Subsidiary Resonance in Planar Hexagonal Ferrites PDF Download
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Author: Maurice Weiner
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Subsidiary resonance phenomena in single-crystal ZnY and Mn-ZnY have been theoretically and experimentally investigated. Using a general expression for the first-order spin-wave instability, the threshold fields for pump frequencies above the characteristic frequency are calculated. Good agreement is shown between experimental data and theoretical predictions. (Author).
Author: Maurice Weiner
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Book Description
Subsidiary resonance phenomena in single-crystal ZnY and Mn-ZnY have been theoretically and experimentally investigated. Using a general expression for the first-order spin-wave instability, the threshold fields for pump frequencies above the characteristic frequency are calculated. Good agreement is shown between experimental data and theoretical predictions. (Author).
Author: Samuel Dixon (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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A ferromagnetic resonance linewidth of 3.8 oersteds at 9.0 kMc and room temperature represents a considerable improvement in material technology for hexagonal ferrites with planar anisotropy. The linewidth compares favorably with that found in single-crystal YIG and in lithium ferrite. This investigation has shown that the large planar anisotropy endows ZnY materials with several distinct advantages in enhancing the design of microwave devices. The anisotropy field increases the frequency range for the coincidence of the first- and second-order processes, which inherently gives a lower threshold power level. In addition, the anisotropy field tends to decrease the critical field (power level) at which spin-wave instabilities set in. From the measured threshold field, a spin-wave linewidth of 0.74 oersteds has been calculated for manganese-substituted ZnY. A variety of investigations on the feasibility of microwave devices using manganese-substituted ZnY are currently in the design stage. Among them are an orthogonal resonant strip-line gyromagnetic limiter at X-band frequencies, a parallel pumped shunt arm cavity limiter at K sub-band frequencies, and a TE101 cavity subsidiary resonance limiter. (Author).
Author:
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ISBN:
Category : Science
Languages : en
Pages : 684
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Author: Samuel Dixon (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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To satisfy Army device requirements in radar, countermeasures, and satellite systems between 9 and 140 kMc, a wide variety of nonlinear, ferromagnetic components such as power limiters, tunable filters, and pulsed, ferromagnetic generators must be designed and constructed. Such devices, presently restricted because of an inherent frequency limitation or the prohibitively large d-c field requirement, demand a material with unique properties (high magnetic anisotropy) to permit efficient device operation with small, applied fields. After several years of research and development, single crystals of ZnY (Ba2Zn2Fe2O3), modified by substituted manganese, have yielded crystals with a resonance linewidth of 3.8 oersteds at 9.0 kMc and room temperature. This represents the lowest value reported for planar, hexagonal ferrites. From the observed threshold field, a spin-wave linewidth of 1.24 oersteds was calculated. An experimental subsidiary resonance limiter at 17.2 kMc was designed and its characteristics are being evaluated using Mn-ZnY crystals. At Ku-band frequencies and above, d-c magnetic field requirements are smaller for Mn-ZnY than for yttrium-iron-garnet, permitting a smaller, lighter device. (Author).
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Category : Aeronautics
Languages : en
Pages : 328
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Author:
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Category :
Languages : en
Pages : 8
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This final report presents a review of the work accomplished on this contract. A review of the physics of hexagonal ferrite materials and the effective linewidth concept and the detailed overall research plan are contained in the original proposal document. The focus of the program was on the effective linewidth in millimeter wave materials, including planar hexagonal ferrite Y- type materials, uniaxial M-type materials, and thin ferromagnetic transition metal and alloy films. The key idea in the original proposal was that the ferromagnetic resonance linewidth in hexagonal ferrites is dominated by inhomogeneous and two-magnon scattering losses and that off-resonance measurements of the effective linewidth would (1) show that the FMR losses do not represent the intrinsic losses and (2) that the intrinsic losses are significantly lower. This basic idea was verified. Results were obtained on the off-resonance far-field effective linewidth in planar Zn-Y hexagonal ferrite single crystal platelets, single crystal spheres of Ba- and Sr-hexaferrite materials, and permalloy thin films. Three papers on these results have been published.
Author: Walter Viehmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Ferromagnetic resonance was measured on crystal-oriented samples of the Co delta Ti delta M series prepared by means of topotactical reactions. Samples with a high degree of alignment were obtained with anisotropies ranging from +6000 oe (uniaxial) to -4900 oe (planar). Resonance conditions can in general be described by existing theories, developed for single crystals of hexagonal crystal structure. Line width measurements on these materials are also viewed in the light of existing theories. (Author).
Author: Charles Elwood LeMere
Publisher:
ISBN:
Category : Ferrites (Magnetic materials)
Languages : en
Pages : 80
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 840
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Author: Isidore Bady
Publisher:
ISBN:
Category :
Languages : en
Pages : 376
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