Nano Express

Nanoscale Research Letters

, Volume 5, Issue 4, pp 769-772

Open Access This content is freely available online to anyone, anywhere at any time.

Vacancy-Mediated Magnetism in Pure Copper Oxide Nanoparticles

  • Daqiang GaoAffiliated withKey Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University
  • , Jing ZhangAffiliated withKey Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University
  • , Jingyi ZhuAffiliated withKey Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University
  • , Jing QiAffiliated withKey Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University
  • , Zhaohui ZhangAffiliated withKey Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University
  • , Wenbo SuiAffiliated withKey Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University
  • , Huigang ShiAffiliated withKey Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University
  • , Desheng XueAffiliated withKey Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University Email author 

Abstract

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.

Keywords

CuO Nanoparticles X-ray photoelectron spectroscopy Room temperature ferromagnetism