Ferromagnetic Line Width of Nonoriented Polycrystalline Hexagonal Ferrites with Large Magnetic Anisotropy Fields (Correspondence)

Bady, I.; McCall, Gilbert

doi:10.1109/tmtt.1963.1125695

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…The value of the linewidth was less than the previously observed ͑⌬H Ͼ 2 kOe͒ in polycrystalline BaM ferrite. 11,12 There are various mechanisms that broaden the linewidth and they include…”

Section: Resultsmentioning

confidence: 99%

Microwave and magnetic properties of self-biased barium hexaferrite screen printed thick films

Chen

Geiler

Sakai

et al. 2006

Journal of Applied Physics

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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 BaFe 12 O 19 ferrite thick films ͑100-400 m͒. 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 m thickness yielded a high squareness ͑M r / M s ͒ of 0.93. Ferrimagnetic resonance ͑FMR͒ 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.

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Section: Resultsmentioning

confidence: 99%

Microwave and magnetic properties of self-biased barium hexaferrite screen printed thick films

Chen

Geiler

Sakai

et al. 2006

Journal of Applied Physics

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Ferrite uses at millimeter wavelengths

Vittoria

1980

Journal of Magnetism and Magnetic Materials

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Nonreciprocal reflection of electromagnetic waves from magnetized ferrite

Srivastava

1978

Journal of Applied Physics

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The reflection of a uniform plane wave from a ferrite magnetized normal to the plane of incidence has been investigated. The conditions for the occurrence of ordinary and total reflection from a lossless planar ferrite have been tabulated for all possible combinations of the relevant parameters. The phase shift on total reflection from a lossless ferrite is found to be nonreciprocal and magnetically tunable. The absorption of electromagnetic power on reflection from a lossy ferrite is also nonreciprocal. The dependence of differential phase shift and reflection loss on various parameters has been numerically investigated. The results indicate the utility of magnetized ferrite in reflection-beam differential phase shifter and isolater, operated in the millimeter-wavelength region.

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Ferromagnetic Line Width of Nonoriented Polycrystalline Hexagonal Ferrites with Large Magnetic Anisotropy Fields (Correspondence)

Cited by 4 publications

References 2 publications

Microwave and magnetic properties of self-biased barium hexaferrite screen printed thick films

Microwave and magnetic properties of self-biased barium hexaferrite screen printed thick films

Ferrite uses at millimeter wavelengths

Nonreciprocal reflection of electromagnetic waves from magnetized ferrite

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