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Full-Text Articles in Engineering
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 …
Ferrimagnetic Resonance Lineshape Asymmetry Due To Suhl Instabilities, P. Dorsey, J. B. Sokoloff, C. Vittoria
Ferrimagnetic Resonance Lineshape Asymmetry Due To Suhl Instabilities, P. Dorsey, J. B. Sokoloff, C. Vittoria
Carmine Vittoria
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 …
Frequency-Dependence Of The Ferromagnetic-Resonance Linewidth Of Barium Ferrite, M. Elrayess, J. B. Sokoloff, C. Vittoria, W. Spurgeon
Frequency-Dependence Of The Ferromagnetic-Resonance Linewidth Of Barium Ferrite, M. Elrayess, J. B. Sokoloff, C. Vittoria, W. Spurgeon
Carmine Vittoria
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. B. Sokoloff, S. P. Marshall, C. Vittoria
Intrinsic Ferromagnetic Resonance Linewidth Of Barium Ferrite Due To Spin-Wave Scattering By Trigonal Site Single-Particle Excitations, J. B. Sokoloff, S. P. Marshall, C. Vittoria
Carmine Vittoria
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 …