The Curie Temperature of Magnetically Inhomogeneous Amorphous Fe-Zr-B Alloys

The Curie temperature of amorphous Fe-Zr-B alloys was determined by both the Mossbauer thermal scan and a modified Arrott-plots methods. For amorphous Fe_(Zr_B_x)_8 alloys, the two methods make a difference between the values of T_c. On the other hand, for amorphous Fe_(Zr_B_x)_ alloys, the results of the two methods agree with each other within limits of the experimental error. It is found that the magnetic inhomogeneity often causes the difficulty in the determination of T_c and the measurement of T_c necessitating external fields is accompanied by a serious problem in the case of the magnetically inhomogeneous materials. Since no external field is necessary, the Mossbauer thermal scan method is very useful for determining T_c of amorphous alloys containing Fe atoms