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Micromagnetic investigation on the coercivity mechanism of the SmCo 5 ∕ Sm 2 Co 17 high-temperature magnets

The coercivity mechanism of the precipitation-hardened Sm ( Co , Fe , Cu , Zr ) z magnets at different temperature have been investigated by micromagnetic calculations. It was found that the coercivity mechanism varies with the temperature. The magnetization reversal is mainly controlled by domain-w... Full description

Journal Title: Journal of Applied Physics 15 December 2006, Vol.100(12)
Main Author: Rong, Chuan-Bing
Other Authors: Zhang, Hong-Wei , Chen, Ren-Jie , Shen, Bao-Gen , He, Shu-Li
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0021-8979 ; E-ISSN: 1089-7550 ; DOI: 10.1063/1.2399897
Link: http://dx.doi.org/10.1063/1.2399897
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recordid: aip_complete10.1063/1.2399897
title: Micromagnetic investigation on the coercivity mechanism of the SmCo 5 ∕ Sm 2 Co 17 high-temperature magnets
format: Article
creator:
  • Rong, Chuan-Bing
  • Zhang, Hong-Wei
  • Chen, Ren-Jie
  • Shen, Bao-Gen
  • He, Shu-Li
subjects:
  • Magnetism And Superconductivity
ispartof: Journal of Applied Physics, 15 December 2006, Vol.100(12)
description: The coercivity mechanism of the precipitation-hardened Sm ( Co , Fe , Cu , Zr ) z magnets at different temperature have been investigated by micromagnetic calculations. It was found that the coercivity mechanism varies with the temperature. The magnetization reversal is mainly controlled by domain-wall pinning when the temperature T is lower than 800 K, while it is dominated by coherent rotation at higher temperature. The quantitative analysis shows that the reduced coercivity is linearly related to the difference of domain-wall energy between 1:5 and 2:17 phases at T ≤ 800   K , while it is mainly determined by the ratio of exchange constant between the two phases at T > 800   K . The temperature dependence of coercivity H c ( T ) is the competitive result of the microstructure parameter α ex ( T ) and the anisotropy field. The anomalous H c ( T ) near the Curie temperature of 1:5 phase is caused by the fast drop of intergrain exchange coupling and thus the fast increase of α ex ( T ) . The micromagnetic calculations show that the anomalous H c ( T ) also can be obtained in the nanocomposite-type SmCo 5 ∕ Sm 2 Co 17 with an appropriate microstructure.
language: eng
source:
identifier: ISSN: 0021-8979 ; E-ISSN: 1089-7550 ; DOI: 10.1063/1.2399897
fulltext: fulltext
issn:
  • 0021-8979
  • 1089-7550
  • 00218979
  • 10897550
url: Link


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titleMicromagnetic investigation on the coercivity mechanism of the SmCo 5 ∕ Sm 2 Co 17 high-temperature magnets
creatorRong, Chuan-Bing ; Zhang, Hong-Wei ; Chen, Ren-Jie ; Shen, Bao-Gen ; He, Shu-Li
ispartofJournal of Applied Physics, 15 December 2006, Vol.100(12)
subjectMagnetism And Superconductivity
descriptionThe coercivity mechanism of the precipitation-hardened Sm ( Co , Fe , Cu , Zr ) z magnets at different temperature have been investigated by micromagnetic calculations. It was found that the coercivity mechanism varies with the temperature. The magnetization reversal is mainly controlled by domain-wall pinning when the temperature T is lower than 800 K, while it is dominated by coherent rotation at higher temperature. The quantitative analysis shows that the reduced coercivity is linearly related to the difference of domain-wall energy between 1:5 and 2:17 phases at T ≤ 800   K , while it is mainly determined by the ratio of exchange constant between the two phases at T > 800   K . The temperature dependence of coercivity H c ( T ) is the competitive result of the microstructure parameter α ex ( T ) and the anisotropy field. The anomalous H c ( T ) near the Curie temperature of 1:5 phase is caused by the fast drop of intergrain exchange coupling and thus the fast increase of α ex ( T ) . The micromagnetic calculations show that the anomalous H c ( T ) also can be obtained in the nanocomposite-type SmCo 5 ∕ Sm 2 Co 17 with an appropriate microstructure.
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descriptionThe coercivity mechanism of the precipitation-hardened Sm ( Co , Fe , Cu , Zr ) z magnets at different temperature have been investigated by micromagnetic calculations. It was found that the coercivity mechanism varies with the temperature. The magnetization reversal is mainly controlled by domain-wall pinning when the temperature T is lower than 800 K, while it is dominated by coherent rotation at higher temperature. The quantitative analysis shows that the reduced coercivity is linearly related to the difference of domain-wall energy between 1:5 and 2:17 phases at T ≤ 800   K , while it is mainly determined by the ratio of exchange constant between the two phases at T > 800   K . The temperature dependence of coercivity H c ( T ) is the competitive result of the microstructure parameter α ex ( T ) and the anisotropy field. The anomalous H c ( T ) near the Curie temperature of 1:5 phase is caused by the fast drop of intergrain exchange coupling and thus the fast increase of α ex ( T ) . The micromagnetic calculations show that the anomalous H c ( T ) also can be obtained in the nanocomposite-type SmCo 5 ∕ Sm 2 Co 17 with an appropriate microstructure.
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abstractThe coercivity mechanism of the precipitation-hardened Sm ( Co , Fe , Cu , Zr ) z magnets at different temperature have been investigated by micromagnetic calculations. It was found that the coercivity mechanism varies with the temperature. The magnetization reversal is mainly controlled by domain-wall pinning when the temperature T is lower than 800 K, while it is dominated by coherent rotation at higher temperature. The quantitative analysis shows that the reduced coercivity is linearly related to the difference of domain-wall energy between 1:5 and 2:17 phases at T ≤ 800   K , while it is mainly determined by the ratio of exchange constant between the two phases at T > 800   K . The temperature dependence of coercivity H c ( T ) is the competitive result of the microstructure parameter α ex ( T ) and the anisotropy field. The anomalous H c ( T ) near the Curie temperature of 1:5 phase is caused by the fast drop of intergrain exchange coupling and thus the fast increase of α ex ( T ) . The micromagnetic calculations show that the anomalous H c ( T ) also can be obtained in the nanocomposite-type SmCo 5 ∕ Sm 2 Co 17 with an appropriate microstructure.
pubAmerican Institute of Physics
doi10.1063/1.2399897
pages123913/1-123913/6
date2006-12-15