https://scholars.lib.ntu.edu.tw/handle/123456789/363859
標題: | CuO nanoparticles as a room temperature dilute magnetic giant dielectric material | 作者: | JENG-WEI CHEN Rao, G.N. |
關鍵字: | Coercivity; CuO nanoparticles; ferromagnetic; giant dielectric permittivity | 公開日期: | 2011 | 卷: | 47 | 期: | 10 | 起(迄)頁: | 3772-3775 | 來源出版物: | IEEE Transactions on Magnetics | 摘要: | 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. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-80053559379&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/363859 |
ISSN: | 00189464 | DOI: | 10.1109/TMAG.2011.2149505 | SDG/關鍵字: | 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 |
顯示於: | 物理學系 |
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