Fattouh Farah, Rifai Lama, Habanjar Khulud, Abdallah A M, Hassan R Sayed, Yaacoub Nader, Awad Ramadan
Department of Physics, Faculty of Science, Beirut Arab University, P.O. Box 11-5020 Riad El Solh, Beirut, Lebanon.
Department of Physics, Faculty of Science, Lebanese University, Beirut, Lebanon.
J Phys Condens Matter. 2021 May 12;33(23). doi: 10.1088/1361-648X/abf478.
Hard-soft nanocomposites of (1 -) BaFeO/(ZnCo)FeO, for= 0.00, 0.25, 0.50, 0.75 and 1.00, were prepared via co-precipitation and high-speed ball milling techniques, respectively. The synthesized samples were characterized via x-ray diffraction, transmission electron microscope, Fourier transform infrared (FTIR), and vibrating sample magnetometer. XRD revealed the formation of hard-soft nanocomposites. TEM indicated that the two phases are well distributed and the particle size distribution is narrower for low content of soft phase, leading to better exchange coupling between the grains. Magnetic measurements were performed at 300 K and 77 K. The results showed a good single-phase magnetic behavior, verifying the good exchange coupling between hard and soft phases. For low (ZnCo)FeOcontent, the dipolar interactions were dominated by the exchange-coupling interactions. Additionally, the optimum values of saturation and remanent magnetizations, coercivity, and squareness ratio were obtained for= 0.5. This was attributed to the dominance of exchange-coupling interaction. The enhancement of magnetic properties and energy product ()for nanocomposites at low temperature is skilled in the reduction of the thermal fluxes of magnetic moments at the surface. The maximum energy product ()was observed in C2 at both temperatures with a smaller value than that of pure BaFeO.
分别通过共沉淀和高速球磨技术制备了（1 - ）BaFeO /（ZnCo）FeO的硬 - 软纳米复合材料，其中f值分别为0.00、0.25、0.50、0.75和1.00。通过X射线衍射、透射电子显微镜、傅里叶变换红外光谱（FTIR）和振动样品磁强计对合成的样品进行了表征。XRD显示形成了硬 - 软纳米复合材料。TEM表明，两相分布良好，软相含量低时粒径分布更窄，导致晶粒间的交换耦合更好。在300 K和77 K下进行了磁性测量。结果显示出良好的单相磁行为，证实了硬相和软相之间良好的交换耦合。对于低（ZnCo）FeO含量，偶极相互作用由交换耦合相互作用主导。此外，当f = 0.5时获得了饱和磁化强度、剩余磁化强度、矫顽力和矩形比的最佳值。这归因于交换耦合相互作用的主导地位。纳米复合材料在低温下磁性能和能量积（BH）max的增强得益于表面磁矩热通量的降低。在两个温度下，C2中均观察到最大能量积（BH）max，其值小于纯BaFeO的值。
