Abstract
Amorphous BaCoTiFe10O19 films have been prepared by the RF sputtering technique. The magnetic and magneto-optical properties, the structure and the effect of annealing have been investigated. The 4.2 K magnetization increases with increasing magnetic field and is not saturated at a high magnetic field of 65 kOe. Above 100 K the susceptibility obeys a Curie-Weiss law with a low Curie constant of 0.81 and a large negative Weiss constant of -350. The effective paramagnetic moment (2.54 mu B) for ion ions is much smaller than the theoretical moment. Amorphous BaCoTiFe10O19 films have a lower magnetization(1.5 emu g-1 at 1.5 K) and higher Curie temperature (850 K) and coercivity (700 Oe at room temperature) than crystalline bulk samples do. After annealing above 750 degrees C, amorphous samples crystallize into single M-type hexaferrite with a magnetization of 320 emu cm-3, a coercivity of 100 Oe and a magneto-optical Faraday rotation of 1 degrees mu m-1 at room temperature.
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