Maqola

Effect of cobalt substitution on magnetic properties of Ba4Ni2−xCoxFe36O60 hexaferrite

Xiaona JiangState Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China 1 , Chengdu 610054, ChinaSongze LiState Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China 1 , Chengdu 610054, ChinaZhong YuState Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China 1 , Chengdu 610054, ChinaVincent G. HarrisDepartment of Electrical and Computer Engineering, Northeastern University 2 , Boston, Massachusetts 02115, USAZhijuan SuDepartment of Electrical and Computer Engineering, Northeastern University 2 , Boston, Massachusetts 02115, USAKe SunState Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China 1 , Chengdu 610054, ChinaChuanjian WuState Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China 1 , Chengdu 610054, ChinaRongdi GuoState Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China 1 , Chengdu 610054, ChinaZhongwen LanState Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China 1 , Chengdu 610054, China

2018en

ABI

Annotatsiya

Co-substituted U-type hexagonal ferrite bulks, with composition of Ba4Ni2−xCoxFe36O60 (x=0.2, 0.4, 0.6, 0.8), were prepared by a conventional ceramic method. Saturation magnetization (4πMs), coercivity (Hc), and Curie temperature (Tc) were investigated. Anisotropy constant (K1) was calculated by fitting the magnetization curve (M-H) according to the law of approach to saturation, and anisotropy field (Ha) was calculated accordingly. The results reveal that all the samples possess the U-type hexagonal crystallographic structure. With increasing cobalt substitution content (x), the lattice parameters (a and c) almost remain the same owing to the similar radii of Ni2+ (0.72 Å) Co2+ (0.74 Å) ions. 4πMs goes up, while Hc Hc shows an opposite trend. K1 and Ha monotonously decrease resulting from that cobalt substitution weakens the c-axis orientation. Additionally, Tc increases from 467 °C to 484 °C.

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Identifikatorlar

DOI: 10.1063/1.5007750

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