TY - JOUR
T1 - Alignment and angular dependences of coercivity for (Sm,Ce)2(Co,Fe,Cu,Zr)17 magnets
AU - Matsuura, Yutaka
AU - Tamura, Ryuji
AU - Ishigami, Keisuke
AU - Sumitani, Kazushi
AU - Kajiwara, Kentaro
AU - Nakamura, Tetsuya
N1 - Funding Information:
This work was supported by the Japan Science and Technology Agency (JST), in part by the Collaborative Research Based on Industrial Demand under Grant JPMJSK 1617, and in part by the Japan Society for the Promotion of Sciences (JSPS) Grant-Aid for Scientific Research (KAKENHI) under Grant 17K06781. We thank Shin-Etsu Chemical Co., Ltd. for providing magnet samples.
Publisher Copyright:
© 2021 The Japan Institute of Metals and Materials
PY - 2021
Y1 - 2021
N2 - The alignment and angular dependences of the coercivity of (Sm, Ce)2(Co, Fe, Cu, Zr)17 magnets were investigated. The coercivity of an aligned magnet is slightly larger than that of the isotropically aligned magnet. This result differs from those of Nd-Fe-B sintered magnets and ferrite magnets. In regard to the angular dependence, the coercivity of (Sm, Ce)2(Co, Fe, Cu, Zr)17 magnets decreases from 0° to 40° and increases thereafter. The trend is similar to that observed in Ga-doped Nd-Fe-B sintered magnets and ferrite magnets and reproduces those expected from a Stoner-Wohlfarth model or a coherent rotation of magnetization, even though the magnetization reversals for these magnets proceed through the motion of magnetic domain walls. The angular dependence of the coercivity of isotropically aligned magnets agrees well with the calculation results for angles up to 50° obtained under the assumption that the magnetization of every grain reverses independently through the motion of magnetic domain walls. These results support strongly the conclusion that the coercivity of Ga-doped Nd-Fe-B sintered magnets and ferrite magnets, both which have an angular dependence similar to (Sm, Ce)2(Co, Fe, Cu, Zr)17 magnets, is determined by the motion of magnetic domain walls.
AB - The alignment and angular dependences of the coercivity of (Sm, Ce)2(Co, Fe, Cu, Zr)17 magnets were investigated. The coercivity of an aligned magnet is slightly larger than that of the isotropically aligned magnet. This result differs from those of Nd-Fe-B sintered magnets and ferrite magnets. In regard to the angular dependence, the coercivity of (Sm, Ce)2(Co, Fe, Cu, Zr)17 magnets decreases from 0° to 40° and increases thereafter. The trend is similar to that observed in Ga-doped Nd-Fe-B sintered magnets and ferrite magnets and reproduces those expected from a Stoner-Wohlfarth model or a coherent rotation of magnetization, even though the magnetization reversals for these magnets proceed through the motion of magnetic domain walls. The angular dependence of the coercivity of isotropically aligned magnets agrees well with the calculation results for angles up to 50° obtained under the assumption that the magnetization of every grain reverses independently through the motion of magnetic domain walls. These results support strongly the conclusion that the coercivity of Ga-doped Nd-Fe-B sintered magnets and ferrite magnets, both which have an angular dependence similar to (Sm, Ce)2(Co, Fe, Cu, Zr)17 magnets, is determined by the motion of magnetic domain walls.
KW - Coercivity
KW - Coercivity mechanism
KW - Magnet
KW - Permanent magnet
KW - SmCo magnet
KW - SmCo magnet
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U2 - 10.2320/matertrans.MT-M2020402
DO - 10.2320/matertrans.MT-M2020402
M3 - Article
AN - SCOPUS:85108895038
SN - 1345-9678
VL - 62
SP - 1009
EP - 1012
JO - Materials Transactions
JF - Materials Transactions
IS - 7
ER -