JENG-WEI CHENRao, G.N.G.N.Rao2018-09-102018-09-10201100189464http://www.scopus.com/inward/record.url?eid=2-s2.0-80053559379&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/363859We report the structure, magnetic and dielectric properties of CuO nanoparticles synthesized by co-precipitation method. The magnetic measurements reveal the presence of a ferromagnetic (FM) component at room temperature with coercivity of 200 Oe and saturation magnetization of 0.004 emu/g. The observed FM may originate from different valence states of the copper ions due to the oxygen vacancies at the surface/or interface of the particles. In addition, these nanoparticles also exhibit a high dielectric permittivity (ε′∼ 104) with weak temperature dependence in a wide range of temperature. Such a room temperature FM and giant dielectric permittivity without the presence of any transition metal could be a very good option for a class of spintronics. © 2011 IEEE.Coercivity; CuO nanoparticles; ferromagnetic; giant dielectric permittivityCoercive force; Copper oxides; Dielectric materials; Ferromagnetic materials; Ferromagnetism; Frequency modulation; Interface states; Metal ions; Nanoparticles; Permittivity; Precipitation (chemical); Saturation magnetization; Synthesis (chemical); Temperature distribution; Transition metals; Coprecipitation method; CuO nanoparticles; ferromagnetic; Giant dielectric permittivity; High dielectrics; Magnetic and dielectric properties; Temperature dependence; Valence state; Nanomagneticsjournal article10.1109/TMAG.2011.21495052-s2.0-80053559379WOS:000296418200373