High-frequency magnetic properties of soft magnetic cores based on nanocrystalline alloy powder prepared by thermal oxidation

T. H. Kim, K. K. Jee, Yoon B. Kim, Dong Jin Byun, J. H. Han

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

FeSiBNbCu nanocrystalline alloy powder was thermally oxidized in an air atmosphere to enhance an oxide layer formation on the surface of the powder and subsequently toroidal shape FeSiBNbCu nanocrystalline alloy powder cores were prepared by compaction at room temperature. The phase change on the surface of FeSiBNbCu nanocrystalline alloy powder by thermal oxidation was analyzed and its effect on the high frequency magnetic properties of the compacted cores was investigated. By thermal oxidation, the formation of the oxide layer consisting of Fe2O3, CuO, and SiO2 on the surface of FeSiBNbCu nanocrystalline alloy powder was enhanced and the thickness of oxide layer could be controlled by changing the thermal oxidation time. FeSiBNbCu nanocrystalline alloy powder core prepared from the powder treated by thermal oxidation exhibits a stable permeability up to high frequency range over 10 MHz. The core loss could be reduced remarkably and the dc-bias property could be improved significantly, which were due to the formation of oxide layer consisting of Fe2O3, CuO, and SiO2 on the FeSiBNbCu nanocrystalline alloy powder. The improvement in high-frequency magnetic properties of the FeSiBNbCu nanocrystalline alloy powder cores could be attributed to the effective electrical insulation by oxide layer between the FeSiBNbCu nanocrystalline alloy powders.

Original languageEnglish
Pages (from-to)2423-2427
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume322
Issue number16
DOIs
Publication statusPublished - 2010 Aug 1

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Keywords

  • Core loss
  • Insulation
  • Nanocrystalline alloy
  • Permeability
  • Soft magnetic core
  • Thermal oxidation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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