Sn 和Cu掺杂对Zn0.98Fe0.02O块材样品磁性的影响

The comparative study on magnetic properties of Zn0.98Fe0.02O bulk samples with additional Cu or Sn doping

摘要:

采用共沉淀法在600oC制备了Sn 和Cu掺杂的Zn0.98Fe0.02O多晶块材样品。X射线衍射分析结果显示：所有的样品均为单相，具有ZnO纤锌矿结构。M-T曲线显示Sn掺杂严重削弱了系统铁磁性，而Cu掺杂则增强了系统铁磁性。这个结果与磁极化子模型一致，额外的Sn掺杂降低了系统中的空穴浓度，冻结了样品中的铁磁耦合作用。

Abstract:

Polycrystalline bulk samples Zn0.98Fe0.02O doped with additional Sn or Cu have been fabricated at 600oC by a coprecipitation method. The XRD structure analysis shows that all samples are of single phase with the ZnO-like wurtzite structure. X-ray photoelectron spectroscopy indicates an oxidation state of 4 for Sn，while a mixed state of 1 and 2 for Cu. It is found that Zn0.98Fe0.02O without additional doping shows weak ferromagnetism at room temperature. Cu doping has induced a light increase of magnetization in low temperature of 10 K, while Sn doping has seriously suppressed the ferromagnetism in whole temperature range. This result is consistent with bound magnetic polaron model relative to hole carriers.