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Multiphase Resistivity Model for Magnetic Nanocomposites Developed for High Frequency, High Power Transformation

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Abstract

New power conversion systems that offer promise to transform electricity grids into unified interactive supply networks require high-resistivity soft-magnetic materials to allow for switching of magnetic materials at frequencies approaching 100 kHz for power transformation in the megawatt range. Amorphous and nanocomposite soft-magnetic materials, which represent the state of the art in terms of high power densities and low losses at high frequencies, have resistivities that depend on the structures and spatial distributions of multiple phases in thin ribbons. We present a multiphase resistivity model applicable to nanocomposite materials by considering an equivalent circuit approach considering paths through an amorphous, crystalline, and growth inhibitor shell phase. We detail: (a) identification of amorphous, crystalline, and shell phases; (b) consideration of the role of the morphology of each phase in an equivalent circuit model for the resistance; (c) a two-band model for the Fe/Co composition dependence of the resistivity in crystalline and amorphous phases; (d) a virtual bound state model for resistivity to explain increased resistivity due to early transition-metal growth inhibitors in the shell surrounding the nanocrystalline phase; and (e) disorder effects on amorphous phase resistivity. Experimental design and results for systems of interest in high-frequency power transformation are discussed in the context of our model including: (a) techniques for measurements of cross-section and density, (b) four-point probe and surface resistivity measurements, and (c) measurements in Fe- and Co-rich systems comparing amorphous and nanocomposite materials.

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Authors and Affiliations

  1. Carnegie Mellon University, Pittsburgh, PA, USA

    V. DeGeorge, S. Shen, P. Ohodnicki & M. E. McHenry

  2. National Energy Technology Laboratory, Morgantown, WV, USA

    P. Ohodnicki & M. Andio

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  1. V. DeGeorge
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  2. S. Shen
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  3. P. Ohodnicki
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  4. M. Andio
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  5. M. E. McHenry
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Correspondence to V. DeGeorge.

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DeGeorge, V., Shen, S., Ohodnicki, P. et al. Multiphase Resistivity Model for Magnetic Nanocomposites Developed for High Frequency, High Power Transformation. J. Electron. Mater. 43, 96–108 (2014). https://doi.org/10.1007/s11664-013-2835-1

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