期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 518, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2020.167414
关键词
??-Fe < sub > 16 <; sub > N < sub > 2 <; sub >; Permanent magnets; Nanocomposite magnets; Hard ferrites; Iron nitrides
资金
- German Science Foundation [DFG YI 165/1-1, DFG XU 121/7-1]
- German federal state of Hessen through its excellence programme LOEWE RESPONSE
- 15th Thousand Youth Talents Program of China
- NSFC [11902150]
- BMBF [03X3582]
- Lichtenberg High Performance Computer of TU Darmstadt
In the study of hard-soft composite magnets, a mixture of iron nitride and Sr-hexaferrite is investigated. Increasing the iron nitride fraction enhances saturation magnetization but decreases coercivity, while the microstructural features such as porosity and oxidation of iron nitride phase affect the magnetic properties.
In the quest for hard-soft composite magnets, we present here the interesting case of mixing iron nitride and Srhexaferrite, where the uniaxial anisotropy of the ?soft? phase is larger than that of the hard phase. We have synthesized bulk hard-soft composite magnets from Al-doped Sr-hexaferrite SrAl2Fe10O19 sub-micron- and iron nitride ??-Fe16N2 nano-particles. Both powders have been mixed via ball milling, followed by compaction at low temperatures. The resultant microstructure and magnetic properties are investigated. Higher iron nitride fraction results in increased saturation magnetization, but lower coercivity. Remanence can be slightly enhanced, from 22.4 A?m2/kg in the initial ferrite powder to 26.4 A?m2/kg for 15 wt% ??-Fe16N2. However, the squareness is deteriorated significantly. Microstructural investigations reveal low density, high porosity and partial oxidation of the ??-Fe16N2 phase which are the reasons for the poor coupling. Micromagnetic modelling is used to unravel the decisive role of different microstructural features on the coercivity and energy product of the composites.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据