Volume 123, Number 4, August 2018
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||19 September 2018|
Superdirectional beam of surface spin wave
Kotel'nikov Institute of Radio Engineering and Electronics of Russian Academy of Sciences (Fryazino branch) Vvedensky sq.1, 141190, Fryazino, Moscow region, Russia
Received: 3 July 2018
Accepted: 23 August 2018
The visualized diffraction patterns of a surface spin wave excited by an arbitrarily oriented linear transducer are investigated experimentally in the plane of a tangentially magnetized ferrite film for the case in which the transducer length D is much larger than the wavelength . It is shown experimentally and theoretically that the angular width of a diffracted surface spin wave beam in an anisotropic ferrite film can take values greater or less than and can also be zero. For the last case a superdirectional (non-expanding) beam of the surface spin wave is observed experimentally: the smearing of the beam energy along the film plane is absent and the length of the beam trajectory is maximal . It is found that the well-known Rayleigh criterion used in isotropic media cannot be used to estimate the angular width of spin wave beams. The experimental results are in good agreement with theoretical investigations, predictions, calculations and formulas obtained recently.
PACS: 42.25.Fx – Diffraction and scattering / 75.50.Gg – Ferrimagnetics / 75.30.Ds – Spin waves
© EPLA, 2018
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.