New Fe-metalloids based nanocrystalline alloys with high Bs of 1.9 T and excellent magnetic softness

Akihiro Makino, He Men, Takeshi Kubota, Kunio Yubuta, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

121 Citations (Scopus)

Abstract

The melt-spun Fe83.3-84.3 Si4 B8 P3-4 Cu0.7 alloys have a heterogeneous amorphous structure including a large amount of α-Fe -like clusters. Compared with the FeSiB alloys, the particle size rapidly decreases from several hundred nanometers to 2-3 nm due to the proper amounts of simultaneous P and Cu additions. By controlling the crystallization process, a homogeneous nanocrystalline structure composed by small α-Fe grains with size of 10-17 nm in diameter can be realized from the heterogeneous amorphous alloys. The nanocrystallized Fe83.3-84.3 Si4 B8 P3-4 Cu0.7 alloys show the extremely high saturation magnetic flux density of 1.88-1.94 T sufficiently near to 1.97 T of Fe-3.5 mass %Si crystalline soft magnetic alloys, and exhibit low coercivity of less than 10 Am and higher effective permeability of 16 000-25 000 at 1 kHz due to the simultaneous realization of the homogeneous nanocrystalline structure and the small magnetostriction of (2-3) × 10-6. In addition, the nanocrystalline alloys exhibit the superior core loss to the representative Fe78 Si9 B13 amorphous alloy at 50 Hz.

Original languageEnglish
Article number07A308
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
Publication statusPublished - 2009 Apr 27

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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