Propagation of Spin Waves Excited in a Permalloy Film by a Finite-Ground Coplanar Waveguide: A Combined Phase-Sensitive Micro-Focused Brillouin Light Scattering and Micromagnetic Study
| Autor: | Gianluca Gubbiotti, Lorenzo Fallarino, Silvia Tacchi, G. Duerr, Marco Madami, Giovanni Carlotti, Dirk Grundler |
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| Rok vydání: | 2013 |
| Předmět: |
numerical analysis
metallic thin films Antenna measurements Magnetization magnetic thin films symmetry breaking Light scattering spin wave propagation finite-width ground lines Spin wave Dispersion relation dynamical magnetization Physics Condensed matter physics user-defined periodic boundary conditions Coplanar waveguide Dispersion two dimensional fast Fourier transform algorithm Electronic Optical and Magnetic Materials fast Fourier transforms Surface wave patterned magnetic films spin waves (SWs) frequency spectrum Permalloy phase-sensitive microfocused Brillouin light scattering spatial profile micromagnetics microwave current finite-ground coplanar waveguide permalloy film Brillouin spectra spin waves magnetostatic surface wave geometry Brillouin light scattering Optics asymmetric emission magnetisation Electrical and Electronic Engineering coplanar waveguides Dispersion (water waves) spin wave excitation business.industry Ni80Fe20 one dimensional fast Fourier transform algorithm Optical waveguides Brillouin zone microwave spectra extended system Antennas business near-field effects |
| Zdroj: | IEEE Transactions on Magnetics. 49:1033-1036 |
| ISSN: | 1941-0069 0018-9464 |
| DOI: | 10.1109/tmag.2012.2229385 |
| Popis: | The excitation of spin waves by a microwave current injected into a coplanar waveguide with finite-width ground lines on a continuous Permalloy film is investigated both experimentally and numerically. Phase sensitive micro-focused Brillouin light scattering has been employed to reveal the spatial profile of the propagating spin waves in the magnetostatic surface wave geometry. The experimental results have been satisfactorily reproduced by means of micromagnetic simulations. The exciting microwave field used in this simulation has the spatial profile defined by the coplanar waveguide and user-defined periodic boundary conditions were employed in order to simulate the extended system. The resulting space and time dependent evolution of the magnetization has been analyzed by means of one and two dimensional fast Fourier transform algorithm in order to obtain the spatial profile and the frequency spectrum of the excited spin waves as well as their dispersion relations. Evidence is given to asymmetric emission from the two sides of the coplanar waveguide due to the symmetry breaking related to the sense of precession of the dynamical magnetization, as well as to the near-field effects of the extended spin wave emitter. |
| Databáze: | OpenAIRE |
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