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以聚苯乙烯胶体晶体为模板,通过调制溅射功率和溅射时间制备了相同厚度、不同孔间距的Co有序大孔阵列。利用扫描电子显微镜(SEM)、原子力显微镜(AFM)、X射线衍射(XRD)和振动样品磁强计(VSM)考察了样品的结构和磁学特性。发现Co有序大孔阵列的矫顽力和剩磁比最大达到175.02×10-4T和0.76,分别为Co薄膜的2.2倍和2.5倍,并且随孔间距的增大逐渐降低。结合理论分析结果表明,Co有序大孔阵列本身的形状各向异性是其取得优良磁学性能的原因,孔洞形状各向异性和薄膜本身磁晶各向异性的竞争机制是造成其磁性发生变化的物理本质。
Polystyrene colloidal crystals were used as template to prepare Co-ordered macroporous arrays with the same thickness and different pore spacing by adjusting the sputtering power and sputtering time. The structure and magnetic properties of the samples were investigated by SEM, AFM, XRD and VSM. Co coercivity and residual remanence of Co ordered macroporous arrays were found to be up to 175.02 × 10-4T and 0.76, respectively, which were 2.2 and 2.5 times that of Co films, respectively, and gradually decreased with the increase of the hole spacing. The results of theoretical analysis show that the shape anisotropy of Co-ordered macroporous arrays is the reason for their excellent magnetic properties. The competition mechanism between the anisotropy of pore shape and the magnetocrystalline anisotropy of the film itself is caused by the change of its magnetic properties The physical essence.