The Hall effect in PdSi based amorphous alloys containing Co

The Hall effect in amorphous Pd_80–xSi₂₀Co_x, wherex=8, 9, 10, 12, 15, 20 (at.% are implied throughout) alloys was investigated. The measurements were carried out at r.t. in fields up to 17·5 kGauss. The variation of the Hall fieldE_H vs magnetic fieldB shows features typical for bulk ferromagnetics. The Hall constantR₁ describing the extraordinary effect ranges from 0·29 to 27·64 (×10^–/4 in cm³/A. sec both) reaching its maximum value for the alloy withx= =12. The interpretation of theE_H vsB curves obtained is based on a model with magnetic clusters carrying giant magnetic moments. These clusters are considered to have close relation to the clusters observed by electron microscopy. Magnetic moment of an average magnetic cluster is estimated to be of the order of 1000_B for the alloys with more than 9 at.% Co.