Abstract
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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