Structure and magnetic properties of barium hexaferrite (BaM) thin films strongly depends on the process such as calcinations temperature and calcinations time. The purpose of this paper is to study the influence of calcinations on the structural and magnetic properties of BaM thin films. BaM thin films have been prepared on silicon substrates by a chemical solution deposition technique using an aqueous solution of metal nitrates. Coated films are heat treated at 800°C to 1,000°C with various calcinations times. The films are characterized using X-ray diffraction, field emission scanning electron microscopy, and vibrating sample magnetometer. The XRD pattern shows that the formation of a single phase films depends on the calcinations temperature and calcinations time. With the rise in calcinations temperature and calcinations time, the mobility of atoms increase then increasing the chances of the formation of a single phase. When calcinations time was increased, the coercivity (Hc) of the samples increased.