Nanocrystalline soft magnetic materials with a saturation magnetization greater than 2 T

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Abstract

The effect of Co on the magnetic properties of ultra-rapidly annealed (heating rate > 104K/s, annealing time < 1 s) nanocrystalline (Fe1−xCox)87B13 with x = 0–0.5 has been investigated. A saturation magnetic polarization of 2.02 T is observed for x = 0.2 while maintaining a coercivity of 9.3 A/m. This represents a 0.1 T increase over existing Co-free HiB-Nanoperm alloys with a B content of 13 at.% and is directly comparable to conventional crystalline Fe-3 wt%Si. Ultra-rapid annealing is shown to be a requirement for producing magnetically soft materials in this alloy system. The effect of Cu on ultra-rapidly annealed nanocrystalline (Fe0.8Co0.2)87−yB13Cuy where y = 0–1.5 is also investigated. It is found that Cu is effective at improving the magnetic softness of Co-containing HiB-Nanoperm, with y = 1 displaying a Hc of 7 A/m and a saturation magnetic polarization of 2.0 T.

Original languageEnglish
Pages (from-to)180-186
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume485
DOIs
Publication statusPublished - 1 Sep 2019

Keywords

  • Amorphous
  • Cobalt
  • Nanocrystalline
  • Rapid annealing
  • Saturation magnetization
  • Soft magnetic material

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