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Enhanced L10 chemical ordering and FePt/Fe3O4 core/shell structure formation in Zn-doped FePt nanoparticles

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4 Author(s)
Kim, Ki-Eun ; Department of Materials Science and Engineering, Korea University, Seoul 136-713, South Korea ; Lee, Myung-Ki ; Sung, Yun-Mo ; Kim, Tae Geun

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FePt nanoparticles doped with ∼12 at. % Zn were successfully synthesized using the polyol and thermolysis methods. Their chemical ordering to the face-centered tetragonal (L10) phase was found to occur at a remarkably reduced temperature of ∼324 °C. The nanoparticles annealed at 400 °C for 60 min were identified to be in a highly crystalline L10 phase, showing formation of the distinct FePt/Fe3O4 core/shell structure. Also, they demonstrated strong ferromagnetic characteristics due to the high crystallinity with the L10 phase and the exchange coupling between the FePt core and the Fe3O4 shell.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 17 )

Date of Publication:

Apr 2007

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