Barium Hexaferrite Thick Films for Microwave Absorbers and Circulators
نویسندگان
چکیده
Barium hexaferrite (BaHF) with the chemical formula BaFe12O19 is a hard magnetic material and has high magnetic anisotropy field (MAF), 17 kOe. The easy direction of magnetization corresponds to the crystallographic c-axis and BaHF particles orient in this direction when are exposed to an external magnetic field. Because of the high MAF, a ferromagnetic resonant frequency appears from 45 to 50 GHz. For these reasons, BaHF can be used for electromagnetic absorbers (above 40 GHz) or for millimetre-wave non-reciprocal devices (i.e. circulators, isolators). Today, most of hexaferrites for microwave and millimetre-wave electronic components are prepared using ceramic technologies. To minimize the size of the electronic components, new techniques for thick-film deposition were developed. One of the simplest techniques is electrophoretic deposition (EPD). In the EPD process, the individually charged particles dispersed in a solvent are transported to the electrode of an opposite charge, where they agglomerate and form the deposit. The dispersed particles are one of the most important conditions for the preparation of homogeneous, dense and oriented deposits.
منابع مشابه
Epitaxially grown BaM hexaferrite films having uniaxial axis in the film plane for self-biased devices
Barium hexaferrite (BaM) films with in-plane c-axis orientation are promising and technically important materials for self-biased magnetic microwave devices. In this work, highly oriented BaM films with different thickness and an in-plane easy axis (c-axis) of magnetization were grown on a-plane single-crystal sapphire substrates by direct current magnetron sputtering. A procedure involving see...
متن کاملRadio-frequency magnetron sputter-deposited barium hexaferrite films on Pt-coated Si substrates suitable for microwave applications
متن کامل
Surfactant-Assisted Electrodeposition of CoFe-Barium Hexaferrite Nanocomposite Thin Films
The influences of anionic sodium dodecylsulfate (SDS) and cationic Hexadecyltrimethylammonium bromide (HTAB) surfactants on the incorporation and distribution of barium hexaferrite nanoparticles in the electrodeposited CoFe-BaFe12O19 composite thin films were studied. Sulphate bathes with natural pH containing 0 to 2 g/L surfactants were used for electroplating at room temperature. Field emissi...
متن کاملHigh-rate reactive ion etching of barium hexaferrite films using optimal CHF3/SF6 gas mixtures
CHF3/SF6 gas mixtures Zhaohui Chen, Aria Yang, Changqing Xie, Qinghua Yang, C. Vittoria, and V. G. Harris Center for Microwave Magnetic Materials and Integrated Circuits and Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115 USA Key Laboratory of Nano-Fabrication and Novel Devices Integrated Technology, Institute of Microelectronics, Chinese ...
متن کاملMagnetic and microwave absorption properties of barium hexaferrite doped with La3+ and Gd3+
In this paper, BaLaxGdxFe12-2xO19 (x=0.2, 0.4, 0.6 and 0.8) were synthesized via sol-gel auto-combustion method. Fourier transform infrared spectroscopy (FTIR) of samples was represented that the bands at 400 and 500 cm-1 were related to the formation of hexaferrite phase. The (x-ray diffraction) XRD patterns were matched exactly with the structure of barium hexaferrite. (Field emission scanni...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2010