HfCo7-based rare-earth-free permanent-magnet alloys

B. Das, B. Balamurugan, Pankaj Kumar, R. Skomski, V. R. Shah, J. E. Shield, A. Kashyap, D. J. Sellmyer

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25 Scopus citations

Abstract

This study presents the structural and magnetic properties of melt-spun HfCo7, HfCo7-xFex (0.25 ≤ x ≤ 1), and HfCo7Six (0.2 ≤ x ≤ 1.2) alloys. Appreciable permanent-magnet properties with a magnetocrystalline anisotropy of about 9.6-16.5 Mergs/cm3, a magnetic polarization Js ≈ 7.2-10.6 kG, and coercivities Hc = 0.5-3.0 kOe were obtained by varying the composition of these alloys. Structural analysis reveals that the positions of x-ray diffraction peaks of HfCo7 show good agreement with those corresponding to an orthorhombic structure having lattice parameters of about a = 4.719 Å, b = 4.278 Å, and c = 8.070 Å. Based on these results, a model crystal structure for HfCo7 is developed and used to estimate the magnetic properties of HfCo7 using density-functional calculations, which agree with the experimental results.

Original languageEnglish (US)
Article number6558898
Pages (from-to)3330-3333
Number of pages4
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
StatePublished - Aug 2 2013

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Keywords

  • Doping
  • Magnetocrystalline anisotropy
  • Permanent magnets
  • Rare-earth-free alloys

ASJC Scopus subject areas

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

Cite this

Das, B., Balamurugan, B., Kumar, P., Skomski, R., Shah, V. R., Shield, J. E., Kashyap, A., & Sellmyer, D. J. (2013). HfCo7-based rare-earth-free permanent-magnet alloys. IEEE Transactions on Magnetics, 49(7), 3330-3333. [6558898]. https://doi.org/10.1109/TMAG.2013.2242856