Magnetic percolation threshold and critical exponents of Ni₈₀__xFe_xB₁₈Si₂ amorphous alloys

E. Babi Department of Physics, University of Zagreb, P.O. Box 162, 41000, Zagreb, Croatia

D. Drobac Institute of Physics of the University, P.O. Box 304, 41000, Zagreb, Croatia

J. Ivkov Institute of Physics of the University, P.O. Box 304, 41000, Zagreb, Croatia

Ž Marohni Institute of Physics of the University, P.O. Box 304, 41000, Zagreb, Croatia

K. Zadro Department of Physics, University of Zagreb, P.O. Box 162, 41000, Zagreb, Croatia

Abstract

The magnetic and electronic transport properties of Ni₈₀-_xFe_xB₁₈Si₂, amorphous alloys, with x being in the vicinity of the ferromagnetic percolation threshold x_c, have been investigated. The results indicate that x_c, is close to x = 2.3 and yield well defined Curie temperatures T_c for all alloys with x ⩾ x_c. In spite of this, the critical exponent of the magnetic susceptibility γ can be determined only for the alloys with x ⩾ 2.6. The value of γ for these alloys is independent of x and is close to that calculated for a three-dimensional Heisenberg ferromagnet.

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Magnetic percolation threshold and critical exponents of Ni₈₀__xFe_xB₁₈Si₂ amorphous alloys

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Magnetic percolation threshold and critical exponents of Ni₈₀__xFe_xB₁₈Si₂ amorphous alloys