Author: Samuel Dixon (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
Book Description
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).
Evaluation of Single-crystal Planar Hexagonal Ferrites for Application to Microwave Devices
Author: Samuel Dixon (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
Book Description
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).
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
Book Description
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).
Technical Abstract Bulletin
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 780
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 780
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1498
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1498
Book Description
Government-wide Index to Federal Research & Development Reports
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1352
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1352
Book Description
U. S. Government Research and Development Reports
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1776
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1776
Book Description
U.S. Government Research & Development Reports
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 244
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 244
Book Description
Government Reports Annual Index
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 986
Book Description
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 986
Book Description
U.S. Government Research Reports
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 280
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 280
Book Description
Bibliography of Scientific and Industrial Reports
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 870
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 870
Book Description
Government Reports Announcements
Author:
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 1146
Book Description
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 1146
Book Description