Pustaka Ilmiah Universitas Padjadjaran

Abstrak

Magnetic Properties of Barium Hexaferrite Thin Films Grown By Pulsed Laser Deposition

Barium hexaferrite BaFe12O19 (BaF) thin films have been prepared by pulsed laser deposition. The target was prepared by solid state reaction method and the films were depositied on c-plane (0001) sapphire substrates with KrF excimer laser at wavelenght of 248 nm and with an energy density of 2.16 J/cm2. During deposition the repetition rate, the temperature, and the time for deposition were varied of: (2 Hz, 700C, 15 minutes) or sample 5715, (5 Hz, 800C, 15 minutes) or sample 5815, (5 Hz, 800C, 30 minutes) or sample 5830, (2 Hz, 800C, 30 minutes) or sample 2830 respectively. The crystal structures were measured by high resolution X-ray diffracometer (HR-XRD) and the grain size were calculated by Scherrer equation. The magnetic properties were measured using SQUID-vibrating sample magnetometer (SQUID-VSM) at a maximum 5kOe, and an atomic force microscope (AFM) was used to detected surface morfologi. The XRD measurement shows that the BHF phase was observed in the sample grown at 800C with the calculated grain size were 11.41 nm (2830) and 15.38 nm (5815). The VSM measurement shows that the: Ms,Mr and moment were increase in the series of 5715 to 5830 to 5815 and to 2830, however the Hc maximum observe at series of 5715. An AFM image shows that the roughness average were 59.6 nm (5715), 24.6 nm (5815) and 36.9 nm (2830). After annealing at 1000C for 2 h the magnetic properties was decrease. The effects of parameter deposition and grain size and its development in the future will be discussed relation to the magnetic characteristics.