Title
Microwave and magnetic properties of self-biased barium hexaferrite screen printed thick films
Abstract
The interest in barium hexaferrite thick films, particularly with high remanent magnetization, is driven by the development of small planar ferrite microwave devices. We report here processing and microwave characterization of BaFe₁₂O₁₉ ferrite thick films (100-400 μm). The films were deposited on silicon and alumina substrates by screen printing, oriented under a magnetic field of 8 kOe, then annealed at 250°C and sintered at temperatures ranging from 850 to 1300°C. Scanning electron microscopy and x-ray diffraction exhibited strong crystallographic alignment of c-axis crystals perpendicular to the film plane. The magnetization measurement indicated that a typical dense film with 270 μm thickness yielded a high squareness (Mr/Ms) of 0.93. Ferrimagnetic resonance (FMR) measurements were performed in the frequency range of 40-55 GHz. From the linear dependence of FMR frequency on the external field, a g factor of 2.03 ± 0.08 was deduced, while the smallest linewidth was obtained to be 1.2 kOe at 40 GHz. The broadening of the FMR linewidth arises predominantly from magnetic inhomogeneities in the polycrystalline films. The thick films have great potential for use in future microwave and millimeter wave monolithic integrated circuits.
Keywords
barium hexaferrite, remanent magnetization, BaFe₁₂O₁₉, x-ray diffraction, FMR
Subject Categories
Thick films, Paleomagnetism, Microwave devices, Screen process printing, Scanning electron microscopy, Magnetization, Ferromagnetic resonance
Disciplines
Electromagnetics and photonics
Publisher
American Institute of Physics
Publication Date
4-15-2006
Rights Information
Copyright 2006 American Institute of Physics.
Rights Holder
American Institute of Physics
Permanent URL
Recommended Citation
Chen, Y. J.; Geiler, A. L.; Sakai, T.; Yoon, S. D.; Vittoria, C.; and Harris, V. G., "Microwave and magnetic properties of self-biased barium hexaferrite screen printed thick films" (2006). Electrical and Computer Engineering Faculty Publications. Paper 86. http://hdl.handle.net/2047/d20002257
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microwave_and_magnetic_properties_fig1.ppt (66 kB)Figure 1
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microwave_and_magnetic_properties_fig3.ppt (31 kB)
Figure 3
Notes
Originally published in Journal of Applied Physics 99, 08M904 (2006). DOI:10.1063/1.2163288 (http://dx.doi.org/10.1063/1.2163288).