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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Ferromagnetic order in diamond-like carbon films by Co implantation
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Ferromagnetic order in diamond-like carbon films by Co implantation

机译：钴离子注入类金刚石碳膜中的铁磁有序

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摘要

We report the observation of ferromagnetic order in diamond-like carbon (DLC) films made by mass selective ion beam deposition and after low energy implantation with Co ions. Different Co fluences were studied with a peak concentration of up to 25% at an average Co implantation depth of 30 nm. The saturation moment per Co atom (0.2-0.3 mu(B)) was found to be strongly dependent on temperature and it was significantly lower than that reported in bulk cobalt or cobalt nanoparticles (1.67 mu(B) per Co atom). The observed magnetic moment cannot be attributed to ferromagnetic nanoparticles as no evidence for superparamagnetism was detected. The magnetic order observed may be due to Co bonding in DLC possibly leading to dilute ferromagnetic semiconductor behaviour with an inhomogeneous distribution of cobalt atoms. Raman spectroscopy measurements showed that Co implantation resulted in an increase in the sp(2) clustering with increasing Co fluence. Thus, our results show that Co implantation into DLC films increases the graphitic properties of the film and leads to magnetic order at room temperature.
机译：我们报告了通过质量选择性离子束沉积和低能量注入Co离子制成的类金刚石碳（DLC）膜中的铁磁有序观察。研究了不同的Co注入量，在30 nm的平均Co注入深度下，峰浓度高达25％。发现每个Co原子的饱和矩（0.2-0.3 mu（B））强烈依赖于温度，并且显着低于散装钴或钴纳米颗粒中报告的饱和矩（每个Co原子1.67 mu（B））。观察到的磁矩不能归因于铁磁纳米颗粒，因为没有检测到超顺磁性的证据。观察到的磁阶可能是由于DLC中的Co键所致，可能导致钴原子分布不均匀的稀铁磁半导体行为。拉曼光谱测量结果表明，Co注入导致Co注入量增加，sp（2）团簇增加。因此，我们的结果表明，向DLC膜中注入Co可以提高膜的石墨性质，并在室温下导致磁序。

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