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ISSN 2071-0186   Ukr. J. Phys. 2015, Vol. 60, N 5, p.452-457
doi:10.15407/ujpe60.05.0452   Paper

Popov M.A.

Taras Shevchenko National University of Kyiv
(64/13, Volodymyrs’ka Str., Kyiv 01601, Ukraine; e-mail: maxim_popov@univ.kiev.ua)

Parametric Excitation Of Surface Magnetostatic Modes In An Axially Magnetized Elliptic Cylinder Under Longitudinal Pumping

Section: Solid matter
Language: English

Abstract: A rigorous analytical theory of parametric excitation under the longitudinal pumping has been developed for the surface magnetostatic modes of a long elliptic ferrite cylinder magnetized along its axis with regard for the boundary conditions at the surface of the cylinder. It is shown that a pair of frequency-degenerated counter-propagating surface modes at half the pumping frequency can be parametrically excited, and the expressions for the corresponding parametric excitation threshold have been derived. The threshold demonstrates a strong dependence on the mode number and elliptic cylinder’s aspect ratio and tends from above for the large aspect ratio to the value deduced on the basis of the plane-wave analysis. The simple analytical relation between the ratio of axes of the high-frequency magnetization polarization ellipse of excited surface magnetostatic oscillations and the parametric excitation threshold is obtained, discussed, and graphically illustrated.

Key words: parametric processes, surface magnetostatic oscillations, elliptic cylinder, yttrium-iron garnet, film ferrite resonator.