The coercivity of rapidly quenched alloys

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Abstract
High coercivities were obtained in partly amorphous ribbons that had been melt spun at and in a water-quenched rod, whereas low coercivities were obtained in fully amorphous ribbons that had been melt spun at high wheel speeds . High coercivities were measured for the water-quenched and the chill-cast rods. This result indicates that the coercivity of the Nd-Fe-Al alloy is strongly dependent on the quenching rate. The magnetic properties of the water-quenched rod were studied as functions of temperature. The coercivity increased from at room temperature to at liquid nitrogen temperature. The ribbon that had been melt spun at possessed a coercivity of (4.1 Tesla) at 78 K. Such high coercivities were attributed to a large local magnetic anisotropy which is probably produced by Nd atoms.