Magnetic properties of mechanically milled Sm-Co permanent magnetic materials with the TbCu7 structure

Raphael Justin Joseyphus, Alwarramanujam Narayanasamy, Raghavan Gopalan, Venkatasubramanian Chandrasekaran, Balachandran Jeyadevan, Kazuyuki Tohji

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The magnetic properties of Sm(Co,Fe,Cu,Zr)7 compound with the TbCu7 structure are studied for the mechanically milled samples. The coercivity could be varied, without affecting the saturation magnetization, from 44 kA/m for the micron sized particles to 280kA/m by reducing the particle size to sub-micron size (600-900 nm) using high-energy ball milling. The enhancement in the coercivity is attributed to the particles approaching single domain size. The presence of dipolar coupling suggests that the grain sizes are well above the exchange length for the milled samples. The thermal measurements indicate that the compound with the TbCu7 structure is not stable at high temperatures beyond 743 K.

Original languageEnglish
Pages (from-to)2264-2268
Number of pages5
JournalMaterials Transactions
Issue number9
Publication statusPublished - 2006 Sep


  • Dipolar coupling
  • Mechanical milling
  • Permanent magnetic materials
  • TbCu structure

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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