Do thermal fluctuations influence the recoil loops of nanocomposite magnets? | Zendy

Chuanbing Rong | Zendy; Yuzi Liu | Zendy; J. Ping Liu | Zendy

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Do thermal fluctuations influence the recoil loops of nanocomposite magnets?

Author(s) -

Chuanbing Rong,

Yuzi Liu,

J. Ping Liu

Publication year - 2008

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.2956392

Subject(s) - recoil , nanocomposite , materials science , magnet , phase (matter) , condensed matter physics , alnico , thermal , nanotechnology , thermodynamics , physics , atomic physics , quantum mechanics

An exchange-coupled FePt∕Fe3Pt nanocomposite system with well defined hard/soft two-phase morphology was prepared by reducing chemically synthesized FePt∕Fe3O4 bimagnetic nanoparticles. It was interesting to observe that the recoil loop openness is strongly dependent on the sweep rate of applied fields. A quantitative analysis shows a linear relation between the openness of recoil loops and the reciprocal activation volume, indicating that the recoil loops are intimately related to thermal fluctuation. The large open area of the recoil loops for nanocomposite magnets compared to that of single phase magnets is attributed to the unstable magnetic moments in the soft phase.

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