Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, 730000, Lanzhou, People's Republic of China.
Nanoscale Res Lett. 2010 Feb 16;5(4):769-72. doi: 10.1007/s11671-010-9555-8.
Room temperature ferromagnetism (RTF) is observed in pure copper oxide (CuO) nanoparticles which were prepared by precipitation method with the post-annealing in air without any ferromagnetic dopant. X-ray photoelectron spectroscopy (XPS) result indicates that the mixture valence states of Cu1+ and Cu2+ ions exist at the surface of the particles. Vacuum annealing enhances the ferromagnetism (FM) of CuO nanoparticles, while oxygen atmosphere annealing reduces it. The origin of FM is suggested to the oxygen vacancies at the surface/or interface of the particles. Such a ferromagnet without the presence of any transition metal could be a very good option for a class of spintronics.
室温铁磁性（RTF）在通过沉淀法制备的、未经任何铁磁掺杂的、经空气后处理退火的纯氧化铜（CuO）纳米粒子中被观察到。X 射线光电子能谱（XPS）结果表明，在粒子表面存在 Cu1+和 Cu2+离子的混合价态。真空退火增强了 CuO 纳米粒子的铁磁性（FM），而氧气气氛退火则降低了它。FM 的起源被认为是来自于粒子表面/界面的氧空位。这种没有任何过渡金属存在的铁磁体可能是一类自旋电子学的绝佳选择。
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