Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 8, Pages 2176-2180Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201309723
Keywords
exchange interactions; intermetallic phases; magnetic properties; nanostructures; reduction
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Funding
- National Basic Research Program of China [2010CB934601]
- NSFC [51125001, 51172005, 90922033]
- Natural Science Foundation of Beijing [2122022]
- Yok Ying Tung Found [122043]
- Doctoral Program [20120001110078]
- New Century Talent of the Education Ministry of China [NCET-09-0177]
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Controlling exchange coupling between hard magnetic and soft magnetic phases is the key to the fabrication of advanced magnets with tunable magnetism and high energy density. Using FePt as an example, control over the magnetism in exchange-coupled nanocomposites of hard magnetic face-centered tetragonal (fct) FePt and soft magnetic Co (or Ni, Fe2C) is shown. The dispersible hard magnetic fct-FePt nanoparticles are first prepared with their coercivity (H-c) reaching 33kOe. Then core/shell fct-FePt/Co (or Ni, Fe2C) nanoparticles are synthesized by reductive thermal decomposition of the proper metal precursors in the presence of fct-FePt nanoparticles. These core/shell nanoparticles are strongly coupled by exchange interactions and their magnetic properties can be rationally tuned by the shell thickness of the soft phase. This work provides an ideal model system for the study of exchange coupling at the nanoscale, which will be essential for building superstrong magnets for various permanent magnet applications in the future.
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