Conversion of Anisotropically Phase-Segregated Pd/-Fe2O3 Nanoparticles into Exchange-Coupled fct-FePd/-Fe Nanocomposite Magnets

J. Am. Chem. Soc., 130 (13), 4210 -4211, 2008. 10.1021/ja077921v S0002-7863(07)07921-8
Web Release Date: March 12, 2008

Conversion of Anisotropically Phase-Segregated Pd/-Fe₂O₃ Nanoparticles into Exchange-Coupled fct-FePd/-Fe Nanocomposite Magnets

Toshiharu Teranishi,* Ayako Wachi, Masayuki Kanehara, Tetsuya Shoji, Noritsugu Sakuma, and Masafumi Nakaya

Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai, Tsukuba, Ibaraki 305-8571, Japan, and Higashifuji Technical Center, Toyota Motor Corporation, 1200 Mishuku, Susono, Shizuoka 410-1193, Japan

teranisi@chem.tsukuba.ac.jp

Received October 16, 2007

Abstract:

Exchange-coupled fct-FePd/-Fe nanocomposite magnets were fabricated by converting anisotropically phase-segregated Pd/-Fe₂O₃ nanoparticles via the interfacial atom diffusion. The magnetically hard fct-FePd phases formed by the interdiffusion between -Fe and fcc-Pd phases nearly preserve their sizes at the nanometer scale because they are surrounded by the -Fe matrix. The VSM measurements reveal that the exchange coupling between the soft and hard phases has been realized.

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