Superdirected beam of the backward volume spin wave

Alexander Yu Annenkov,Sergey V Gerus,Edwin H Lock,N Perov,A Semisalova

doi:10.1051/epjconf/201818502006

Abstract

Visualized patterns of the backward volume spin wave (BVSW) excited by arbitrarily oriented linear transducer in tangentially magnetized ferrite film are investigated experimentally in the plane of ferrite film for the case where the transducer length D is much larger than the wavelength λ0. Superdirected BVSW beam having zero angular width and minimal smearing of the beam energy along the film surface is observed experimentally. Thus, it is proved that such phenomenon as “superdirected propagation of the wave” exists in the nature.

Highlights

Some years ago it was investigated theoretically a twodimensional diffraction patterns arising in the far-field region of a ferrite slab plane for the common geometry, where a plane surface spin wave with noncollinear group and phase velocities is incident on the wide slit in opaque screen with arbitrary orientation [1, 2]
It was shown that this formula is valid for various types of spin waves, and for other waves, propagating in various anisotropic media and structures
Patterns of backward volume spin wave (BVSW) beams excited by arbitrarily oriented linear transducer in tangentially magnetized ferrite film are studied experimentally in the plane of ferrite film for the case, where the transducer length D is much larger than the wavelength λ0

Summary

Introduction

Some years ago it was investigated theoretically a twodimensional diffraction patterns arising in the far-field region of a ferrite slab plane for the common geometry, where a plane surface spin wave with noncollinear group and phase velocities is incident on the wide slit in opaque screen with arbitrary orientation [1, 2]. In order to confirm validity of theoretical results described above, a visualized patterns of the surface spin wave excited by arbitrarily oriented linear transducer were investigated and the angular width of spin wave beams was measured [6]. It was found in the [6] that experimental results are in good agreement with theoretical calculations, basing on [1, 2]. We present the experimental visualized pattern of superdirected BVSW beam excited by arbitrarily oriented linear transducer

Experimental and calculated results

Summary