Hard magnetic bulk amorphous alloys

Akihisa Inoue; Tao Zhang; Akira Takeuchi

doi:10.1109/20.619580

Hard magnetic bulk amorphous alloys

Akihisa Inoue, Tao Zhang, Akira Takeuchi

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

46 Citations (Scopus)

Abstract

An amorphous phase in Ln-Fe-Al (Ln=Nd and Pr) systems is formed in wide composition ranges of 0 to 90 at% Fe and 0 to 93 at% Al by melt spinning. Ferromagnetic Ln_90-xFe_xAl₁₀ bulk amorphous alloys with high coercive force (_lH_c) at room temperature are obtained by copper mold casting. The maximum diameter of the cylindrical amorphous samples is 12 mm for the Nd-30%Fe-Al alloy and 3 mm for the Pr-30%Fe-Al alloys and decreases with deviating Fe content The extremely high T_x/T_m and small ΔT_m(=T_m-T_x), which are evaluated by the crystallization (T_x) temperature (T_x) and melting temperature (T_m) , are the reason for the achievement of large glass-forming ability in these systems. The bulk amorphous Ln₆₀Fe₃₀AJ₁₀ alloys are ferromagnetic with the Curie temperature of 515 to 600 K which are higher than those for Nd-Fe and Pr-Fe binary amorphous ribbons. The remanence and _lH_c are 0.089 to 0.122 T and 277 to 321 kA/m, respectively, and the crystallization to Ln+Al₂Ln+δ causes a ferromagnetic- to -paramagnetic transition. Thus, the hard magnetic properties are achieved only in the amorphous state.

Original language	English
Pages (from-to)	3814-3816
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	33
Issue number	5 PART 2
DOIs	https://doi.org/10.1109/20.619580
Publication status	Published - 1997
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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title = "Hard magnetic bulk amorphous alloys",

abstract = "An amorphous phase in Ln-Fe-Al (Ln=Nd and Pr) systems is formed in wide composition ranges of 0 to 90 at% Fe and 0 to 93 at% Al by melt spinning. Ferromagnetic Ln90-xFexAl10 bulk amorphous alloys with high coercive force (lHc) at room temperature are obtained by copper mold casting. The maximum diameter of the cylindrical amorphous samples is 12 mm for the Nd-30%Fe-Al alloy and 3 mm for the Pr-30%Fe-Al alloys and decreases with deviating Fe content The extremely high Tx/Tm and small ΔTm(=Tm-Tx), which are evaluated by the crystallization (Tx) temperature (Tx) and melting temperature (Tm) , are the reason for the achievement of large glass-forming ability in these systems. The bulk amorphous Ln60Fe30AJ10 alloys are ferromagnetic with the Curie temperature of 515 to 600 K which are higher than those for Nd-Fe and Pr-Fe binary amorphous ribbons. The remanence and lHc are 0.089 to 0.122 T and 277 to 321 kA/m, respectively, and the crystallization to Ln+Al2Ln+δ causes a ferromagnetic- to -paramagnetic transition. Thus, the hard magnetic properties are achieved only in the amorphous state.",

author = "Akihisa Inoue and Tao Zhang and Akira Takeuchi",

year = "1997",

doi = "10.1109/20.619580",

language = "English",

volume = "33",

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journal = "IEEE Transactions on Magnetics",

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publisher = "Institute of Electrical and Electronics Engineers Inc.",

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AU - Zhang, Tao

AU - Takeuchi, Akira

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AB - An amorphous phase in Ln-Fe-Al (Ln=Nd and Pr) systems is formed in wide composition ranges of 0 to 90 at% Fe and 0 to 93 at% Al by melt spinning. Ferromagnetic Ln90-xFexAl10 bulk amorphous alloys with high coercive force (lHc) at room temperature are obtained by copper mold casting. The maximum diameter of the cylindrical amorphous samples is 12 mm for the Nd-30%Fe-Al alloy and 3 mm for the Pr-30%Fe-Al alloys and decreases with deviating Fe content The extremely high Tx/Tm and small ΔTm(=Tm-Tx), which are evaluated by the crystallization (Tx) temperature (Tx) and melting temperature (Tm) , are the reason for the achievement of large glass-forming ability in these systems. The bulk amorphous Ln60Fe30AJ10 alloys are ferromagnetic with the Curie temperature of 515 to 600 K which are higher than those for Nd-Fe and Pr-Fe binary amorphous ribbons. The remanence and lHc are 0.089 to 0.122 T and 277 to 321 kA/m, respectively, and the crystallization to Ln+Al2Ln+δ causes a ferromagnetic- to -paramagnetic transition. Thus, the hard magnetic properties are achieved only in the amorphous state.

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Hard magnetic bulk amorphous alloys

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