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

The magnetic properties of Nd60−xYxFe30Al10 (x=0, 10, 30) melt-spun ribbons were studied. The ribbons contain two amorphous magnetic phases characterized by their Curie temperature TC1 and TC2. The Y atoms may be unevenly distributed in the two magnetic phases. The Y atoms prefer to substitute Nd in the low TC1 phase. Thermo-history effects are found in the thermomagnetic curves for field-cooled and zero-field-cooled samples. The bifurcation temperature Tb decreases with Y addition, suggesting a decrease of the anisotropy energy and the coercivity. The room-temperature coercivity and remanence ratio also strongly decrease with Y addition. The apparent coercivity μ0HC for x=0 first increases with decreasing temperature, reaching a maximum at about 60 K, near the Curie temperature of the TC1 phase, then strongly decreases in the two-magnetic phase region. The coercivity mechanism is assumed as domain-wall pinning effect.

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