Nanocrystalline Fe-M-B-Cu (M=Zr,Nb) alloys with improved soft magnetic properties

Akihiro Makino, Teruo Bitoh, Akihisa Inoue, Tsuyoshi Masumoto

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

The soft magnetic properties of the nanocrystalline Fe-M-B (M=Zr,Nb) alloys, which exhibit a high saturation flux density (B s ) above 1.5 T as well as a high effective permeability (μ e ) above 30 000 at 1 kHz, were found to be improved by adding small amounts of Cu and by optimizing the chemical composition. The addition of Cu to the alloys decreases the bcc grain size. The excellent soft magnetic properties (a high μ e of 100 000 at 1 kHz combined with a high B s of 1.53 T) can be achieved in the region where small grain size, as well as nearly zero-magnetostriction are obtained, which is attained in the compositional range around Fe 84 Nb 3.5 Zr 3.5 B 8 Cu 1 . The soft magnetic properties can be further improved by low temperature annealing before the crystallization treatment, probably as a result of a decreased grain size distribution in the crystallized state. Consequently, the μ e reaches the maximum value of 120 000 for the nanocrystalline Fe 84 Nb 3.5 Zr 3.5 B 8 Cu 1 alloy.

Original languageEnglish
Pages (from-to)2736-2739
Number of pages4
JournalJournal of Applied Physics
Volume81
Issue number6
DOIs
Publication statusPublished - 1997 Mar 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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