Solvothermal synthesis of high-performance magnetic cobalt nanowires and bonded anisotropic magnets prepared thereof

In this research, we report the effects of the solvothermal synthesis including the reaction temperature (T-r), reaction time (t(r)), and hexadecylamine concentrations (HDA(c)) on the morphology and magnetic properties of Co nanowires (Co NWs). The obtained results reveal the great impact of T-r, t(r), and HDA(c) on magnetic properties of Co NWs and magnets prepared thereof. The best magnetic properties were found in the Co NWs of the aspect ratio m between the length L and diameter D, m = L/D similar to 10 synthesized at T-r = 175 degrees C, t(r) = 20 h, and HDA(c) = 0.6 mmol with the saturation magnetization (M-s) of 146 emu/g and coercivity (H-i(c)) of 4.1 kOe. These Co NWs were used for preparing bonded anisotropic magnet with the mass density rho = 5.8 g/cm(3), M-s = 6.31 kG, M-r = 5.85 kG, H-i(c) = 6.76 kOe, H-b(c) = 5.18 kOe, and energy product (BH)(max) = 7.74 MGOe.