Structural, transport and magnetic properties of (Fe100-xVx)75P15 C10 amorphous ribbons

Abstract

Structural, thermal, transport and magnetic properties of (Fe100-xVx)75P15C10 (x=0, 5, 10 and 15) amorphous ribbons prepared by melt spinning technique were studied. The XRD of the as prepared samples shows a broad peak that confirms the samples are in amorphous nature. The re-crystallization phenomenon of the alloys was studied by XRD for annealing temperatures from 400 to 650 °C for 30 minutes annealing time. The XRD pattern shows that all compositions remain in the b.c.c phase within the annealing temperature range between 400 and 450 °C, and transform into hexagonal phase within the annealing temperature range between 500 and 650 °C. The lattice parameter ‘a’ of the b.c.c structure changes from 2.854 to 2.870 Å. The lattice parameters ‘a’ and ‘c’ of the hexagonal structure are (5.011-5.045) Å and (13.676- 13.822) Å, respectively. The grain size is found to vary from 10 to 60 nm depending on the annealing temperature. The DTA curves of the as prepared samples show an exothermic peak for each sample. The crystallization temperatures increase with the increases of V content. Surface micrograph of the as prepared samples shows that porosity decreases with the increase of V content. The resistivity at room temperature of the as prepared samples increases with the increase of V content and attributed to the isotropic, anisotropic and topological scattering of the conduction electrons. The resistivity of the as prepared samples follows Mooij-correlation in the temperature range 298-93K. The magnetoresistance of the as prepared samples vary from 0 to 8% which is typical of metallic glass system. The origin of magnetoresistance is assumed to be magnon-electron and/or phonon-electron interaction. Room temperature Hall resistivity of the as prepared samples show anomalous Hall effect due to the impurity, phonon and spin disorder scattering. The skew-scattering and the side-jump mechanism are also responsible for anomalous Hall effect. Room temperature saturation magnetization of the as prepared samples decreases with the increase of V content. This decrease is due to the replacement of ferromagnetic Fe by paramagnetic V and also due to the reduction of the overall interatomic exchange interaction.