Magnetic softness, dynamic magnetization, and relaxation behavior of FeSiBC amorphous alloys
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Magnetic softness, dynamic magnetization, and relaxation behavior of FeSiBC amorphous alloys Aina He1,2 · Huiyun Xiao1 · Yaqiang Dong1,2 · Anding Wang1 · Yan Pan1 · Xiaohong Yang3 · Jianya Ge3 Received: 31 October 2019 / Accepted: 23 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The variation of dynamic coercivity, core loss, permeability (μ′), and relaxation behavior with annealing temperature, frequency as well as magnetic field magnitude (Hm) for the FeSiBC amorphous alloy was systematically studied. It can be found that the dynamic coercivity (Hcd) of 6.2 A/m at 1.0 T and 50 Hz is much larger than the static coercivity (Hcs) of 1.7 A/m for the optimally annealed F e78Si8B13C1 alloy. The increase of Hcd with the increases in frequency can be ascribed to the difficulty of domain wall motion and magnetization rotation as frequency elevates. The dynamic magnetization analysis reveals that μ′ goes up and attains a peak value as Hm increases to about 25 A/m in the low frequency range, while the μ′ does not depend on Hm in the high frequency range (f > 10 kHz). In addition, the change of magnetic relaxation time with annealing temperature and filed magnitude is discussed.
1 Introduction Fe-based amorphous alloys have superior magnetic softness consisting of the large saturation magnetic induction, large permeability, small coercivity, and small core loss due to their small magnetic anisotropies and absence of ordered atomic lattices [1, 2]. These excellent characteristics make the Fe-based amorphous alloys widely used for the transformers, inductors, electric motors, and other electrical devices [3, 4]. Since the ferromagnetic FePC [5] amorphous alloy was first discovered by Duwez et al. in 1967, a large number of Fe-based soft magnetic amorphous alloys have been developed, such as Fe(Co,Ni)SiB [6-8], Fe(Al,Ga) * Yaqiang Dong [email protected] * Anding Wang [email protected] * Jianya Ge [email protected] 1
CAS Key Laboratory of Magnetic Materials and Devices, Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Jinhua Polytechnic, Jinhua 321007, Zhejiang, China
(P,C,B,Si,Ge) [9, 10], FeCoNiCr [11], FeCoSiBNb [12], FeCrMoCB(NiP,Y) [13, 14], FeCo(Ti,Zr)B [15, 16], and Fe(Co)SiBPC [17, 18] systems. Many efforts have been made to improve amorphous forming ability by composition designing and enhance magnetic softness by annealing. In addition, other magnetic materials like magnetic nanoparticles [19] and cobalt–nickel ferrite [20] focused on improving other properties such as photo-catalytic, besides the magnetic softness. However, there are only few studies on dynamic magnetic behavior of Fe-based amorphous alloys, especially the frequency of more than 1 kHz. Nevertheless, dynamic magnetization consideration is one of the most key influe
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