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

作者：Stognei O V^*; Sitnikov A V

来源：Physics of the Solid State, 2010, 52(12): 2518-2526.

DOI：10.1134/S1063783410120127

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/m(3) for the (Co41Fe39B20) (x) (SiO (n) )(100 - x) composites and 5-8 kJ/m(3) 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

• 出版日期2010-12