Magnetism

Tunneling of magnetoacoustic waves through a gap in ferromagnetic crystals with a relative longitudinal displacement

E. A. Vilkov^a, A. V. Moiseev^a, V. G. Shavrov<sup>b

a</sup> Ul'yanovsk Branch of Institute of Radioengineering and Electronics, Russian Academy of Sciences
^b Kotelnikov Institute of Radioengineering and Electronics of the Russian Academy of Sciences, Moscow

Abstract: The tunneling of a plane monochromatic acoustic wave through a gap between two ferromagnets under conditions of their relative longitudinal displacement has been considered. It has been shown that, when the gap thickness $h$ is comparable to the wavelength, the complete transmission of the acoustic wave at the Damon–Eshbach frequency becomes possible. When the gap thickness is smaller than the wavelength, the complete transmission of the acoustic wave occurs but already at two resonant frequencies. The inclusion of the longitudinal displacement of one of the crystals, in all cases, leads to the violation of resonance conditions and, consequently, to a noticeable decrease in the coefficient of transmission of the acoustic wave through the gap between two ferromagnets; this effect is more pronounced, the higher is the velocity of motion of the crystal. It has been demonstrated that there is a possibility of the wave front reversal occurring with the amplification of the reflected magnetoacoustic wave.

Received: 24.06.2010
Accepted: 15.07.2010

 English version: Physics of the Solid State, 2011, 53:3, 504–509

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