Results 181 to 190 of about 2,238 (223)

Parametric excitation of spin waves by phonon pumping

Journal of Applied Physics, 1973
Parametric excitation of spin waves by a traveling phonon pump is possible because of the magnetoelastic interaction. Expressions for the threshold phonon intensity required for spin-wave pair excitation are presented. The functional dependence of the threshold intensity on pump frequency, internal field, and other pertinent parameters has been ...
Donald H. Lyons, H. Matthews
openaire   +1 more source

Parametric excitation of spin waves in uniaxial ferrites

Technical Physics, 1998
Parametric excitation of spin waves in uniaxial ferrites with large anisotropy is investigated theoretically. First-order processes in a sphere with arbitrary orientation of an external static magnetic field, in which case the pumping is oblique, are studied.
A. V. Nazarov, A. G. Gurevich
openaire   +1 more source

Spin effect on parametric interactions of waves in magnetoplasmas

Physics of Plasmas, 2012
The parametric decay instability of upper hybrid wave into low-frequency electromagnetic Shear Alfvén wave and Ordinary mode radiation (O-mode) has been investigated in an electron-ion plasma immersed in the uniform external magnetic field. Incorporating quantum effect due to electron spin, the fluid model has been used to investigate the linear and ...
M. Shahid, D. B. Melrose, M. Jamil, G. Murtaza   +3 more
openaire   +1 more source

Nonlinear Parametric Excitation of Spin Waves

1998
This work is devoted to the nonlinear effects which are connected with parametric interaction of spin waves in ferrites. Parametric processes under the action of both single and numerous microwave signals are considered. The number of original results on amplification of backward volume wave envelope solitons, phase conjugation of pulse signal and echo
G. A. Melkov, A. A. Serga
openaire   +1 more source

On the transient and stationary parametric excitation of spin waves

Journal of Magnetism and Magnetic Materials, 1999
Abstract Buildup times and the stationary values of spin wave excitations near the Suhl instability threshold are calculated numerically. The study is done in the framework of the two-mode model. The time evolution of the excitation may approach the steady state via oscillations that may last for a very long time.
I Laulicht, P.E Wigen
openaire   +1 more source

Wave Front Reversal of a Dipolar Spin Wave Pulse in a Nonstationary Three-Wave Parametric Interaction

Physical Review Letters, 2000
The effects of wave front reversal and inversion of the time profile are observed experimentally for a dipolar spin wave pulse (carrier frequency omega(1)) interacting in a yttrium-iron garnet film with a weakly localized nonstationary parametric pumping (carrier frequency omega(p) congruent with 2omega(1)) in a three-wave process with conservation law
, Melkov, , Serga, , Tiberkevich, , Oliynyk, , Slavin   +4 more
openaire   +2 more sources

Parametric excitation of spin waves in a nonlinear magnetostatic resonator

Technical Physics, 2008
A theory of spin wave parametric instability is developed that simultaneously allows for cubic anisotropy and first- and second-order uniaxial anisotropies. The contributions of various anisotropies to a dispersion relation and first-and second-order nonlinearity coefficients are considered.
M. A. Popov, I. V. Zavislyak
openaire   +1 more source

Temperature-Induced Nonlinearity at Parametrically Excited Spin Waves

Europhysics Letters (EPL), 1991
Parametrically excited spin waves in magnetic spheres of yttrium iron garnet give rise to complex multistable behaviour, which occurs for special experimental conditions at room temperature, but vanishes at helium temperature. This is in contrast to what one expects from the decreasing damping of the spin waves with temperature, which should result in ...
G Wiese, H.-A. Krug Von Nidda, H Benner
openaire   +1 more source

Parametric Excitation of Spin Waves in Ferromagnets with Domain Structure

physica status solidi (b), 1974
AbstractAn investigation is made of the mechanism of the influence of an rf field on ferromagnets with different domain structures leading to a modulation of the internal effective magnetic field, in which the magnetization vector precesses. The calculations are made for the case when external polarizing magnetic field H0 = 0.
B. N. Filippov, V. P. Lukomskii, Yu. G. Lebedev   +2 more
openaire   +1 more source

Spin-wave turbulence beyond the parametric excitation threshold

Soviet Physics Uspekhi, 1974
The nonlinear stage of the parametric excitation of spin waves in ferromagnetic dielectrics is reviewed. The main nonlinear mechanism which limits the amplitude of the exponentially growing waves is the pairing of waves with equal and opposite wave vectors, which leads to the violation of phase relationships.
Vladimir E. Zakharov, V.S. L'vov, S.S. Starobinets   +2 more
openaire   +1 more source