RETRACTED: Study on the magnetic viscosity of Nd45Pr15Fe30-xCoxAl10 (x=0, 10) bulk amorphous Alloys (Retracted article. See vol. 430, pg. 115, 2013)

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 (chi(irr)) 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 H-f increased from 9.9 mT to 11.5 mT, and the activation volume V-a increased from 2.9 x 10(-18) cm(3) to 3.6 x 10(-18) cm(3), which leads to an increase of the activation diameter D-a from 17.7 nm to 19.0 nm. The value of D-a 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. (C) 2013 Elsevier B.V. All rights reserved.