Author :
Chin, Tsung-Shune ; Deng, Ming-Cheng ; Hsu, Sung-Lin
Author_Institution :
Dept. of Mater. Sci. & Eng., Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
BaFe12-x-x´Mx M´x´O19 particles, with (M,M´) representing (Co,Sn), (Co,Mn), (Zn,Sn), (Zn,Sb) and (Zn,Mn) were prepared by a modified flux method using δ-FeOOH as a precursor and NaCl as the flux. The doping of (Co,Sn) or (Zn,Sn) effectively reduces both particle size and coercivity, while retaining high magnetization value. Hence BaFe11Co0.5Sn0.5O19 and BaFe 11Zn0.5Sn particles, which were calcined at 850°C to 950°C for four hours, have a coercivity of 650 to 1000 Oe, a saturation magnetization of 60 to 90 emu/g, and an average particle size of around 150 nm with fine platelet shape. They are thus potential candidates for high density recording media
Keywords :
X-ray diffraction examination of materials; barium compounds; coercive force; ferrimagnetic properties of substances; ferrites; heat treatment; magnetic properties of fine particles; magnetic recording; magnetisation; particle size; transmission electron microscope examination of materials; 150 nm; 850 to 950 C; BaFe12-x-yCoxMnyO19; BaFe12-x-yCoxSnyO19; BaFe12-x-yZnxMnyO19; BaFe12-x-yZnxSbyO19; BaFe12-x-yZnxSnyO19; NaCl; TEM; X-ray diffraction; average particle size; calcination; coercivity; high density recording media; magnetization; modified flux method; platelet shape; saturation magnetization; vibrating sample magnetometer; Calcination; Coercive force; Doping; Filtering; Iron; Magnetic properties; Saturation magnetization; Water heating; X-ray scattering; Zinc;
