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

Department of Physics

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

3 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	1139-1144
Number of pages	6
Journal	Journal of Magnetism and Magnetic Materials
Volume	401
DOIs	https://doi.org/10.1016/j.jmmm.2015.11.035
State	Published - 1 Mar 2016

Keywords

Co-Hf-based nanocomposites
Rare-earth-free permanent magnetic materials

Access to Document

10.1016/j.jmmm.2015.11.035

Cite this

@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",

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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

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U2 - 10.1016/j.jmmm.2015.11.035

DO - 10.1016/j.jmmm.2015.11.035

M3 - 期刊論文

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VL - 401

SP - 1139

EP - 1144

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials