Abstract
We have studied the effect of ion-beam irradiation on reducing the ordering temperature of FePt and FePtAu nanoparticles. FePt and FePt(Au14%) 4nm particles dispersed on a Si-substrate were irradiated by 300keV Al-ions with a dose of 1×1016 ions/cm2 at 43°C using a water-cooled flange in order to minimize the vacancy migration and voids formation within the collision cascades. Partial chemical ordering has been observed in as-irradiated particles with coercivity of 60–130Oe. Post-irradiation annealing at 220°C enhanced chemical ordering in FePt nanoparticles with coercivity of 3500Oe, magnetic anisotropy of 1.5×107erg/cc, and thermal stability factor of 130. A much higher 375°C post-irradiation annealing was required in FePtAu, presumably because Au atoms were trapped at Fe/Pt lattice sites at lower temperatures. As the annealing temperature increased, anomalous features in the magnetization reversal curves were observed that disappeared at higher annealing temperatures.
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