Abstract Observation of granular superconductivity in water doped graphite materials has motivated recent research because of the unexplored scenarios in the field of magnetism and spintronics. Diffusion of hydrogen and/or oxygen species has been reported to promote doping within graphitic grains; however, the origin and dynamics of the magnetic phenomena (i.e. superconductive ordering), which arise as a consequence of this doping-process, are still not well understood. In this work, we investigated the relationship between magnetic-ordering and hydrogen/oxygen doping in highly oriented pyrolytic graphite (HOPG). Diamagnetic lamellae exfoliated from HOPG were soaked in water and alcoholic beverages, with a variable ethanol concentration (0–60%). Superconducting quantum interference device (SQUID), electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy were employed for an in-depth characterization of undoped and doped lamellae. Presence of a hydrogen-induced ferromagnetic ordering in the π-electrons is demonstrated. To further enhance infiltration and achieve enhanced ferromagnetic signals, Isostatic-Pressure-Wine-Doping was employed. The application of pressure-induced disruption of the regular mosaic distribution within HOPG layers enhanced 1) the diffusion of the dopant within the layers and 2) the ferromagnetic response of the samples.

中文翻译：

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掺氢高取向热解石墨的铁磁相关性

摘要 由于磁性和自旋电子学领域尚未探索的情况，水掺杂石墨材料中颗粒超导性的观察激发了最近的研究。据报道，氢和/或氧物质的扩散会促进石墨颗粒内的掺杂；然而，由于这种掺杂过程而产生的磁性现象（即超导有序）的起源和动力学仍然没有得到很好的理解。在这项工作中，我们研究了高取向热解石墨 (HOPG) 中磁性排序与氢/氧掺杂之间的关系。从 HOPG 脱落的抗磁性薄片浸泡在水和酒精饮料中，乙醇浓度可变（0-60%）。超导量子干涉仪（SQUID）、电子顺磁共振（EPR）、X 射线光电子能谱 (XPS)、傅里叶变换红外光谱 (FTIR) 和拉曼光谱被用于对未掺杂和掺杂的薄片进行深入表征。证明了 π 电子中存在氢诱导的铁磁有序。为了进一步增强渗透并实现增强的铁磁信号，采用了等静压葡萄酒掺杂。HOPG 层内规则镶嵌分布的压力诱导破坏的应用增强了 1) 层内掺杂剂的扩散和 2) 样品的铁磁响应。证明了 π 电子中存在氢诱导的铁磁有序。为了进一步增强渗透并实现增强的铁磁信号，采用了等静压葡萄酒掺杂。HOPG 层内规则镶嵌分布的压力诱导破坏的应用增强了 1) 层内掺杂剂的扩散和 2) 样品的铁磁响应。证明了 π 电子中存在氢诱导的铁磁有序。为了进一步增强渗透并实现增强的铁磁信号，采用了等静压葡萄酒掺杂。HOPG 层内规则镶嵌分布的压力诱导破坏的应用增强了 1) 层内掺杂剂的扩散和 2) 样品的铁磁响应。