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我们在真空离子束溅射设备中制备了Co SiO2 颗粒膜 .其结构和磁性分别利用透射电子显微术 (TEM)和铁磁共振 (FMR)来研究 .TEM分析表明Co纳米颗粒相互独立地分布在SiO2介质中 ,且尺寸分布非常窄 .室温转角FMR实验显示薄膜具有单轴各向异性 .变温FMR实验被用来研究在 10 0～ 30 0K温度范围内的颗粒间相互作用强度随温度变化的关系 (我们利用一理论模型计算了颗粒集合体中的铁磁部分所占比例和超顺磁部分所占比例 ) .我们发现颗粒间相互作用强度除了与温度有关之外 ,还与Co颗粒的尺寸直接相关
We prepared a Co SiO2 particle film in a vacuum ion beam sputtering apparatus, the structure and magnetism of which were studied by transmission electron microscopy (TEM) and ferro-magnetic resonance (FMR), respectively. TEM analysis showed that the Co nanoparticles were distributed independently of one another In the SiO2 media, and the size distribution is very narrow.From room temperature FMR experiments showed that the film has a uniaxial anisotropy.Fringent temperature FMR experiment was used to study the temperature range of 10 0 ~ 30 0K Interaction between particles with temperature changes (We used a theoretical model to calculate the proportion of the ferromagnetic portion and the fraction of the superparamagnetic portion in the particle assembly.) In addition to the temperature dependence, we found that the particle size D