期刊
JOURNAL OF ADVANCED CERAMICS
卷 12, 期 4, 页码 815-821出版社
TSINGHUA UNIV PRESS
DOI: 10.26599/JAC.2023.9220722
关键词
SrFe12O19 (SrM) ferrite; hydrothermal method; anisotropic exchange coupling interaction; Henkel plot
Anisotropic exchange coupling interaction was observed in sintered oblate cylindrical SrFe12O19 specimens synthesized via a hydrothermal method. The exchange coupling interaction occurred between hard-hard magnetic grains in both as-pressed and sintered samples. However, this interaction was only found in the in-plane direction and not in the out-of-plane direction for the sintered specimens. The anisotropy was attributed to the vertically arranged plate-like SrM grains with micrometer width and nanometer thickness, as confirmed by cross-sectional morphologies of fractured specimens.
Exchange coupling interaction in sintered magnetic materials is generally isotropic. In this study, the anisotropic exchange coupling interaction was found in sintered oblate cylindrical SrFe12O19 (SrM) specimens obtained by the SrM nanopowders synthesized via a hydrothermal method. According to Henkel plots, the exchange coupling interaction between hard-hard magnetic grains was found in both as-pressed and sintered specimens. However, the exchange coupling interaction can only be found in the in-plane direction but not in the out-of-plane direction for the sintered specimens. By building a model of a grain configuration, this anisotropy of the exchange coupling interaction was ascribed to the vertically arranged plate-like SrM grains with micrometers in width but nanometers in thickness, which was confirmed by morphologies of cross sections in fractured specimens.
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