Size dependence of soft to hard magnetic transition in (Nd, Pr)-fe-al bulk amorphous alloys

Akira Takeuchi; Akihisa Inoue

doi:10.1016/j.msea.2003.10.201

Size dependence of soft to hard magnetic transition in (Nd, Pr)-fe-al bulk amorphous alloys

Akira Takeuchi, Akihisa Inoue

ENG - Quantum Science and Energy Engineering

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

26 Citations (Scopus)

Abstract

Magnetic properties of (Nd, Pr)_60-70Fe_30-20Al₁₀ amorphous alloys were studied for bulk specimens prepared by arc-melting. The bulk specimens with thicknesses ranging from 100μm to 6mm were prepared as fragments, which were obtained by crashing a mother alloy followed by arc melting. The bulk specimens exhibit an amorphous state up to 6mm for Nd₆₀Fe₃₀Al₁₀, 3mm for Nd₇₀Fe₂₀Al₁₀, 6mm for Pr₆₀Fe₃₀Al₁₀ and 1mm for Nd₇₀Fe₂₀Al₁₀. Bulk specimens with thicknesses ranging from 100μm to 6mm exhibit hard magnetism with coercive force (_iH_c) ranging from 100 to 300kA/m. The _iH_c of the bulk specimens tends to decrease with decreasing thickness. It is estimated that the soft to hard magnetic transition takes place approximately 100μm for (Nd, Pr)₇₀Fe₂₀Al₁₀ amorphous alloys. The critical cooling rate for the formation of amorphous phase is estimated as less than 100K/s for (Nd, Pr)_60-70Fe_30-20 Al₁₀ alloys from the analyses using thermodynamic quantities.

Original language	English
Pages (from-to)	1140-1144
Number of pages	5
Journal	Materials Science and Engineering A
Volume	375-377
Issue number	1-2 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.msea.2003.10.201
Publication status	Published - 2004 Jul 1

Keywords

Arc melting
Bulk amorphous alloy
Critical cooling rate
Magnetic properties
Nd-Fe-Al alloy
Pr-Fe-Al alloy

ASJC Scopus subject areas

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

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title = "Size dependence of soft to hard magnetic transition in (Nd, Pr)-fe-al bulk amorphous alloys",

abstract = "Magnetic properties of (Nd, Pr)60-70Fe30-20Al10 amorphous alloys were studied for bulk specimens prepared by arc-melting. The bulk specimens with thicknesses ranging from 100μm to 6mm were prepared as fragments, which were obtained by crashing a mother alloy followed by arc melting. The bulk specimens exhibit an amorphous state up to 6mm for Nd60Fe30Al10, 3mm for Nd70Fe20Al10, 6mm for Pr60Fe30Al10 and 1mm for Nd70Fe20Al10. Bulk specimens with thicknesses ranging from 100μm to 6mm exhibit hard magnetism with coercive force (iHc) ranging from 100 to 300kA/m. The iHc of the bulk specimens tends to decrease with decreasing thickness. It is estimated that the soft to hard magnetic transition takes place approximately 100μm for (Nd, Pr)70Fe20Al10 amorphous alloys. The critical cooling rate for the formation of amorphous phase is estimated as less than 100K/s for (Nd, Pr)60-70Fe30-20 Al10 alloys from the analyses using thermodynamic quantities.",

keywords = "Arc melting, Bulk amorphous alloy, Critical cooling rate, Magnetic properties, Nd-Fe-Al alloy, Pr-Fe-Al alloy",

author = "Akira Takeuchi and Akihisa Inoue",

year = "2004",

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doi = "10.1016/j.msea.2003.10.201",

language = "English",

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AU - Takeuchi, Akira

AU - Inoue, Akihisa

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N2 - Magnetic properties of (Nd, Pr)60-70Fe30-20Al10 amorphous alloys were studied for bulk specimens prepared by arc-melting. The bulk specimens with thicknesses ranging from 100μm to 6mm were prepared as fragments, which were obtained by crashing a mother alloy followed by arc melting. The bulk specimens exhibit an amorphous state up to 6mm for Nd60Fe30Al10, 3mm for Nd70Fe20Al10, 6mm for Pr60Fe30Al10 and 1mm for Nd70Fe20Al10. Bulk specimens with thicknesses ranging from 100μm to 6mm exhibit hard magnetism with coercive force (iHc) ranging from 100 to 300kA/m. The iHc of the bulk specimens tends to decrease with decreasing thickness. It is estimated that the soft to hard magnetic transition takes place approximately 100μm for (Nd, Pr)70Fe20Al10 amorphous alloys. The critical cooling rate for the formation of amorphous phase is estimated as less than 100K/s for (Nd, Pr)60-70Fe30-20 Al10 alloys from the analyses using thermodynamic quantities.

AB - Magnetic properties of (Nd, Pr)60-70Fe30-20Al10 amorphous alloys were studied for bulk specimens prepared by arc-melting. The bulk specimens with thicknesses ranging from 100μm to 6mm were prepared as fragments, which were obtained by crashing a mother alloy followed by arc melting. The bulk specimens exhibit an amorphous state up to 6mm for Nd60Fe30Al10, 3mm for Nd70Fe20Al10, 6mm for Pr60Fe30Al10 and 1mm for Nd70Fe20Al10. Bulk specimens with thicknesses ranging from 100μm to 6mm exhibit hard magnetism with coercive force (iHc) ranging from 100 to 300kA/m. The iHc of the bulk specimens tends to decrease with decreasing thickness. It is estimated that the soft to hard magnetic transition takes place approximately 100μm for (Nd, Pr)70Fe20Al10 amorphous alloys. The critical cooling rate for the formation of amorphous phase is estimated as less than 100K/s for (Nd, Pr)60-70Fe30-20 Al10 alloys from the analyses using thermodynamic quantities.

KW - Arc melting

KW - Bulk amorphous alloy

KW - Critical cooling rate

KW - Magnetic properties

KW - Nd-Fe-Al alloy

KW - Pr-Fe-Al alloy

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