Bulk FePt Fe3 Pt nanocomposite magnets prepared by spark plasma sintering

Chuan Bing Rong; Vikas Nandwana; Narayan Poudyal; J. Ping Liu; Tetsuji Saito; Yaqiao Wu; Matthew J. Kramer

doi:10.1063/1.2710811

Bulk FePt Fe3 Pt nanocomposite magnets prepared by spark plasma sintering

Chuan Bing Rong, Vikas Nandwana, Narayan Poudyal, J. Ping Liu, Tetsuji Saito, Yaqiao Wu, Matthew J. Kramer

Research and Economic Development

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Abstract

FePt Fe3 Pt bulk nanocomposite magnets have been prepared by the spark plasma sintering of chemically synthesized FePt and Fe3 O4 nanoparticles under 100 MPa at 400-600 °C. It was found that the phase transition of the FePt compound from the face centered cubic to the L 10 started at 500 °C and was almost completed at 600 °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 °C. Pressure rather than temperature was more effective in enhancing intergrain exchange coupling compared to temperature.

Original language	English
Article number	09K515
Journal	Journal of Applied Physics
Volume	101
Issue number	9
DOIs	https://doi.org/10.1063/1.2710811
State	Published - 2007

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title = "Bulk FePt Fe3 Pt nanocomposite magnets prepared by spark plasma sintering",

abstract = "FePt Fe3 Pt bulk nanocomposite magnets have been prepared by the spark plasma sintering of chemically synthesized FePt and Fe3 O4 nanoparticles under 100 MPa at 400-600 °C. It was found that the phase transition of the FePt compound from the face centered cubic to the L 10 started at 500 °C and was almost completed at 600 °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 °C. Pressure rather than temperature was more effective in enhancing intergrain exchange coupling compared to temperature.",

author = "Rong, {Chuan Bing} and Vikas Nandwana and Narayan Poudyal and Liu, {J. Ping} and Tetsuji Saito and Yaqiao Wu and Kramer, {Matthew J.}",

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T1 - Bulk FePt Fe3 Pt nanocomposite magnets prepared by spark plasma sintering

AU - Rong, Chuan Bing

AU - Nandwana, Vikas

AU - Poudyal, Narayan

AU - Liu, J. Ping

AU - Saito, Tetsuji

AU - Wu, Yaqiao

AU - Kramer, Matthew J.

PY - 2007

Y1 - 2007

N2 - FePt Fe3 Pt bulk nanocomposite magnets have been prepared by the spark plasma sintering of chemically synthesized FePt and Fe3 O4 nanoparticles under 100 MPa at 400-600 °C. It was found that the phase transition of the FePt compound from the face centered cubic to the L 10 started at 500 °C and was almost completed at 600 °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 °C. Pressure rather than temperature was more effective in enhancing intergrain exchange coupling compared to temperature.

AB - FePt Fe3 Pt bulk nanocomposite magnets have been prepared by the spark plasma sintering of chemically synthesized FePt and Fe3 O4 nanoparticles under 100 MPa at 400-600 °C. It was found that the phase transition of the FePt compound from the face centered cubic to the L 10 started at 500 °C and was almost completed at 600 °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 °C. Pressure rather than temperature was more effective in enhancing intergrain exchange coupling compared to temperature.

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DO - 10.1063/1.2710811

M3 - Article

AN - SCOPUS:34248549505

SN - 0021-8979

VL - 101

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 9

M1 - 09K515

ER -

Bulk FePt Fe3 Pt nanocomposite magnets prepared by spark plasma sintering

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