Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 3, Issue 27, Pages 7075-7080Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc01145k
Keywords
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Funding
- National Natural Science Foundation of China [51101069, 21305025]
- Heilongjiang Postdoctoral Science Starting Foundation [AUGA4120024815]
- HIT Young Talent Program [AUGA5710012715, AUGA5710005513]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE), under its Vehicle Technologies Program, through the Ames Laboratory
- Iowa State University [DE-AC02-07CH11358]
- US Department of Energy [DE-FG02-04ER46152]
- US Army Research Office [W911NF-10-2-0099]
- NSF [NSF-DMR-0960110]
- Nebraska Research Facilities
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We report a novel approach for the fabrication of exchange-coupling L1(0)-FePt-bcc-Fe nanocomposites with a gradient interface between hard and soft phases from FePt nanoparticles (NPs) and FePt-Fe3O4 dumbbell shaped NPs, which are prepared by a facile one-pot synthesis method. High temperature annealing in argon is first used to convert FePt in FePt-Fe3O4 dumbbell shaped NPs to the L1(0)-FePt phase. Then Fe3O4 in FePt-Fe3O4 dumbbell shaped NPs is reduced to bcc-Fe by low temperature annealing in reducing gas, forming L1(0)-FePt-Fe nanocomposites. The L1(0)-FePt-Fe nanocomposites exhibit both large coercivity and high magnetic moment. The work demonstrates that creating a nanoscale gradient interface between magnetically hard and soft phases is a promising approach for the fabrication of high performance permanent magnets.
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