氧化铜纳米粒子的非平衡行为
Unusual non-equilibrium behavior of cupric oxide nanoparticles
摘要:
我们报告的温度,磁场和时间依赖性的氧化铜纳米粒子的大小为9 nm,13 nm和16 nm的磁化强度的研究。与其他反铁磁纳米粒子系统相比,纳米粒子显示出不寻常的功能。场冷却(FC)和零场冷却(ZFC)磁化曲线分叉高于尼尔温度和通常的峰值ZFC磁化曲线是缺席。该系统没有表现出任何记忆效应,这与其他反铁磁纳米颗粒所表现出的通常行为形成鲜明对比。事实证明,CuO纳米颗粒的性质非常奇怪,既不是超顺磁性的,也不是类自旋玻璃的。
英文摘要:
We report studies on temperature, field and time dependence of magnetization on cupric oxide nanoparticles of sizes 9 nm, 13 nm and 16 nm. The nanoparticles show unusual features in comparison to other antiferromagnetic nanoparticle systems. The field cooled (FC) and zero field cooled (ZFC) magnetization curves bifurcate well above the Neel temperature and the usual peak in the ZFC magnetization curve is absent. The system does not show any memory effects which is in sharp contrast to the usual behavior shown by other antiferromagnetic nanoparticles. It turns out that the nature of CuO nanoparticles is very strange and is neither superparamagnetic nor spin glass-like .
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