垂直生长于锌基底的Co掺杂ZnO纳米棒阵列显著室温铁磁性能

Remarkable Magnetic Properties of Co-doped ZnO Nanorods array at Room Temperature originated from vertical growth on Zn foil

摘要:

通过简单的水热合成法在锌片基底上一步制备了Co掺杂的ZnO纳米棒阵列。纳米棒在基底上均匀分布，取向一致，垂直于基底大面积生长。样品结构均为六方纤锌矿结构，具有高结晶质量，不含其它杂相。随着Co掺杂浓度的增加，紫外发射峰强度逐渐下降，近带隙发射峰的半峰宽也较纯ZnO变宽。拉曼光谱显示Co的掺杂使纳米棒出现了氧空位和锌填隙本征缺陷。随着Co浓度的增加这些缺陷也随之增加。掺杂纳米棒阵列的磁滞回线表明样品具有明显的铁磁特征，并有较大的矫顽力Hc~660 Oe。这种ZnO基稀磁半导体纳米棒阵列是一种在自旋电子器件中具有应用潜力的纳米材料。

Abstract:

Large-area arrays of highly oriented Co-doped ZnO nanorods with hexagonal structure were grown on Zn substrates by single-step hydrothermal process. Structure analysis indicated that the as-prepared products were wurtzite structure, and no other secondary phase was found in the nanorods. The intensity of UV emission peak decreased with the Co doping concentrations increasing. When Co was doped into ZnO lattice, oxygen vacancies and Zn interstitials were created. The concentration of these defects increased with rise of the Co concentration. Magnetic measurement revealed that the Co doped ZnO nanorod arrays exhibited obvious room-temperature ferromagnetic behavior with a large coercive field Hc~660 Oe, which makes them potentially useful as building components for spintronics.