The deeply buried, yet most important part of any spintronic device is the interface. This is even more interesting and much more complex when soft, light materials like organic molecules are in contact with an inorganic metallic electrode. Hence, exceptional care is required to better understand the phenomena driven by this type of organic/inorganic interfaces. To this end, ferromagnetic nuclear resonance (FNR) spectroscopy studies were performed to investigate the morphology and the magnetic properties of the hybrid organic-inorganic interfaces when zinc tetraphenyl porphyrin (ZnTPP) molecules are at the vicinity of ferromagnetic metallic cobalt (Co) layers. The FNR experimental results show that when ZnTPP is deposited on top of Co the resulting interface is smoother and sharper compared to the more extended interface obtained when Co is deposited on top of ZnTPP. The shape of the spectra suggests that no chemical bonds take place between the interfacial Co atoms and the ZnTPP molecules and that interactions at the interfaces are governed by weak van der Waals forces. Finally, FNR also showed that the magnetic anisotropy at the Co-ZnTPP hybrid interfaces is reduced compared to the magnetic anisotropy of the Co atoms inside the Co films.

中文翻译：

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铁磁核共振光谱揭示单埋钴-ZnTPP杂化界面的形貌和磁性

接口是任何自旋电子设备中根深蒂固但最重要的部分。当柔软的轻质材料（如有机分子）与无机金属电极接触时，这将变得更加有趣并且更加复杂。因此，需要格外小心才能更好地理解这种类型的有机/无机界面驱动的现象。为此，进行了铁磁核共振（FNR）光谱研究，以研究四苯基卟啉锌（ZnTPP）分子位于铁磁金属钴（Co）层附近时有机-无机杂化界面的形态和磁性。FNR实验结果表明，与将Co沉积在ZnTPP之上获得的扩展界面相比，当将ZnTPP沉积在Co之上时，所得界面更光滑，更锐利。光谱的形状表明界面Co原子与ZnTPP分子之间没有化学键发生，并且界面处的相互作用受弱范德华力支配。最后，FNR还表明，与Co膜内部Co原子的磁各向异性相比，Co-ZnTPP杂化界面的磁各向异性减小了。