Structure and Magnetic Properties of Y60Fe30Al10 Melt-Spun Ribbons

Abstract

The structural and magnetic properties of Y60Fe30Al10 melt‐spun ribbons have been studied in this work. Fully amorphous alloys were obtained after melt‐spinning at higher speeds (>15 m/s). Ribbons melt‐spun at lower speeds consisted of a mixture of amorphous and crystalline yttrium. The yttrium crystallites in the ribbon melt‐spun at 5 m/s possessed a strong crystallographic texture. The crystallization of the amorphous phase led to the formation of a mixture of crystalline yttrium and a ternary Y–Fe–Al phase. By Mössbauer study, the quadrupole splitting and isomer shift of the amorphous phase increased with decreasing melt‐spinning speed, indicating a possible change in microstructure. The magnetization curves of Y60Fe30Al10 ribbons could be described with superparamagnetism, suggesting that iron‐rich clusters might be present in the amorphous phase.

Thermal stability and magnetic properties of Gd–Fe–Al bulk amorphous alloys

“…It is not clear yet why Gd-Fe-Al amorphous alloys exhibit the superparamagnetism-like behavior. However, similar experimental results were reported about the amorphous ribbons of NdFeAl [16], Y 60 Fe 30 Al 10 [17] and GdFeAl [18] alloy systems, in which the origin of the superparamagnetism is due to the formation of Fe-rich magnetic clusters embedded in a paramagnetic amorphous matrix [19][20][21]. It can be expected that similar mechanism may play a role in the Gd-Fe-Al bulk amorphous alloys.…”

A superferromagnetic approach for rapidly quenched Y60Fe30Al10alloys

“…Similar results have been found in melt spun (Nd, Pr)-Fe-(Si, Al) ribbons (Li et al 1998. Studies on magnetization and demagnetization processes, magnetic viscosity measurements and Mössbauer investigation suggested the formation of clusters in the amorphous matrix (Inoue 1995, Li et al 1998, Yoshiike S et al 1998, Wang L et al 1999, Li et al 1999b.…”

“…In our previous work, Nd was replaced by the non-magnetic element Y, and Y 60 Fe 30 Al 10 ribbons were prepared at different surface wheel speeds by using a single wheel melt spinner (Li et al 1999b). The magnetization curves indicated the presence of Fe rich clusters.…”

“…However, § Corresponding author. 0953-8984/00/184253+10$30.00 © 2000 IOP Publishing Ltd they could not be well fitted with the conventional Langevin function (Li et al 1999b, Kneller 1962, Chikazumi 1964. Yoshiike et al (1998) have reported that the magnetization curves of rapidly quenched Pr-Fe alloys could be fitted with a modified Langevin function with a Weiss interaction field, probably due to strong interactions between Fe rich clusters.…”

Magnetic properties of Nd60−xYxFe30Al10 (x=0,10,30) melt-spun ribbons containing two amorphous magnetic phases

“…[1][2][3][4][5][6][7] The coercivity of amorphous Nd-Fe-Al materials is found to be sensitively dependent on the cooling rate. For example, hard magnetic behavior is only exhibited in as-cast amorphous cylinders or ribbons quenched at relatively low cooling rate.…”