Magnetic and electrical study of amorphous metallic alloys CoBV and CoBTi

Abstract

Investigations on the temperature dependences of the magnetization of the rapidly quenched alloys (Co 85B 15) 100− x V x ( x = 5, 10, 15, 20, 25) and (Co 85B 15) 100− x Ti x ( x = 10, 15, 20) reveal that vanadium suppresses the magnetization more strongly than titanium. The values of the Curie temperature ranging up to 900 K for x = 5 are at least 150 K lower for the V- than for the Ti-containing alloys. The magnetic moments decrease monotonically with the V and Ti content and are lower in V-based alloys. The threshold crystallization temperatures of the alloys studied are relatively high, exceeding 580 K. At low vanadium and titanium content, the electrical resistivity and thermoelectric power vary proportionally to T 2, whereas for higher values of x they become a linear function of temperature. Changes in the temperature dependence of the resistivity and the thermoelectric power are observed at the Curie temperature. Correlations between the thermoelectric power and electrical resistivity are discussed.