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Consolidation of cobalt nanorods: A new route for rare-earth free nanostructured permanent magnets

Ener, Semih and Anagnostopoulou, Evangelia and Dirba, Imants and Lacroix, Lise-Marie and Ott, Frédéric and Blon, Thomas and Piquemal, Jean-Yves and Skokov, Konstantin P. and Gutfleisch, Oliver and Viau, Guillaume (2018):
Consolidation of cobalt nanorods: A new route for rare-earth free nanostructured permanent magnets.
In: Acta Materialia, Pergamon-Elsevier Science LTD, Oxford, England, pp. 290-297, 145, ISSN 13596454, DOI: 10.1016/j.actamat.2017.12.009, [Online-Edition: https://doi.org/10.1016/j.actamat.2017.12.009],
[Article]

Abstract

Rare-earth free permanent magnets were produced by consolidation of cobalt nanorods synthesized by the polyol process exhibiting a mean diameter in the range 10-30 nm. Compactions of magnetically prealigned rod assemblies at various pressures and temperatures were carried out to make dense materials. Bulk magnets exhibiting a very good mechanical strength and an energy product as high as 65 kJ m(-3) were obtained. The best results were obtained when the compaction conditions were soft enough to preserve the morphology and alignment of the rods in the final material, as revealed by X-ray diffraction and neutron scattering. For the first time the bottom-up approach is convincingly reported to produce bulk magnets without the addition of any matrix, the obtained nanostructured materials exhibit coercivity much higher than the AlNiCo magnets and can fill the performance "gap" between hexaferrites and rare-earth based magnets. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type: Article
Erschienen: 2018
Creators: Ener, Semih and Anagnostopoulou, Evangelia and Dirba, Imants and Lacroix, Lise-Marie and Ott, Frédéric and Blon, Thomas and Piquemal, Jean-Yves and Skokov, Konstantin P. and Gutfleisch, Oliver and Viau, Guillaume
Title: Consolidation of cobalt nanorods: A new route for rare-earth free nanostructured permanent magnets
Language: English
Abstract:

Rare-earth free permanent magnets were produced by consolidation of cobalt nanorods synthesized by the polyol process exhibiting a mean diameter in the range 10-30 nm. Compactions of magnetically prealigned rod assemblies at various pressures and temperatures were carried out to make dense materials. Bulk magnets exhibiting a very good mechanical strength and an energy product as high as 65 kJ m(-3) were obtained. The best results were obtained when the compaction conditions were soft enough to preserve the morphology and alignment of the rods in the final material, as revealed by X-ray diffraction and neutron scattering. For the first time the bottom-up approach is convincingly reported to produce bulk magnets without the addition of any matrix, the obtained nanostructured materials exhibit coercivity much higher than the AlNiCo magnets and can fill the performance "gap" between hexaferrites and rare-earth based magnets. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Journal or Publication Title: Acta Materialia
Volume: 145
Publisher: Pergamon-Elsevier Science LTD, Oxford, England
Uncontrolled Keywords: Cobalt nanorods, Permanent magnets, Bottom-up, Energy product, Consolidation process
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences
Date Deposited: 12 Mar 2018 10:15
DOI: 10.1016/j.actamat.2017.12.009
Official URL: https://doi.org/10.1016/j.actamat.2017.12.009
Funders: Authors are grateful to the European Community's Seventh Framework Programme for supporting this study with FP7/2007-2013 under Grant agreement number EU NMP3-SL-2012-280670 (Rare Earth Free Permanent Magnets - REFREEPERMAG).
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