CuO nanoparticles as a room temperature dilute magnetic giant dielectric material
Journal
IEEE Transactions on Magnetics
Journal Volume
47
Journal Issue
10
Pages
3772-3775
Date Issued
2011
Author(s)
Rao, G.N.
Abstract
We 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.
Subjects
Coercivity; CuO nanoparticles; ferromagnetic; giant dielectric permittivity
Other Subjects
Coercive 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; Nanomagnetics
Type
journal article