Both magnetization and magnetic anisotropy of CoMn_xFe_2-xO₄ particles composed of the Jahn–Teller (JT) Mn³⁺ and Co²⁺ions with an expected large magnetoelastic effect were investigated. CoMn_xFe_2-xO₄ particles were prepared by using a molten salt method with KBr as a fluxing agent. A tetragonally distorted spinel structure was confirmed for ${x} =1.3$ or higher. This suggests that an increase in Mn³⁺ions causes JT distortion of c/a >1 . However, Mn³⁺doping causes spin canting and decreased magnetization. A large saturation magnetization of $M_{s} =44$ emu/g and high coercivity of $H_{c} =4300$ Oe were observed for the sample with ${x} =1.4$ at 10 K. In addition, the magnetic anisotropy field, $H_{A}$ , and $H_{c}$ increased with the increasing ${x}$ from ${x} =1.3$ , where JT distortion was first observed.

中文翻译：

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熔盐法制备的四方钴锰铁氧体颗粒的磁性能

CoMn的磁化和磁各向异性_XFe _2-X研究了由 Jahn-Teller (JT) Mn ³⁺和 Co ²⁺离子组成的O ₄颗粒，具有预期的大磁弹性效应。钴锰_XFe _2-X以溴化钾为助熔剂，采用熔盐法制备O ₄颗粒。四方扭曲的尖晶石结构被证实为 ${x} =1.3$ 或更高。这表明 Mn ³⁺离子的增加会导致 JT 畸变c/a >1 .然而，Mn ³⁺掺杂会导致自旋倾斜和磁化强度降低。大的饱和磁化强度 $M_{s} =44$ emu/g 和高矫顽力 $H_{c} =4300$ 观察到样品的 Oe ${x} =1.4$ 在 10 K。此外，磁各向异性场， $H_{A}$ ， 和 $H_{c}$ 随着增加而增加 ${x}$ 从 ${x} =1.3$ ，首先观察到 JT 失真。