B. Rellinghaus, S. Stappert, O. Dmitrieva, G.Ünlü, G. Dumpich, and J. Kästner, and who have carried out much of the works presented in this article. We gratefully acknowledge the Deutsche Forschungsgemeinschaft (SFB445) for financial support.

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Authors and Affiliations

  1. Faculty of Physics and CENIDE, University of Duisburg-Essen, LotharstraĂźe 1, 47057, Duisburg, Germany

    Mehmet Acet, M. Spasova & A. Elsukova

Authors
  1. Mehmet Acet
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  2. M. Spasova
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  3. A. Elsukova
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Corresponding author

Correspondence to Mehmet Acet .

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Editors and Affiliations

  1. , Department of Physics and CeNIDE, University of Duisburg-Essen, Lotharstr. 1, Duisburg, 47048, Germany

    Axel Lorke

  2. , Nanoparticle Process Technology, University of Duisburg-Essen, Lotharstr. 1, Duisburg, 47048, Germany

    Markus Winterer

  3. Institute for Nano Structures, and Technology (NST), University of Duisburg-Essen, Lotharstr. 1, Duisburg, 47048, Germany

    Roland Schmechel

  4. IVG, Institute for Combustion, and Gasdynamics, University of Duisburg-Essen, Lotharstr. 1, Duisburg, 47048, Germany

    Christof Schulz

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Acet, M., Spasova, M., Elsukova, A. (2012). Diffusion Enhancement in FePt Nanoparticles for L1\(_0\) Stability. In: Lorke, A., Winterer, M., Schmechel, R., Schulz, C. (eds) Nanoparticles from the Gasphase. NanoScience and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-28546-2_5

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