Ferromagnetic State Of Undoped And Co, Mn Doped Zno Nanoparticles

Research Article
Myroslava Omelchenko
ZnO nanoparticles; magnetization; paramagnetism; ferromagnetism; Brillouin function

For the first time room temperature ferromagnetism (RTFM) is registered and analyzed in these materials. The detail description of the measured magnetization of the material, namely pure and doped ZnO nanoparticles, obtained by microwave solvothermal synthesis, is presented from the experimental and analytical point of view. Comparing announcements of room temperature ferromagnetic state reported by many authors and own experimental results one can claim that ferromagnetic state in pure and doped ZnO exist. But there are questions with lacking answers, like the stability of the room temperature ferromagnetic state, the nature of RTFM. This paper is focused on experimental registration using SQUID and description of ferromagnetic state. The Brillouin function fitting was applied to analyze the paramagnetic contribution of transitional metal (TM) dopands in the material. The magnetization of zinc oxide nanoparticles (NPs) doped with TM ions was obtained for the samples with nominal concentration 1% and 15% Co2+ and Mn2+ +each. The most unusual magnetic properties perform co-doped NPs - Zn(1-x-y)MnxCoyO. The nominal content of Co2+ and Mn2+ in the zinc oxide co-doped NPs was x = y = 1, 5, 10 and 15 mol%.