Brillouin light scattering study of transverse mode coupling in confined yttrium iron garnet/barium strontium titanate multiferroic

Using the space-resolved Brillouin light scattering spectroscopy we study the transformation of dynamic magnetization patterns in a bilayer multiferroic structure. We show that in the comparison with a single yttrium iron garnet (YIG) film magnetization distribution is transformed in the bilayer structure due to the coupling of waves propagating both in an YIG film (magnetic layer) and in a barium strontium titanate slab (ferroelectric layer). We present a simple electrodynamic model using the numerical finite element method to show the transformation of eigenmode spectrum of confined multiferroic. In particular, we demonstrate that the control over the dynamic magnetization and the transformation of spatial profiles of transverse modes in magnetic film of the bilayer structure can be performed by the tuning of the wavevectors of transverse modes. The studied confined multiferroic stripe can be utilized for fabrication of integrated dual tunable functional devices for magnonic applications.

[1]  S. Nikitov,et al.  Nonreciprocal propagation of hybrid electromagnetic waves in a layered ferrite–ferroelectric structure with a finite width , 2015 .

[2]  B. Hillebrands,et al.  Brillouin light scattering studies of confined spin waves: linear and nonlinear confinement , 2001 .

[3]  Gopalan Srinivasan,et al.  Electrically tunable ferrite-ferroelectric microwave delay lines , 2005 .

[4]  A. Sadovnikov,et al.  Multimode Propagation of Magnetostatic Waves in a Width-Modulated Yttrium-Iron-Garnet Waveguide , 2014, IEEE Magnetics Letters.

[5]  R. Damon,et al.  Magnetostatic modes of a ferromagnet slab , 1961 .

[6]  A. Sadovnikov,et al.  Magnonic beam splitter: The building block of parallel magnonic circuitry , 2015 .

[7]  A. Serga,et al.  Magnon transistor for all-magnon data processing , 2014, Nature Communications.

[8]  A. Sadovnikov,et al.  Multimode Surface Magnetostatic Wave Propagation in Irregular Planar YIG Waveguide , 2014 .

[9]  Gopalan Srinivasan,et al.  Ferrite-ferroelectric hybrid wave phase shifters , 2007 .

[10]  B. Leven,et al.  Design of a spin-wave majority gate employing mode selection , 2014, 1408.3235.

[11]  V. E. Demidov,et al.  Spin-current nano-oscillator based on nonlocal spin injection , 2015, Scientific Reports.

[12]  S. Urazhdin,et al.  Dipolar field-induced spin-wave waveguides for spin-torque magnonics , 2015 .

[13]  S. Demokritov,et al.  Magnonic Waveguides Studied by Microfocus Brillouin Light Scattering , 2015, IEEE Transactions on Magnetics.

[14]  A. Ustinov,et al.  Multiferroic periodic structures based on magnonic crystals for electronically tunable microwave devices , 2014 .

[15]  A. Nikitin,et al.  Observation of envelope solitons of spin electromagnetic waves in a layered multiferroic structure , 2015 .

[16]  D. Allwood,et al.  Towards graded-index magnonics: Steering spin waves in magnonic networks , 2015 .

[17]  S. Nikitov,et al.  Spatiotemporal dynamics of magnetostatic and spin waves in a transversely confined ferrite waveguide , 2013 .

[18]  P. Edenhofer,et al.  Electrical tuning of dispersion characteristics of surface electromagnetic-spin waves propagating in ferrite-ferroelectric layered structures , 2003 .

[19]  A. Slavin,et al.  Magnonics: a new research area in spintronics and spin wave electronics , 2015 .

[20]  S. Bajpai.  Excitation of magnetostatic surface waves: effect of finite sample width , 1985 .

[21]  B. Hillebrands,et al.  Spinwaves in Laterally Confined Magnetic Structures , 2002 .

[22]  P. Edenhofer,et al.  Dipole-exchange theory of hybrid electromagnetic-spin waves in layered film structures , 2002 .

[23]  A. Ustinov,et al.  Multifunctional nonlinear magnonic devices for microwave signal processing , 2010 .

[24]  T. W. O’Keeffe,et al.  Magnetostatic surface‐wave propagation in finite samples , 1978 .

[25]  S. A. Nikitov,et al.  The electrodynamic characteristics of a finite-width metal/dielectric/ferroelectric/dielectric/metal layer structure , 2014 .

[26]  A. Ustinov,et al.  A microwave nonlinear phase shifter , 2008 .

[27]  Patryk Krzysteczko,et al.  Mode interference and periodic self-focusing of spin waves in permalloy microstripes , 2008 .