Magnetic and microwave properties of U-type hexaferrite films with high remanence and low ferromagnetic resonance linewidth

作者：Su Zhijuan; Bennett Steven; Hu Bolin; Chen Yajie^*; Harris Vincent G

来源：Journal of Applied Physics, 2014, 115(17): 17A504.

DOI：10.1063/1.4854935

U-type barium hexaferrite films (Ba4Ni1.4Co0.6Fe36O60) were deposited on (0001) sapphire substrates by pulsed laser deposition. Microstructure and magnetic properties of the films were characterized by X-ray diffraction, scanning electron microscopy and vibrating sample magnetometry. Ferromagnetic resonance (FMR) measurements were performed at X-band. The results indicate an anisotropy field of similar to 8 kOe, and the saturation magnetization (4 pi Ms) of similar to 3.6 kG. An optimal post-deposition annealing of films results in a strong (0 0 n) crystallographic texture and a high hysteresis loop squareness (M-r/M-s 92%) leading to self biased properties. Furthermore, the highly self-biased ferrite films exhibited an FMR linewidth of similar to 200 Oe. The U-type hexaferrite films having low microwave loss, low magnetic anisotropy field, and high squareness are a suitable alternative to Sc or In doped BaM ferrites that have been the choice material for self-biased microwave devices at X-band frequencies.

• 出版日期2014-5-7
• 单位东北大学