Phase composition and nanostructure of Zr₂Co₁₁-based alloys

Authors

Y.L. Jin, University of Nebraska-LincolnFollow
Wenyong Zhang, University of Nebraska-LincolnFollow
Ralph A. Skomski, University of Nebraska-LincolnFollow
Shah R. Valloppilly, University of Nebraska-LincolnFollow
Jeffrey E. Shield, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

ORCID IDs

Y. L. Jin

Date of this Version

2014

Citation

JOURNAL OF APPLIED PHYSICS 115, 17A739 (2014)

Abstract

The effect of Mo addition on phase composition and nanostructure of nanocrystalline Zr₁₆Co_84-xMo_x (x=0–2.0) melt spun at 55 m/s has been investigated. All the ribbons consist mainly of a hard magnetic Zr₂Co₁₁ phase with rhombohedral crystal structure but also contain minor amounts of soft-magnetic phases. The increase in cell volume on alloying suggests that Mo mainly enters the rhombohedral Zr₂Co₁₁ structure and occupies the Co site. Mo addition promotes the formation of the hard magnetic phase and increases its volume fraction. The mean grain size of the hard magnetic phase remains almost unchanged with the increase of Mo content. But the average grain size of the soft magnetic phase decreases from about 200nm to 50 nm. This promotes the exchange coupling of the hard and soft magnetic phases and thus leads to a significant increase in coercivity and isotropic energy product, from 0.6 kOe and 0.5 MGOe for x=0 to 2.9 kOe and 4.2 MGOe for x=1.5