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Electromagnetics and Photonics Commons™
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- Keyword
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- Barium ferrite (3)
- FMR (2)
- Broad band filters (1)
- Coplanar waveguides (1)
- Faraday rotation (1)
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- Ferromangetic (1)
- Field modulation techniques (1)
- KL (1)
- Kasuya LeCraw two magnon one phonon mechanism (1)
- Kasuya-Le Craw process (1)
- Lineshape asymmetry (1)
- Low insertion loss devices (1)
- Magnon continuum (1)
- Multilayer ferrite structures (1)
- Phase shifts (1)
- Quantum mechanical mechanism (1)
- Resonance (1)
- Rotators (1)
- Scattering (1)
- Suhl instabilities (1)
- Transmission coefficient (1)
- Trigonal site single particle excitations (1)
- Yttrium iron garnet (1)
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Articles 1 - 5 of 5
Full-Text Articles in Electromagnetics and Photonics
Measurements And Simulations Of Micron Size Coplanar Waveguides, S. Zhang, J. B. Sokoloff, C. Vittoria
Measurements And Simulations Of Micron Size Coplanar Waveguides, S. Zhang, J. B. Sokoloff, C. Vittoria
Jeffrey Sokoloff
Measurements and simulations have been done on a coplanar waveguide, which consists of a pair of slots which taper down to a separation and width of micron size. The purpose of this device is to permit one to concentrate microwaves or millimeter waves on magnetic samples of the order of a micron in order to do ferrimagnetic resonance (FMR) studies on such small samples. The transmission coefficient as a function of frequency found in the simulations agrees quite well with the measurements. The simulations show that the magnetic field at the pinch is about a factor of several thousand larger …
Possible Low-Loss Faraday-Rotation And Phase-Shifts Using Multilayer Ferrite Structures, J. Sokoloff, C. Vittoria
Possible Low-Loss Faraday-Rotation And Phase-Shifts Using Multilayer Ferrite Structures, J. Sokoloff, C. Vittoria
Jeffrey Sokoloff
It is suggested that it should be possible to make low insertion loss devices (e.g., Faraday rotators, phase shifters, and broad-band filters) to operate in the millimeter wave range using a multilayer array of thin films magnetized perpendicular to the films with waves of frequency below the magnon continuum normally incident.
Frequency-Dependence Of The Ferromagnetic-Resonance Linewidth Of Barium Ferrite, M. Elrayess, J. Sokoloff, C. Vittoria, W. Spurgeon
Frequency-Dependence Of The Ferromagnetic-Resonance Linewidth Of Barium Ferrite, M. Elrayess, J. Sokoloff, C. Vittoria, W. Spurgeon
Jeffrey Sokoloff
Ferromagnetic resonance was measured in both a swept frequency mode of operation, in which the magnetic field was fixed, and a field swept mode, using field modulation techniques. Single-crystal spheres of 0.381, 0.305, and 0.483 mm in diameter were inserted in the waveguide and transmission was observed in the measurement. The g values for all the spheres averaged to 2.052 ± 0.011 and the uniaxial anisotropy field was 16.4 kOe. Our measurements show that the linewidth of barium ferrite is nearly independent of resonant frequency from 48 to 105 G Hz. This is in disagreement with the Kasuya-LeCraw two-magnon-one-phonon mechanism, …
Intrinsic Ferromagnetic Resonance Linewidth Of Barium Ferrite Due To Spin-Wave Scattering By Trigonal Site Single-Particle Excitations, J. Sokoloff, S. Marshall, C. Vittoria
Intrinsic Ferromagnetic Resonance Linewidth Of Barium Ferrite Due To Spin-Wave Scattering By Trigonal Site Single-Particle Excitations, J. Sokoloff, S. Marshall, C. Vittoria
Jeffrey Sokoloff
Time-dependent two-magnon scattering was previously proposed as a mechanism to explain the large magnitude of the ferrimagnetic resonance (FMR) linewidth of barium ferrite as a function of frequency. In the present work, it is shown that a quantum mechanical mechanism like the Kasuya-Le Craw process (KL) but with the phonon excitation replaced by a single-particle excitation of a trigonal site iron ion, which moves in an anharmonic potential well, gives a linewidth contribution of less than a tenth of an Oersted and proportional to the frequency, as in the KL mechanism. We conclude, based on this work and our previous …
Ferrimagnetic Resonance Lineshape Asymmetry Due To Suhl Instabilities, P. Dorsey, J. Sokoloff, C. Vittoria
Ferrimagnetic Resonance Lineshape Asymmetry Due To Suhl Instabilities, P. Dorsey, J. Sokoloff, C. Vittoria
Jeffrey Sokoloff
We present calculations of the ferrimagnetic resonance lineshapes resulting from second order Suhl instabilities for thin films and spheres. We find that whereas a spherical sample has a lineshape which is symmetrical around the resonant frequency, a thin film has an asymmetrical lineshape. The calculations are in agreement with measurements that we have performed of the lineshape as a function of input power for thin film samples of both barium ferrite and yttrium iron garnet. When the magnetic field direction is changed from perpendicular to parallel to the film plane, the asymmetry of the lineshape at magnetic resonance changes in …