Single-crystal growth and magnetic properties of Co-substituted Ca-La magnetoplumbite-type ferrite
Single-crystal growth and magnetic properties of Co-substituted Ca-La magnetoplumbite-type ferrite
复制标题
共取代Ca-La磁铅石型铁氧体的单晶生长及磁性能
DOI：
10.1016/j.jssc.2018.11.036
复制
发表时间：
2019
影响因子：
3.3
通讯作者：
Nakamura H.
中科院分区：
文献类型：
--
作者：
Waki T.;Uji K.;Tabata Y.;Nakamura H.
Using the flux method, we successfully synthesized Co-substituted Ca–La magnetoplumbite-type ferrite single crystals, Ca x La y Fe z Co w O 19 (Ca–La–Co system), a base material for high-performance hard ferrite magnets. Wavelength-dispersive X-ray analysis revealed that the chemical compositions of the obtained crystals depended on both the starting composition and reaction atmosphere. The fraction of Fe+ Co to Ca+ La deviates from the canonical value of 12, and the Co content, which is essential in magnetic anisotropy, improves with the synthesis under an oxygen gas stream. In addition, the magnetic anisotropy is enhanced by the Co substitution, as expected, but also depends on the Ca/La ratio, suggesting an appreciable effect of Fe 2+. The magnetocrystalline anisotropy can be larger in the Ca–La–Co system than in the Sr–La–Co system.
