Bimagnetic nanoparticles with enhanced exchange coupling and energy products | Zendy

Vikas Nandwana | Zendy; Girija S. Chaubey | Zendy; Kazuaki Yano | Zendy; Chuanbing Rong | Zendy; J. Ping Liu | Zendy

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Bimagnetic nanoparticles with enhanced exchange coupling and energy products

Author(s) -

Vikas Nandwana,

Girija S. Chaubey,

Kazuaki Yano,

Chuanbing Rong,

J. Ping Liu

Publication year - 2009

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.3054441

Subject(s) - nanoparticle , nanocomposite , superparamagnetism , materials science , magnetic nanoparticles , coupling (piping) , chemical engineering , nanotechnology , phase (matter) , composite material , magnetization , chemistry , magnetic field , organic chemistry , physics , quantum mechanics , engineering

Bimagnetic FePt/Fe3O4 nanoparticles with core/shell or heterodimer structure have been prepared using a sequential synthetic method. The dimension of both FePt and Fe3O4 was tuned by varying the synthesis parameters. The as-synthesized bimagnetic nanoparticles were superparamagnetic at room temperature. After being annealed in a reducing atmosphere, the FePt/Fe3O4 bimagnetic nanoparticles were converted to a hard magnetic nanocomposite with enhanced energy products due to the exchange coupling between the hard and soft magnetic phases. It was found that the exchange coupling in nanocomposites made from the core/shell nanoparticles is stronger than that from the heterodimer nanoparticles. By tuning the dimensions of the FePt and Fe3O4 phases, the energy product up to 17.8 MGOe was achieved in the annealed nanocomposites, which is 36% higher than the isotropic single-phase FePt counterpart.

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