Iron-based P/M soft magnetic material for electric devices operating at high frequencies

Tomoyuki Ishimine, Toru Maeda, Haruhisa Toyoda, Kouji Mimura, Takao Nishioka, Satoshi Sugimoto

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Citations (Scopus)


Recently, there has been a growing demand for soft magnetic materials with high conversion characteristics in the high-frequency range due to the trend where electric devices are being operated at higher frequencies. P/M soft magnetic materials, which were developed for such devices, utilizing iron-based powder and alloy powder. Through this work, we were able to reduce core loss and achieve remarkable magnetic characteristics in the high frequency range. Core loss, which includes hysteresis loss and eddy-current loss, is predominant in the high-frequency range. Two methods can be used to reduce eddy-current loss: using fine-grained powder, and using high-resistivity powder. However, both these present compressibility problems, with high-resistivity iron-based alloy powders such as Fe-Si being particularly poor in deformability. By studying composition of the material, we successfully developed a material that offers both high resistivity and high compressibility, reduction of core loss by more than 20% over the conventional material was achieved.

Original languageEnglish
Title of host publicationProgress in Powder Metallurgy - Proceedings of the 2006 Powder Metallurgy World Congress and Exhibition (PM 2006)
PublisherTrans Tech Publications Ltd
Number of pages4
EditionPART 2
ISBN (Print)0878494197, 9780878494194
Publication statusPublished - 2007
Event2006 Powder Metallurgy World Congress and Exhibition, PM 2006 - Busan, Korea, Republic of
Duration: 2006 Sept 242006 Sept 28

Publication series

NameMaterials Science Forum
NumberPART 2
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Conference2006 Powder Metallurgy World Congress and Exhibition, PM 2006
Country/TerritoryKorea, Republic of


  • Core loss
  • High-frequency characteristics
  • Soft magnetic material


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