Bulk FePt/Fe{sub 3}Pt nanocomposite magnets prepared by spark plasma sintering

Journal Article · Tue May 01 00:00:00 EDT 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2710811· OSTI ID:20982866

Rong, Chuan-Bing; Nandwana, Vikas; Poudyal, Narayan; Liu, J Ping; Saito, Tetsuji; Wu, Yaqiao; Kramer, Matthew J ^[1]

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1. Department of Physics, University of Texas at Arlington, Arlington, Texas 76019 (United States)

FePt/Fe{sub 3}Pt bulk nanocomposite magnets have been prepared by the spark plasma sintering of chemically synthesized FePt and Fe{sub 3}O{sub 4} nanoparticles under 100 MPa at 400-600 degree sign C. It was found that the phase transition of the FePt compound from the face centered cubic to the L1{sub 0} started at 500 degree sign C and was almost completed at 600 degree sign C during the sintering. The activated atomic diffusion during the phase transition led to a significant increase in density. The density about 70% of the theoretical value has been obtained. Grain size of the sintered samples remains nanoscale even after a postannealing at 700 degree sign C. Pressure rather than temperature was more effective in enhancing intergrain exchange coupling compared to temperature.

• OSTI ID: 20982866
• Journal Information: Journal of Applied Physics, Vol. 101, Issue 9; Conference: 10. joint MMM/INTERMAG conference, Baltimore, MD (United States), 7-11 Jan 2007; Other Information: DOI: 10.1063/1.2710811; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BINARY ALLOY SYSTEMS
COMPOSITE MATERIALS
EXCHANGE INTERACTIONS
FCC LATTICES
FERROMAGNETIC MATERIALS
GRAIN SIZE
IRON ALLOYS
IRON OXIDES
MAGNETS
NANOSTRUCTURES
PHASE TRANSFORMATIONS
PLATINUM ALLOYS
PRESSURE DEPENDENCE
PRESSURE RANGE MEGA PA 10-100
SINTERING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K