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Effective magnetic anisotropy of annealed FePt nanoparticles

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2 Author(s)
Usov, N.A. ; Departamento de Electricidad y Electrónica, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080 Bilbao, Spain ; Barandiaran, J.M.

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The hysteresis loops of randomly oriented assembly of FePt nanoparticles are calculated numerically as a function of particle diameter for the range of the effective anisotropy constants, Kef = 1-5 × 107 erg/cm3, taking into account the effect of thermal fluctuations. Very sharp dependence of the assembly coercive force on the particle diameter is found for Kef  ≥ 3 × 107 erg/cm3. The effective anisotropy constant of annealed FePt nanoparticle is estimated assuming the existence of L10 inclusions distributed randomly in a magnetically soft surrounding matrix. The hysteresis loop evolution can be explained if the total volume of the L10 grains is supposed to increase during annealing.

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Applied Physics Letters  (Volume:101 ,  Issue: 17 )