Parametric Generation of Propagating Spin Waves in Ultrathin Yttrium Iron Garnet Waveguides. Issue 4 (20th February 2020)

• Record Type: Journal Article
• Authors: Mohseni, Morteza; Kewenig, Martin; Verba, Roman; Wang, Qi; Schneider, Michael; Heinz, Björn; Kohl, Felix; Dubs, Carsten; Lägel, Bert; Serga, Alexander A.; Hillebrands, Burkard; Chumak, Andrii V.; Pirro, Philipp
• Is Part Of: Physica status solidi. Volume 14:Issue 4(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-02-20
• Subjects: magnonics -- nonlinear wave dynamics -- parametric pumping -- spin waves -- spintronics; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.202000011
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : Herein, experimental demonstration of the parallel parametric generation of spin waves in a microscaled yttrium iron garnet waveguide with nanoscale thickness is presented. Using Brillouin light scattering microscopy, the parametric excitation of the first and second waveguide modes by a stripline microwave pumping source is observed. Micromagnetic simulations reveal the wave vector of the parametrically generated spin waves. Based on analytical calculations, which are in excellent agreement with experiments and simulations, it is proved that the spin‐wave radiation losses are the determinative term of the parametric instability threshold in this miniaturized system. The used method enables the direct excitation and amplification of nanometer spin waves dominated by exchange interactions. The presented results pave the way for integrated magnonics based on insulating nanomagnets. Abstract : Brillouin light scattering microscopy is used to investigate the parametric generation of propagating spin waves in a nanometer‐thick yttrium iron garnet waveguide. Analytical calculations which are in excellent agreement with the experiments prove the determinative role of the spin‐wave radiation losses on the parametric instability threshold in this miniaturized system.