对添加ZnO纳米颗粒的组成和温度介导的磁性特征的洞察
S Rizwana Begum1, A G Anitha1, Arun Thirumurugan2
1Department of Physics, Seethalakshmi Ramaswami College (Autonomous) [Affiliated to Bharathidasan University], Tiruchirappalli 620002, Tamil Nadu, India.
概括
添加氧化 (ZnO) 纳米颗粒具有可调节的磁性,在低磁场表现出弱铁磁性,在高磁场表现出二磁性. 这些稀释磁性半导体可以制造出温度依赖的特性,用于各种应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 固态物理 固态物理
背景情况:
- 氧化 (ZnO) 是一种多功能半导体,在稀释磁性半导体 (DMS) 中具有潜在的应用.
- 将ZnO与等过渡金属合可以诱导磁性特性.
研究的目的:
- 调查度和温度对ZnO磁性特性的影响.
- 通过一种具有成本效益的共沉降方法,探索添加的ZnO纳米颗粒的合成.
主要方法:
- 用于结构分析的X射线衍射 (XRD).
- 里埃变换红外光谱 (FTIR) 用于识别功能组.
- 扩散反射光谱 (DRS) 用于光学带隙测定.
- 光发光 (PL) 光谱法用于分析点缺陷.
- 振动样本磁力测量 (VSM) 用于描述磁性行为.
主要成果:
- 使用高达5%重量的,并没有显著改变ZnO晶体结构.
- 随着含量增加,由于离子与ZnO的相互作用,观察到带隙缩小.
- 确定了诸如和氧气空缺等点缺陷.
- 在Cr-doped ZnO纳米颗粒显示低磁场的弱铁磁性和在300 K的高磁场的主导二磁性.
- 发现磁性特征可以调节温度.
结论:
- 兴奋剂有效地将磁性特性引入到ZnO纳米颗粒中.
- 观察到的磁性行为和可调节的特性使Cr-doped ZnO成为DMS应用的有希望的候选者.
- 共同沉方法为合成这些材料提供了一种具有成本效益的途径.
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