纳米BaCo_ xZn_{2-x} Fe_{16} O_{27}六角铁氧体在自旋重取向转变附近的磁性和结构表征
Magnetic and structural characterization of nanosized BaCo_xZn_{2-x}Fe_{16}O_{27} hexaferrite in the vicinity of spin reorientation transition
摘要：
六方晶系铁氧体的许多应用与其易轴或易面磁晶各向异性结构有关。某些W型铁氧体在磁场或温度变化下在不同各向异性状态之间经历自旋重取向转变（SRT）。通过改变六角铁氧体的化学组成可以调节相变点，这表明六角铁氧体在室温磁制冷中具有潜在的应用前景。本文报道了BaCo_ xZn_{2-x} Fe_{16} O_{27}（0.7 \leq x \leq 2）掺杂钡铁氧体的结构和磁性表征结果。采用溶胶-凝胶柠檬酸盐前驱体法制备超细粉体。通过X射线衍射和透射电子显微镜检查晶体结构和粒度分布。已确定的最佳合成温度，确保完全形成单一的W相，有限的晶粒生长。热磁分析和交流磁化率测量揭示了自旋重取向转变。
英文摘要：
Numerous applications of hexagonal ferrites are related to their easy axis or easy plane magnetocrystalline anisotropy configurations. Certain W-type ferrites undergo spin reorientation transitions (SRT) between different anisotropy states on magnetic field or temperature variation. The transition point can be tuned by modifying the chemical composition, which suggests a potential application of hexaferrites in room temperature magnetic refrigeration. Here we present the results of structural and magnetic characterization of BaCo_xZn_{2-x}Fe_{16}O_{27} (0.7 \leq x \leq 2) doped barium ferrites. Fine powders were prepared using a sol-gel citrate precursor method. Crystal structures and particle size distributions were examined by X-ray diffraction and transmission electron microscopy. The optimal synthesis temperature ensuring complete formation of single W-phase with limited grain growth has been determined. Spin reorientation transitions were revealed by thermomagnetic analysis and AC susceptibility measurements.
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