Magnetic softness and magnetization dynamics of FeSiBNbCu(P,Mo) nanocrystalline alloys with good high-frequency characterization

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:478

Article

Xiao, Huiyun^1,2  Dong, Yaqiang¹  He, Aina¹  Sun, Hao¹  Wang, Anding^1,3  Li, Hu¹  Liu, Lei¹  Liu, Xincai²  Li, Run-wei¹ 

[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Prov Key Lab Magnet Mat & Applicat Techn, CAS Key Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China

[2] Ningbo Univ, Sch Mat Chem, Ningbo 315201, Zhejiang, Peoples R China

[3] City Univ Hong Kong, Coll Sci & Engn, Dept Mech & Biomed Engn, Ctr Adv Struct Mat,Kowloon, Hong Kong, Peoples R China

关键词: Nanocrystalline alloy;    Magnetic softness;    Dynamic magnetization;    High-frequency;    Magnetic domain;   

DOI  :  10.1016/j.jmmm.2019.01.116

来源: Elsevier

【 摘 要 】

In this study, the microalloying effects of P and Mo on thermal behavior, magnetic softness and magnetization process of FeSiBNbCu(P,Mo) nanocrystalline alloys were investigated systematically. The P and Mo bearing alloys exhibit pronouncedly improved magnetic softness, including extremely low coercivity of about 0.7 A/m, high saturation magnetic flux density of about 1.40 T, high permeability over 3.0 x 10(4) at 1 kHz. The excellent magnetic softness could be attributed to uniform dual-phase microstructure and wide strip magnetic domains after optimum annealing. The P and Mo containing alloys also have good high-frequency characterization, especially, the permeability at 100 kHz is still over 1.53 x 10(4). These alloys also have relatively low pinning field of 20-30 A/m, which means lesser defects and easier magnetization. Through observing the changes of magnetic domains and mu with applied field increasing, we found that the increase of mu is corresponding to reversible and irreversible movement of domain walls, after reaching the maximum, the decrease of mu is related to the rotation of magnetic moment and the split of domains.

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