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Journal of Materials Science

, Volume 54, Issue 11, pp 8276–8288 | Cite as

Nanoscale integration of oxides and metals in bulk 3D composites: leveraging SrFe12O19/Co interfaces for magnetic exchange coupling

  • A. D. Volodchenkov
  • Y. KoderaEmail author
  • J. E. GarayEmail author
Composites
  • 112 Downloads

Abstract

The integration of different material classes (e.g, oxides and metals) with nanoscale dimensions in large 3D materials remains a fundamental challenge in nanocomposite fabrication. The incentive is that some of the most interesting properties occur at nanoscale interfaces, while the challenge arises from the difficulty in densifying the materials without deleterious reaction at the interface. Here, we introduce a method based on the synthesis of core–shell powders followed by efficient, relatively low-temperature densification with current-activated pressure-assisted densification. The composition of the bulk nanocomposites can be controlled by varying the core–shell weight ratio, leading to controllable thicknesses of the hard/soft magnetic phases. We demonstrate intimate mixtures of nanoscale strontium ferrite (hard magnetic phase) and Co–Fe (soft magnetic phase) with minimal reaction. The high volume content of high-quality oxide/metal interfaces leads to magnetic exchange coupling in the composites.

Notes

Acknowledgements

The support of this work from the Office of Naval Research with Dr H. S. Coombe as program manager is most gratefully acknowledged.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Advanced Materials Processing and Synthesis (AMPS) Laboratory, University of CaliforniaSan DiegoUSA
  2. 2.Materials Science and Engineering Program, Mechanical and Aerospace Engineering DepartmentUniversity of CaliforniaSan DiegoUSA

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