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Magnetic Properties of the Iron–Nickel System: Pressure, Composition, and Grain Size

  • Chapter
Magnetic Fields in the Solar System

Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 448))

Abstract

We present an introduction to FeNi alloys as they appear in nature and how their magnetic properties can be studied in the laboratory. Meteorites provide natural samples which can carry information about our early Solar System and the magnetic fields present at that time. Grain size, and therefore domain state, of magnetic particles is the key to understanding their ability to record magnetic information on geological time scales. Material specific properties can be easier studied and optimized for technological applications from synthetic samples. We present common synthesis methods as well as analytical procedures to analyze the composition, crystal structure, grain size, and magnetic properties of FeNi alloys. We present data compiled from the literature together with our own results from samples synthesized by mechanical alloying and melting. In particular, we demonstrate changes in hysteresis and backfield parameters as well as Curie temperatures linked to composition, pressure, and alloying. The single-domain (SD) threshold in FeNi alloys remains unknown due to methodical limits in grain size and strong magnetic interactions between individual particles.

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Notes

  1. 1.

    For a more in depth discussion of the structures and a full phase diagram see Swartzendruber et al. (1991).

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Acknowledgements

Funding was provided through the Deutsche Forschungsgemeinschaft (DFG) projects WA 3402/1-1 and GI712/7-1. We thank Martin Leberer and Johannes Heinbuch for assistance in the laboratory and Bernd Maier for supplying X-ray data. FRITSCH GmbH provided technical support for the ball mill. A review by Jérôme Gattacceca helped to improve the manuscript.

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  1. Department of Earth and Environmental Sciences, LMU Munich, Theresienstr. 41, 80333, Munich, Germany

    Michael Wack, Michael Volk & Qingguo Wei

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  1. Michael Wack
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  2. Michael Volk
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Correspondence to Michael Wack .

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Editors and Affiliations

  1. Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany

    Hermann Lühr

  2. Max Planck Institute for Solar System Research, Göttingen, Germany

    Johannes Wicht

  3. Department of Earth and Environmental Sciences, Ludwig Maximilians Universität, München, Germany

    Stuart A. Gilder

  4. Institut für Mathematik, Universität Potsdam, Potsdam, Germany

    Matthias Holschneider

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Wack, M., Volk, M., Wei, Q. (2018). Magnetic Properties of the Iron–Nickel System: Pressure, Composition, and Grain Size. In: Lühr, H., Wicht, J., Gilder, S.A., Holschneider, M. (eds) Magnetic Fields in the Solar System. Astrophysics and Space Science Library, vol 448. Springer, Cham. https://doi.org/10.1007/978-3-319-64292-5_14

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