Effect of Co addition on the magnetic properties of nanocrystalline Fe-rich Fe-Nb-(Nd,Pr)-B alloys produced by crystallization of an amorphous phase

Akinori Kojima; Akihiro Makino; Akihisa Inoue

doi:10.1016/S1359-6462(01)00711-4

Effect of Co addition on the magnetic properties of nanocrystalline Fe-rich Fe-Nb-(Nd,Pr)-B alloys produced by crystallization of an amorphous phase

Akinori Kojima, Akihiro Makino, Akihisa Inoue

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

14 Citations (Scopus)

Abstract

The effect of Co addition on the magnetic properties and microstructure for the nanocrystalline Fe_93-xNb₂(Nd,Pr)₂B₂ (x = 5-7) alloys produced by crystallization of an amorphous phase has been investigated. The melt-spun Fe_93-x-yCo_xNb₂(Nd,Pr)_y B₅ (x = 0-20 and y = 5-7 at.%) ribbons form a nanocomposite structure of bcc-(Fe,Co) and Pr₂(Fe,Co)₁₄B with grain sizes of 10-50 nm after annealing at 973-1023 K, showing a smooth J-H curve typical for the exchange-spring magnet. The alloys containing Co show a high energy product ((BH)_max) upon annealing at a relatively low temperature presumably because the precipitation temperature of each phase decreases by addition of CO. The (BH)_max values after annealing at an optimum temperature are improved by addition of 5-20 at.% Co for the Fe_86-xCo_xNb₂(Nd,Pr)₇B₅ and Fe_88-xCo_xNb₂Nd₅B₅ alloys. The improvement of (BH)_max by Co addition is attributed to the enhancement of J_r, presumably resulting from the increase in magnetization of each phase and the exchange-coupled region between the soft and hard magnetic phases.

Original language	English
Pages (from-to)	1383-1387
Number of pages	5
Journal	Scripta Materialia
Volume	44
Issue number	8-9
DOIs	https://doi.org/10.1016/S1359-6462(01)00711-4
Publication status	Published - 2001 May 18
Externally published	Yes

Keywords

Amorphous
Crystallization
Magnetic properties
Nanocomposite magnet
Remanence enhancement

ASJC Scopus subject areas

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

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10.1016/S1359-6462(01)00711-4

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title = "Effect of Co addition on the magnetic properties of nanocrystalline Fe-rich Fe-Nb-(Nd,Pr)-B alloys produced by crystallization of an amorphous phase",

abstract = "The effect of Co addition on the magnetic properties and microstructure for the nanocrystalline Fe93-xNb2(Nd,Pr)2B2 (x = 5-7) alloys produced by crystallization of an amorphous phase has been investigated. The melt-spun Fe93-x-yCoxNb2(Nd,Pr)y B5 (x = 0-20 and y = 5-7 at.%) ribbons form a nanocomposite structure of bcc-(Fe,Co) and Pr2(Fe,Co)14B with grain sizes of 10-50 nm after annealing at 973-1023 K, showing a smooth J-H curve typical for the exchange-spring magnet. The alloys containing Co show a high energy product ((BH)max) upon annealing at a relatively low temperature presumably because the precipitation temperature of each phase decreases by addition of CO. The (BH)max values after annealing at an optimum temperature are improved by addition of 5-20 at.% Co for the Fe86-xCoxNb2(Nd,Pr)7B5 and Fe88-xCoxNb2Nd5B5 alloys. The improvement of (BH)max by Co addition is attributed to the enhancement of Jr, presumably resulting from the increase in magnetization of each phase and the exchange-coupled region between the soft and hard magnetic phases.",

keywords = "Amorphous, Crystallization, Magnetic properties, Nanocomposite magnet, Remanence enhancement",

author = "Akinori Kojima and Akihiro Makino and Akihisa Inoue",

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doi = "10.1016/S1359-6462(01)00711-4",

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T1 - Effect of Co addition on the magnetic properties of nanocrystalline Fe-rich Fe-Nb-(Nd,Pr)-B alloys produced by crystallization of an amorphous phase

AU - Kojima, Akinori

AU - Makino, Akihiro

AU - Inoue, Akihisa

PY - 2001/5/18

Y1 - 2001/5/18

N2 - The effect of Co addition on the magnetic properties and microstructure for the nanocrystalline Fe93-xNb2(Nd,Pr)2B2 (x = 5-7) alloys produced by crystallization of an amorphous phase has been investigated. The melt-spun Fe93-x-yCoxNb2(Nd,Pr)y B5 (x = 0-20 and y = 5-7 at.%) ribbons form a nanocomposite structure of bcc-(Fe,Co) and Pr2(Fe,Co)14B with grain sizes of 10-50 nm after annealing at 973-1023 K, showing a smooth J-H curve typical for the exchange-spring magnet. The alloys containing Co show a high energy product ((BH)max) upon annealing at a relatively low temperature presumably because the precipitation temperature of each phase decreases by addition of CO. The (BH)max values after annealing at an optimum temperature are improved by addition of 5-20 at.% Co for the Fe86-xCoxNb2(Nd,Pr)7B5 and Fe88-xCoxNb2Nd5B5 alloys. The improvement of (BH)max by Co addition is attributed to the enhancement of Jr, presumably resulting from the increase in magnetization of each phase and the exchange-coupled region between the soft and hard magnetic phases.

AB - The effect of Co addition on the magnetic properties and microstructure for the nanocrystalline Fe93-xNb2(Nd,Pr)2B2 (x = 5-7) alloys produced by crystallization of an amorphous phase has been investigated. The melt-spun Fe93-x-yCoxNb2(Nd,Pr)y B5 (x = 0-20 and y = 5-7 at.%) ribbons form a nanocomposite structure of bcc-(Fe,Co) and Pr2(Fe,Co)14B with grain sizes of 10-50 nm after annealing at 973-1023 K, showing a smooth J-H curve typical for the exchange-spring magnet. The alloys containing Co show a high energy product ((BH)max) upon annealing at a relatively low temperature presumably because the precipitation temperature of each phase decreases by addition of CO. The (BH)max values after annealing at an optimum temperature are improved by addition of 5-20 at.% Co for the Fe86-xCoxNb2(Nd,Pr)7B5 and Fe88-xCoxNb2Nd5B5 alloys. The improvement of (BH)max by Co addition is attributed to the enhancement of Jr, presumably resulting from the increase in magnetization of each phase and the exchange-coupled region between the soft and hard magnetic phases.

KW - Amorphous

KW - Crystallization

KW - Magnetic properties

KW - Nanocomposite magnet

KW - Remanence enhancement

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ER -

Effect of Co addition on the magnetic properties of nanocrystalline Fe-rich Fe-Nb-(Nd,Pr)-B alloys produced by crystallization of an amorphous phase

Abstract

Keywords

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