Nanocrystalline soft magnetic fc-m-b (m = zr, hf, nb)"nanoperm," fc-m-o (m = zr, hf, rare earth)alloys and their applications

A. Makino, A. Inoue, T. Masumoto

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

New soft magnetic nanocryslalline materials in Fe-M-B (M = Zr, Hf, Nb)and Fe-M-O (M = Zr, Hf, rare earth)systems have been fabricated by use of partial crystallization of melt-spun amorphous phase and sputtering-induced partial crystallization, respectively. These alloys have a mixed structure of nanoscalc ct-Fe grains and an amorphous phase containing large amount of M, B and M, O, respectively. This structural property should be a dominant factor for achieving good soft magnetic properties in both alloys. The Fe55 5Zr2Nb4B, 5 ribbon exhibits a high magnetic flux density (B,)of 1. 64 T and a high permeability of 60,000 at 1 kHz as well as a very low core loss of 0. 09 W/kg at B = 1. 4 T and 50 Hz. The soft magnetic Fe-M-O films with high O content of 10-35 at. % maintain high permeability up to the high frequency above 100 MHz because of higher electrical resistively of 6 to 23 jiQm than those of other conventional soft magnetic alloy films. The Fe-M-B ribbons "NANOPERM" should be more suitable for low frequency transformers. The Fe-M-O films are useful for high frequency applications such as thin-film inductors and transformers for micro switching converters for portable electric equipment.

Original languageEnglish
Pages (from-to)457-468
Number of pages12
JournalMaterials Research Society Symposium - Proceedings
Volume577
Publication statusPublished - 1999 Dec 1
Externally publishedYes

ASJC Scopus subject areas

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

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