Formation, crystallized structure and magnetic properties of Fe-Pt-B amorphous alloys

Akihisa Inoue; Wei Zhang; Takako Tsurui; Dmitri V. Louzguine

doi:10.2320/matertrans.46.891

Formation, crystallized structure and magnetic properties of Fe-Pt-B amorphous alloys

Akihisa Inoue, Wei Zhang, Takako Tsurui, Dmitri V. Louzguine

Advanced Institute for Materials Research (AIMR)

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

An amorphous phase was formed for (Fe_0.75Pt_0.25) _100-xB_x (x = 25 and 30) alloys by melt-spinning. Their crystallization temperature were 671 and 667 K, respectively. The amorphous alloys exhibited good soft magnetic properties. The crystallized structure consisted of _γ1 -FePt (fct), Fe₂B and γ-FePt (fcc) phases, and their average grain sizes were about 15 nm after annealing at 785 K for 900 s. The remanence (B_r), reduced remanence (M _r/M_S), coercivity (iH_c) and maximum energy product (BH)_max were 0.96 T, 0.83, 340kA/m and 102.2 kJ/m ³, respectively, for the 25 at%B alloy, and 0.91 T, 0.82, 368 kA/m and 96.5 kJ/m³, respectively, for the 30 at%B alloy. The reversible demagnetization loop behavior was also confirmed. Consequently, the good hard magnetic properties are interpreted as resulting from exchange magnetic coupling among nanoscale hard γi-FePt and soft Fe₂B and γ-FePt magnetic phases.

Original language	English
Pages (from-to)	891-894
Number of pages	4
Journal	Materials Transactions
Volume	46
Issue number	4
DOIs	https://doi.org/10.2320/matertrans.46.891
Publication status	Published - 2005 Apr

Keywords

Amorphous
Crystallized structure
Iron-platinum-boron alloy
Melt-spun
Nanocomposite permanent magnet

ASJC Scopus subject areas

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

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title = "Formation, crystallized structure and magnetic properties of Fe-Pt-B amorphous alloys",

abstract = "An amorphous phase was formed for (Fe0.75Pt0.25) 100-xBx (x = 25 and 30) alloys by melt-spinning. Their crystallization temperature were 671 and 667 K, respectively. The amorphous alloys exhibited good soft magnetic properties. The crystallized structure consisted of γ1 -FePt (fct), Fe2B and γ-FePt (fcc) phases, and their average grain sizes were about 15 nm after annealing at 785 K for 900 s. The remanence (Br), reduced remanence (M r/MS), coercivity (iHc) and maximum energy product (BH)max were 0.96 T, 0.83, 340kA/m and 102.2 kJ/m 3, respectively, for the 25 at%B alloy, and 0.91 T, 0.82, 368 kA/m and 96.5 kJ/m3, respectively, for the 30 at%B alloy. The reversible demagnetization loop behavior was also confirmed. Consequently, the good hard magnetic properties are interpreted as resulting from exchange magnetic coupling among nanoscale hard γi-FePt and soft Fe2B and γ-FePt magnetic phases.",

keywords = "Amorphous, Crystallized structure, Iron-platinum-boron alloy, Melt-spun, Nanocomposite permanent magnet",

author = "Akihisa Inoue and Wei Zhang and Takako Tsurui and Louzguine, {Dmitri V.}",

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AU - Inoue, Akihisa

AU - Zhang, Wei

AU - Tsurui, Takako

AU - Louzguine, Dmitri V.

PY - 2005/4

Y1 - 2005/4

N2 - An amorphous phase was formed for (Fe0.75Pt0.25) 100-xBx (x = 25 and 30) alloys by melt-spinning. Their crystallization temperature were 671 and 667 K, respectively. The amorphous alloys exhibited good soft magnetic properties. The crystallized structure consisted of γ1 -FePt (fct), Fe2B and γ-FePt (fcc) phases, and their average grain sizes were about 15 nm after annealing at 785 K for 900 s. The remanence (Br), reduced remanence (M r/MS), coercivity (iHc) and maximum energy product (BH)max were 0.96 T, 0.83, 340kA/m and 102.2 kJ/m 3, respectively, for the 25 at%B alloy, and 0.91 T, 0.82, 368 kA/m and 96.5 kJ/m3, respectively, for the 30 at%B alloy. The reversible demagnetization loop behavior was also confirmed. Consequently, the good hard magnetic properties are interpreted as resulting from exchange magnetic coupling among nanoscale hard γi-FePt and soft Fe2B and γ-FePt magnetic phases.

AB - An amorphous phase was formed for (Fe0.75Pt0.25) 100-xBx (x = 25 and 30) alloys by melt-spinning. Their crystallization temperature were 671 and 667 K, respectively. The amorphous alloys exhibited good soft magnetic properties. The crystallized structure consisted of γ1 -FePt (fct), Fe2B and γ-FePt (fcc) phases, and their average grain sizes were about 15 nm after annealing at 785 K for 900 s. The remanence (Br), reduced remanence (M r/MS), coercivity (iHc) and maximum energy product (BH)max were 0.96 T, 0.83, 340kA/m and 102.2 kJ/m 3, respectively, for the 25 at%B alloy, and 0.91 T, 0.82, 368 kA/m and 96.5 kJ/m3, respectively, for the 30 at%B alloy. The reversible demagnetization loop behavior was also confirmed. Consequently, the good hard magnetic properties are interpreted as resulting from exchange magnetic coupling among nanoscale hard γi-FePt and soft Fe2B and γ-FePt magnetic phases.

KW - Amorphous

KW - Crystallized structure

KW - Iron-platinum-boron alloy

KW - Melt-spun

KW - Nanocomposite permanent magnet

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Formation, crystallized structure and magnetic properties of Fe-Pt-B amorphous alloys

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