Mossbauer and magnetic studies of (Fe100-xCox)62 Nb8B30 (X=0,33,50) alloys

Structural and magnetic investigation of (Fe100-xCox)(62) Nb8B30 (x = 0, 33, 50) has been done using DSC, Mossbauer spectroscopy and magnetic measurements. Variation of Co content in the alloy affects the stability of the alloy against crystallization as well as supercooled liquid region ranging between 68 and 102 degrees C. Addition of Co affects the disorder in the as-cast specimens whereas annealing reduces disorder in the specimens via structural relaxation. Co addition also stabilizes the spin texture in the specimen in such a way that it is less sensitive to thermal annealing. In as-cast state, higher Co content lea-is to the improvement of soft magnetic properties whereas thermal annealing further improves the magnetic properties via structural relaxation. (c) 2004 Elsevier B.V. All rights reserved.