Study of Ferrimagnetic Crystals by Parallel Pumping PDF Download
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Author: James C. Sethares
Publisher:
ISBN:
Category : Crystals
Languages : en
Pages : 136
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Book Description
A study of single-crystal ferrimagnetic crystals at microwave frequencies was conducted. The parallel pumping technique was used to experimentally measure spin-wave line width, magnetoelastic coupling constants, energy exchange constants, and phonon linewidths. The experiments were carried out at 300K, 194K, 77K, and 4.2K at X- and K-band frequencies. Four samples of pure, single-crystal yttrium iron garnet (one disk, and three spheres) were extensively investigated. Conditions for optimum detection sensitivity of spin-wave instability measurement are given and discussed. The theory of parallel pumping is explained and worked out in detail. Expressions are obtained for spin-wave and phonon linewidths, magnetoelastic constants and exchange constants in terms of experimentally measured quantities. A literature search was made for publications dealing with parallel-pumping phenomena. These articles (over 75) are abstracted for their contents relative to this investigation. (Author).
Author: James C. Sethares
Publisher:
ISBN:
Category : Crystals
Languages : en
Pages : 136
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Book Description
A study of single-crystal ferrimagnetic crystals at microwave frequencies was conducted. The parallel pumping technique was used to experimentally measure spin-wave line width, magnetoelastic coupling constants, energy exchange constants, and phonon linewidths. The experiments were carried out at 300K, 194K, 77K, and 4.2K at X- and K-band frequencies. Four samples of pure, single-crystal yttrium iron garnet (one disk, and three spheres) were extensively investigated. Conditions for optimum detection sensitivity of spin-wave instability measurement are given and discussed. The theory of parallel pumping is explained and worked out in detail. Expressions are obtained for spin-wave and phonon linewidths, magnetoelastic constants and exchange constants in terms of experimentally measured quantities. A literature search was made for publications dealing with parallel-pumping phenomena. These articles (over 75) are abstracted for their contents relative to this investigation. (Author).
Author: E. DeBary
Publisher:
ISBN:
Category : Light
Languages : en
Pages : 242
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Book Description
The tables present the results of computations of the intensity and the degree of polarization of sky radiation and radiation scattered by a unit volume of air containing natural aerosols. The tabulated data are based upon new values of the scattering functions i sub 1 and i sub 2 and the scattering cross sections k, derived using the Mie theory with m = 1.5. In the case of primary scattering of radiation, the results are valid for a turbid atmosphere. The tables of the scattering coefficients and optical thickness, the absolute scattering functions, the intensities, and the degrees of polarization are computed for various wavelengths between 0.4 and 1.2 microns and for discrete scattering angles between 0 degrees and 180 degrees. Aerosol size distributions of the form dn(r) = c.r/v dlogr, with v = 2.5, 3.0, and 4.0, are assumed. The lower and upper limits for the size range were chosen as r sub 1 = 0.04, 0.06, and 0.08 micron and r sub 2 = 3, 5, and 10 microns respectively. (Author).
Author: Gerry H. Cabaniss
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ISBN:
Category : Arctic Ocean
Languages : en
Pages : 336
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Author: P. Blacksmith (Jr.)
Publisher:
ISBN:
Category : Radar cross sections
Languages : en
Pages : 26
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Author: Robert E. Riecker
Publisher:
ISBN:
Category : Deformations (Mechanics)
Languages : en
Pages : 120
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Book Description
This first supplement to the 'Bibliography of Experimental Rock Deformation, Second Edition, ' (AD-627 002) AFCRL-65-740, October 1965, lists 111 cross-referenced research articles taken from scientific journals and books. The listings include the following 29 categories: Apparatus, Brittle Behavior, Calcite, Calibration, Conductivity, Creep, Dislocations, Fabric, Friction, General, Ice, Marble, Olivine, Phase Studies, Quartz, Recrystallization, Resistance, Sedimentary Rocks, Seismic Velocities, Shear, Shock, Strain Rate, Surveys, Viscosity, and X-ray. (Author).
Author: A. F. Armington
Publisher:
ISBN:
Category : Chemicals
Languages : en
Pages : 24
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Author: Arnold A. Barnes
Publisher:
ISBN:
Category : Water vapor, Atmospheric
Languages : en
Pages : 20
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Author: William George Chace
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ISBN:
Category : Exploding wire phenomena
Languages : en
Pages : 48
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Author: Robert E. Riecker
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 40
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Author: John T. Jefferies
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ISBN:
Category : Electromagnetism
Languages : en
Pages : 56
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Book Description
Various aspects of solar flares such as dynamic phenomena, the relation to magnetic fields, electromagnetic radiations, particle emissions, and flare loops are discussed with attempts at classification in terms of observable effects. Discrepancies in defining the mechanisms that must exist stress the need for further observations. (Author).
