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Fri, 02 Mar 2001 00:00:00 +0100Fri, 02 Mar 2001 00:00:00 +0100Mode beating of spin wave beams in ferrimagnetic Lu2.04Bi0.96Fe5O12 films
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/878
Absract: We report on measurements of the two-dimensional intensity distribtion of linear and non-linear spin wave excitations in a LuBiFeO film. The spin wave intensity was detected with a high-resolution Brillouinlight scatteringspectroscopy setup. The observed snake-like structure of the spin wave intensity distribution is understood as a mode beating between modes with different lateral spin wave intensity distributions. The theoretical treatment of the linear regime is performed analytically, whereas the propagation of non-linear spin waves is simulated by a numerical solution of a non-linear Schrödinger equation with suitable boundary conditions.Oliver Büttner; Martin Bauer; Christoph Mathieu; Serguei Demokritov; Burkard Hillebrands; P.A. Kolodin; M.P. Kostylev; S. Sure; H. Dötsch; V. Grimalsky; Yu. Rapoport; A.N. Slavinpreprinthttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/878Fri, 02 Mar 2001 00:00:00 +0100Observation of spatiotemporal self-focusing of spin waves in magnetic films
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/947
The first observation of spatiotemporal self-focusing of spin waves is reported. The experimental results are obtained for dipolar spin waves in yttrium-iron-garnet films by means of a newly developed space- and time-resolved Brillouin light scattering technique. They demonstrate self-focusing of a moving wave pulse in two spatial dimensions, and formation of localized two-dimensional wave packets, the collapse of which is stopped by dissipation. The experimental results are in good qualitative agreement with numerical simulations.Martin Bauer; Oliver Büttner; Serguei Demokritov; Burkard Hillebrands; Y. Grimalsky; Yu Rapoport; Slavin A.N.preprinthttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/947Thu, 10 Feb 2000 00:00:00 +0100Linear and Nonlinear Diffraction of Dipolar Spin Waves in Yttrium Iron Garnet Films Observed by Space- and Time-Resolved Brillouin Light Scattering,
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/935
A new advanced space- and time-resolved Brillouin light scattering (BLS) technique is used to study diffraction of two-dimensional beams and pulses of dipolar spin waves excited by strip-line antennas in tangentially magnetized garnet films. The new technique is an effective tool for investigations of two-dimensional spin wave propagation with high spatial and temporal resolution. Linear effects, such as the unidirectional exci-tation of magnetostatic surface waves and the propagation of backward volume magnetostatic waves (BVMSW) in two preferential directions due to the non-collinearity of their phase and group velocities are investigated in detail. In the nonlinear regime stationary and non-stationary self-focusing effects are studied. It is shown, that non-linear diffraction of a stationary BVMSW beam, having a finite transverse aperture, leads to self-focusing of the beam at one spatial point. Diffraction of a finite-duration (non-stationary) BVMSW pulse leads to space-time self-focusing and formation of a strongly localized two-dimensional wave packet (spin wave bullet). Numerical modeling of the diffraction process by using a variational approach and direct numerical integration of the two-dimensional non-linear Schrödinger equation provides a good qualitative description of the observed phenomena.Oliver Büttner; Martin Bauer; Serguei Demokritov; Yu.S. Kivshar; V. Grimalsky; Yu. Rapoport; A.N. Slavinpreprinthttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/935Tue, 08 Feb 2000 00:00:00 +0100Space- and time-resolved Brillouin light scattering from nonlinear spinwave packets
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/938
Oliver Büttner; Martin Bauer; Andreas Rueff; Serguei Demokritov; Burkard Hillebrands; A.N. Slavin; M.P. Kostylevpreprinthttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/938Tue, 08 Feb 2000 00:00:00 +0100Spatial and Spatio-Temporal Self-Focusing of Spin Waves in Garnet Films Observed by Space- and Time-Resolved Brillouin Light Scattering
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/940
A new advanced space- and time-resolved Brillouin light scattering technique is used to study diffraction of two-dimensional beams and pulses of dipolar spin waves excited by strip-line antennas in tangentially magnetized garnet films. The technique is an effective tool for investigations of two-dimensional spin wave propagation with high spatial and temporal resolution. Nonlinear effects such as stationary and nonstationary self-focusing are investigated in detail. It is shown, that nonlinear diffraction of a stationary backward volume magnetostatic wave (BVMSW) beam, having a finite transverse aperture, leads to selffocusing of the beam at one spatial point. Diffraction of a finite-duration (non-stationary) BVMSW pulse leads to space-time self-focusing and formation of a strongly localized two-dimensional wave packet (spin wave bullet).Oliver Büttner; Martin Bauer; Jürgen Fassbender; Burkard Hillebrandspreprinthttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/940Tue, 08 Feb 2000 00:00:00 +0100Anisotropic magnetic coupling of permalloy micron dots forming a square lattice
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/926
Static magnetic and spin wave properties of square lattices of permalloy micron dots with thicknesses of 500 Å and 1000 Å and with varying dot separations have been investigated. A magnetic fourfold anisotropy was found for the lattice with dot diameters of 1 micrometer and a dot separation of 0.1 micrometer. The anisotropy is attributed to an anisotropic dipole-dipole interaction between magnetically unsaturated parts of the dots. The anisotropy strength (order of 100000 erg/cm^3 ) decreases with increasing in-plane applied magnetic field.Christoph Mathieu; Martin Bauer; Oliver Büttner; Steffen Riedling; Björn Roos; Serguei Demokritov; Burkard Hillebrands; C. Hartmann; B. Bartenlian; C. Chappert; D. Decanini; F. Rousseaux; E. Cambril; A. Müller; B. Hoffmann; U. Hartmannarticlehttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/926Wed, 01 Jan 1997 00:00:00 +0100Static and dynamic properties of patterned magnetic permalloy films
https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/930
Static magnetic and spin wave properties of square lattices of permalloy micron dots with thicknesses of 500 Å and 1000 Å and with varying dot separations have been investigated. The spin wave frequencies can be well described taking into account the demagnetization factor of each single dot. A magnetic four-fold anisotropy was found for the lattice with dot diameters of 1 micrometer and a dot separation of 0.1 micrometer. The anisotropy is attributed to an anisotropic dipole-dipole interaction between magnetically unsaturated parts of the dots. The anisotropy strength (order of 100000 erg/cm^3 ) decreases with increasing in-plane applied magnetic field.Burkard Hillebrands; Christoph Mathieu; C. Hartmann; Martin Bauer; Oliver Büttner; Steffen Riedling; Björn Roos; Serguei Demokritov; B. Bartenlian; C. Chappert; D. Decanini; F. Rousseaux; E. Cambril; A. Müller; B. Hoffmann; U. Hartmannarticlehttps://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/930Wed, 01 Jan 1997 00:00:00 +0100