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Magnetic, structural and microstructural properties of FePt/M (M=C,BN) granular films

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8 Author(s)
Christodoulides, J.A. ; Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA ; Farber, P. ; Dannl, M. ; Okumura, H.
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Nanocomposite FePt/C and FePt/BN thin films have been fabricated by dc and rf magnetron sputtering on naturally-oxidized Si(100) substrates. Particles consisting of the highly anisotropic tetragonal L1 0 FePt phase were obtained by annealing the as-made multilayers by a conventional vacuum furnace in the temperature range of 500 to 800°C. By controlling the annealing conditions, samples with grain size in the range of 3 to 20 nm were obtained, with coercivities between 2 and 16 kOe. The evolution of crystal structure during annealing at 600°C was studied in FePt/C and the dependence of a, c and c/a on annealing time were determined. These data were used to estimate the degree of ordering which was found to increase with aging, but with a maximum value less than the bulk value, explaining thus the lower Hc in the nanoparticles

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )