Electrical and galvanomagnetic properties of Fe100-xBx metallic glasses (13

Abstract

The concentration dependence of the absolute value of electrical resistivity \ensuremath{\rho} at room temperature, the ferromagnetic anisotropy of the resistivity (FAR) (at 300 and 77 K), and the spontaneous Hall constant ${R}_{s}$ (at 300 and 77 K) for ${\mathrm{Fe}}_{100\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{B}}_{\mathrm{x}}$ (13\ensuremath{\le}x\ensuremath{\le}26) are discussed for the first time in the same set of alloys. Theoretical calculations are made to clarify the nature of the resistivity variation with boron concentration. The trend of increasing \ensuremath{\rho} with increasing x is shown from both theory and experiments. The relation between FAR and the saturation magnetic moment ${M}_{s}$ for this series is established once again and a possible explanation is suggested for the sharpening of the peak in FAR versus x plots with decreasing temperature. ${R}_{s}$ shows a peak around x=18 and hence the lack of validity for the most commonly used correlation ${R}_{s}$=A${\ensuremath{\rho}}^{n}$ is pointed out for this series. It is clearly shown that the dominant mechanism for magnetoresistance in these metallic glasses is the usual ferromagnetic anisotropy of resistivity.