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Anisotropy of amorphous nanogranular composites CoNbTa-SiO n and CoFeB-SiO n

  • Magnetism and Ferroelectricity
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Abstract

A comparative investigation of the magnetic properties of amorphous nanogranular composites (Co41Fe39B20) x (SiO n )100 − x and (Co86Nb12Ta2) x (SiO n )100 − x has been performed in the subpercolation region at temperatures in the range 4.2–300 K. The thermomagnetic dependences in the range 4.2–300 K and the processes of magnetization reversal and remanent magnetization relaxation at liquid-helium temperatures have been studied. It has been established that the average anisotropy constants of amorphous nanograins are equal to 3.6–7.0 kJ/m3 for the (Co41Fe39B20) x (SiO n )100 − x composites and 5–8 kJ/m3 for the (Co86Nb12Ta2) x (SiO n )100 − x composites. The fundamental differences in the concentration dependences of the anisotropy constant K eff and the coercive force H C have been revealed for the two systems under investigation. It has been demonstrated that, as the concentration of the metal phase increases, the quantities K eff and H C increase for the (Co86Nb12Ta2) x (SiO n )100 − x composites and decrease for the (Co41Fe39B20) x (SiO n )100 − x composites.

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Authors and Affiliations

  1. Voronezh State Technical University, Moskovskii pr. 14, Voronezh, 394026, Russia

    O. V. Stognei & A. V. Sitnikov

Authors
  1. O. V. Stognei
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  2. A. V. Sitnikov
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Correspondence to O. V. Stognei.

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Original Russian Text © O.V. Stognei, A.V. Sitnikov, 2010, published in Fizika Tverdogo Tela, 2010, Vol. 52, No. 12, pp. 2356–2364.

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Stognei, O.V., Sitnikov, A.V. Anisotropy of amorphous nanogranular composites CoNbTa-SiO n and CoFeB-SiO n . Phys. Solid State 52, 2518–2526 (2010). https://doi.org/10.1134/S1063783410120127

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  • DOI: https://doi.org/10.1134/S1063783410120127

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