Abstract
The bulk amorphous Nd45Pr15Fe30−xCoxAl10 (x=0, 10) alloys, which were prepared by arc melting and investigated by XRD and VSM, present hard magnetic behavior at room temperature. The intrinsic coercivity of the bulk amorphous increased with increasing Co addition. A single sharp and narrow peak close to the coercivity appeared in the irreversible susceptibility (χirr) curve for each alloy. The addition of Co has little influence on the magnetic viscosity of the alloys. With the substitution of Co for Fe, the fluctuation field Hf increased from 9.9mT to 11.5mT, and the activation volume Va increased from 2.9×10–18cm3 to 3.6×10–18cm3, which leads to an increase of the activation diameter Da from 17.7nm to 19.0nm. The value of Da deduced from the magnetic viscosity measurements is similar to the size of clusters of Nd-based bulk amorphous alloys, which may be responsible for the hard magnetic property exhibited at room temperature.
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