Critical behavior of Fe15Ni65B18Si2 ferromagnetic glass |
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Authors: | ? Marohni? Ð Drobac E Babi? K Zadro |
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Institution: | Institute of Physics of the University, P.O.B. 304, 41001 Zagreb, Yugoslavia |
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Abstract: | AC susceptibility, magnetization and electrical resistivity around the Curie temperature (Tc) were measured for Fe15Ni65B18Si2 glass. The results yield Tc = (307.6±0.1) K and the following critical exponents γ = 1.50±0.03, β = 0.375±0.01, δ = 5.1±0.1 andα = -0.29±0.05. These values were obtained in the reduced temperature interval . In spite of the fact that these values for the critical exponents were obtained from different measurements they obey the equality relations γ = β(δ?1) and γ+2β+α = 2. Reduced magnetisation and field follow a magnetic equation of state derived for a second-order phase transition over a wide temperature range. This set of critical exponents is compared with those derived from the Heisenberg model as well as with the usual ones for a pure crystalline ferromagnets. The comparison shows that the values of |α| and γ, for our alloy, are considerably larger than those from the model and the usual crystalline ones. A similar difference is also observed in some other amorphous and dilute crystalline ferromagnets and is probably due to magnetic inhomogeneities. |
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