The temperature dependence of the magnetization of Fe-P, Co-P and Ni-P alloys

Abstract

Foils of Fe 100 − x , Co 100 − x P x and Ni 100 − ×P× and were prepares by Eletro-deposition with 0 < x < 28. Materials with x is purely microcrystalline, material with x > 15 is purely amorphous. So the effects of composition and structural order on the magnetic properties of these alloys could be separated. The decrease of the magnetization with increasing temperature was measured by means of a vibrating sample magnetometer. The results are discussed on the basis of the spin wave concept. To describe the deviations of the experimental results from exact T 3 2 -laws temperature dependent spin wave stiffnesses are favored. The ratios spin wave stiffness to Curie temperature proved to be characteristic constants for each of the three alloy systems. The magnetic properties of a series are mainly determined by the transition metal component. The series differ from each other in the same sense as the pure metals. The change of the properties with the phosphorus content is first of all an effect of composition and far less an effect of structural order or disorder.