Magnetic and Impedance Properties of Nanocomposite CoFe2O4/Co0.7Fe0.3 and Single‐Phase CoFe2O4 Prepared Via a One‐Step Hydrothermal Synthesis

• DOI: 10.1111/jace.12437
• Publication Date: 2013-06-18T12:14:08Z
• Authors: Fenlian Zan; Yongqing Ma; Qian Ma; Yuanfeng Xu; Zhenxiang Dai; Ganhong Zheng; Mingzai Wu; Guang Li
• Keywords: Magnetocrystalline anisotropy; Nanocrystalline material; Saturation (graph theory)

Using a one‐step hydrothermal method and at different stirring speeds ( V s ), we have synthesized types of CoFe 2 O 4 ‐based magnetic nanocrystalline samples. With increasing , the sample changes from nanocomposite / Co 0.7 Fe 0.3 CFO CF ) to single‐phase ). The maximum magnetization, 88.9 emu/g, coercivity, 3010 Oe, were obtained when = 0. As increases, saturation magnetization M decreases, because amount soft phase decreases. A clear enhancement in remanence, r was observed, with 0.67; coercivity H c also exhibits local for 200 r/min. These trends can be explained well by interplay between dipolar interaction, magnetocrystalline anisotropy, shape anisotropy. speed influences impedance materials; related mechanism is discussed.