Magnetic properties improvement of melt spun Co86.5Hf11.5B2 nanocomposites by refractory elements substitution

H. W. Chang; Y. H. Lin; C. W. Shih; M. C. Liao; Y. I. Lee; W. C. Chang; C. C. Yang; C. C. Shaw

doi:10.1016/j.jmmm.2015.11.035

Magnetic properties improvement of melt spun Co_86.5Hf_11.5B₂ nanocomposites by refractory elements substitution

H. W. Chang, Y. H. Lin, C. W. Shih, M. C. Liao, Y. I. Lee, W. C. Chang, C. C. Yang, C. C. Shaw

物理學系

研究成果: 雜誌貢獻 › 期刊論文 › 同行評審

3 引文斯高帕斯（Scopus）

摘要

Magnetic properties of melt spun Co_86.5Hf_10.5MB₂ ribbons with refractory elements substitution (M=Cr, Nb, Ti, Zr) have been studied. For ternary Co_86.5Hf_11.5B₂ ribbon, permanent magnetic properties of B_r=0.71 T, _iH_c=192 kA/m, and (BH)_max=34.4 kJ/m³ are obtained, and they are significantly improved to B_r=0.73-0.76 T, _iH_c=136-216 kA/m and (BH)_max=38.4-52.8 kJ/m³ with M substitution. Summarized with the results of x-ray diffraction refinement, thermal magnetic analysis, and transmission electron microscopy, the Co_86.5Hf_10.5MB₂ nanocomposites following the optimal crystallization treatment mainly consist of orthorhombic 7:1 and face-center-cubic Co phases. Fine microstructure with average grain size in the range of 12.5-19.6 nm promotes exchange coupling effect between magnetic grains, thus improving permanent magnetic properties. The magnetic field dependence of coercivity reveals that coercivity of the studied Co_86.5Hf_10.5MB₂ nonocomposites is mainly governed by the reverse domain nucleation mechanism.

原文	???core.languages.en_GB???
頁（從 - 到）	1139-1144
頁數	6
期刊	Journal of Magnetism and Magnetic Materials
卷	401
DOIs	https://doi.org/10.1016/j.jmmm.2015.11.035
出版狀態	已出版 - 1 3月 2016

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10.1016/j.jmmm.2015.11.035

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@article{751b8a06f1154f47b3acda3fe29b7463,

title = "Magnetic properties improvement of melt spun Co86.5Hf11.5B2 nanocomposites by refractory elements substitution",

abstract = "Magnetic properties of melt spun Co86.5Hf10.5MB2 ribbons with refractory elements substitution (M=Cr, Nb, Ti, Zr) have been studied. For ternary Co86.5Hf11.5B2 ribbon, permanent magnetic properties of Br=0.71 T, iHc=192 kA/m, and (BH)max=34.4 kJ/m3 are obtained, and they are significantly improved to Br=0.73-0.76 T, iHc=136-216 kA/m and (BH)max=38.4-52.8 kJ/m3 with M substitution. Summarized with the results of x-ray diffraction refinement, thermal magnetic analysis, and transmission electron microscopy, the Co86.5Hf10.5MB2 nanocomposites following the optimal crystallization treatment mainly consist of orthorhombic 7:1 and face-center-cubic Co phases. Fine microstructure with average grain size in the range of 12.5-19.6 nm promotes exchange coupling effect between magnetic grains, thus improving permanent magnetic properties. The magnetic field dependence of coercivity reveals that coercivity of the studied Co86.5Hf10.5MB2 nonocomposites is mainly governed by the reverse domain nucleation mechanism.",

keywords = "Co-Hf-based nanocomposites, Rare-earth-free permanent magnetic materials",

author = "Chang, {H. W.} and Lin, {Y. H.} and Shih, {C. W.} and Liao, {M. C.} and Lee, {Y. I.} and Chang, {W. C.} and Yang, {C. C.} and Shaw, {C. C.}",

note = "Publisher Copyright: {\textcopyright} 2015 Published by Elsevier B.V.",

year = "2016",

month = mar,

day = "1",

doi = "10.1016/j.jmmm.2015.11.035",

language = "???core.languages.en_GB???",

volume = "401",

pages = "1139--1144",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

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TY - JOUR

T1 - Magnetic properties improvement of melt spun Co86.5Hf11.5B2 nanocomposites by refractory elements substitution

AU - Chang, H. W.

AU - Lin, Y. H.

AU - Shih, C. W.

AU - Liao, M. C.

AU - Lee, Y. I.

AU - Chang, W. C.

AU - Yang, C. C.

AU - Shaw, C. C.

PY - 2016/3/1

Y1 - 2016/3/1

N2 - Magnetic properties of melt spun Co86.5Hf10.5MB2 ribbons with refractory elements substitution (M=Cr, Nb, Ti, Zr) have been studied. For ternary Co86.5Hf11.5B2 ribbon, permanent magnetic properties of Br=0.71 T, iHc=192 kA/m, and (BH)max=34.4 kJ/m3 are obtained, and they are significantly improved to Br=0.73-0.76 T, iHc=136-216 kA/m and (BH)max=38.4-52.8 kJ/m3 with M substitution. Summarized with the results of x-ray diffraction refinement, thermal magnetic analysis, and transmission electron microscopy, the Co86.5Hf10.5MB2 nanocomposites following the optimal crystallization treatment mainly consist of orthorhombic 7:1 and face-center-cubic Co phases. Fine microstructure with average grain size in the range of 12.5-19.6 nm promotes exchange coupling effect between magnetic grains, thus improving permanent magnetic properties. The magnetic field dependence of coercivity reveals that coercivity of the studied Co86.5Hf10.5MB2 nonocomposites is mainly governed by the reverse domain nucleation mechanism.

AB - Magnetic properties of melt spun Co86.5Hf10.5MB2 ribbons with refractory elements substitution (M=Cr, Nb, Ti, Zr) have been studied. For ternary Co86.5Hf11.5B2 ribbon, permanent magnetic properties of Br=0.71 T, iHc=192 kA/m, and (BH)max=34.4 kJ/m3 are obtained, and they are significantly improved to Br=0.73-0.76 T, iHc=136-216 kA/m and (BH)max=38.4-52.8 kJ/m3 with M substitution. Summarized with the results of x-ray diffraction refinement, thermal magnetic analysis, and transmission electron microscopy, the Co86.5Hf10.5MB2 nanocomposites following the optimal crystallization treatment mainly consist of orthorhombic 7:1 and face-center-cubic Co phases. Fine microstructure with average grain size in the range of 12.5-19.6 nm promotes exchange coupling effect between magnetic grains, thus improving permanent magnetic properties. The magnetic field dependence of coercivity reveals that coercivity of the studied Co86.5Hf10.5MB2 nonocomposites is mainly governed by the reverse domain nucleation mechanism.

KW - Co-Hf-based nanocomposites

KW - Rare-earth-free permanent magnetic materials

UR - http://www.scopus.com/inward/record.url?scp=84947125474&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2015.11.035

DO - 10.1016/j.jmmm.2015.11.035

M3 - 期刊論文

AN - SCOPUS:84947125474

SN - 0304-8853

VL - 401

SP - 1139

EP - 1144

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

Magnetic properties improvement of melt spun Co86.5Hf11.5B2 nanocomposites by refractory elements substitution

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Magnetic properties improvement of melt spun Co_86.5Hf_11.5B₂ nanocomposites by refractory elements substitution