Magnetism of rapidly quenched Sm1-xZrxCo5 nanocrystalline materials

W. Y. Zhang, S. Valloppilly, X. Z. Li, Y. Liu, S. Michalski, T. A. George, R. Skomski, J. E. Shield, D. J. Sellmyer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The effect of Zr addition on nanostructure and magnetic properties in nanocrystalline Sm1-xZrxCo5 (x = 0-0.6) has been investigated. (Sm, Zr)Co5 with the CaCu5 structure was synthesized by melt spinning. The lattice parameters a and b decrease with x, whereas c increases. Thus, the unit cell volume of (Sm, Zr)Co5 shrinks because the smaller Zr atoms occupy the sites of the larger Sm atoms. Zr addition decreases the grain size and induces the formation of planar defects. The coercivity decreases with x, due to weakening of magnetocrystalline anisotropy energy and effective intergrain exchange coupling. A very high coercivity of 39 kOe and energy product of 13.9 MGOe are obtained for x = 0. The remanence of (Sm, Zr)Co5 increases with x. For x ≤ 0.4, the energy product slightly decreases with x. The results show that 40% of the Sm can be replaced by the less expensive Zr, with an energy-product reduction of only 10%. In addition, the planar defects are responsible for the change of coercivity mechanism from the nucleation-type of reverse domain for the x = 0 to the pinning-type of domain wall for the x = 0.4.

Original languageEnglish (US)
Article number6558958
Pages (from-to)3353-3355
Number of pages3
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
StatePublished - 2013

Keywords

  • Coercivity
  • magnetic property
  • nanomaterials
  • rare-earth transition-metals compounds

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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