Abstract
Zn–Sn substituted barium ferrite particles BaFe 12−2 x Zn x Sn x O 19 with 0⩽ x⩽1.1 have been prepared by a chemical co-precipitation method for the first time. X-ray diffraction (XRD) and transition electron microscopy (TEM) have been carried out to determine the particle structure and morphology. Magnetic properties have been measured using a vibrating sample magnetometer (VSM) with an applied field up to 80 kOe. The specific saturation magnetization M s was determined using the law of approach to saturation, and the effective anisotropy field H a and anisotropy constant K 1 were also estimated. It was found that the particle size could be effectively decreased and coercivity H c easily controlled, by varying x without significantly decreasing saturation magnetization. In particular, BaFe 12−2 x Zn x Sn x O 19 with x=0.7–1.1 has suitable magnetic characteristics and a particle size small enough for high-density magnetic recording.
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