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arXiv 0905.4315cond-mat.mtrl-scicond-mat.other
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氢在石墨表面室温铁磁性中的作用

The role of hydrogen in room-temperature ferromagnetism at graphite surfaces

H. Ohldag, P. Esquinazi, E. Arenholz, D. Spemann, M. Rothermel, A. Setzer, T. Butz

摘要:

我们提出了一个X射线二向色性研究石墨表面,解决了起源和无金属碳的铁磁性的大小。我们发现,除了碳$π$态,氢介导的电子态也表现出净自旋极化与显着的剩磁在室温下。所观察到的磁性仅限于辐照样品的顶部$\approx$ 10 nm,其中实际磁化强度在室温下达到$ \simeq 15$ emu/g。我们证明了在无金属的未处理的石墨中发现的铁磁性是内在的,并且与质子轰击石墨中发现的铁磁性具有相似的起源。

英文摘要:

We present a x-ray dichroism study of graphite surfaces that addresses the origin and magnitude of ferromagnetism in metal-free carbon. We find that, in addition to carbon $π$ states, also hydrogen-mediated electronic states exhibit a net spin polarization with significant magnetic remanence at room temperature. The observed magnetism is restricted to the top $\approx$10 nm of the irradiated sample where the actual magnetization reaches $ \simeq 15$ emu/g at room temperature. We prove that the ferromagnetism found in metal-free untreated graphite is intrinsic and has a similar origin as the one found in proton bombarded graphite.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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