All-optical detection of phase fronts of propagating spin waves in a Ni81Fe19 microstripe

Vogt, K.; Schultheiß, Katrin; Hermsdoerfer, S. J.; Pirro, Philipp; Serga, A. A.; Hillebrands, B.

doi:10.1063/1.3262348

Cited by 63 publications

(48 citation statements)

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“…For in-plane magnetized films, the anisotropic dispersion relation favours propagation perpendicular to the magnetization direction M. As depicted by the dispersion relations 19 in Fig. 1b (calculated with the material parameters for Ni 81 Fe 19 : saturation magnetization: M S ¼ 800 kA m À 1 , gyromagnetic ratio: g/2p ¼ 28 GHz T À 1 and exchange constant: A ¼ 1.6 Â 10 À 11 J m À 1 ), a perpendicular orientation between the spin-wave wave vector k and the magnetization direction M (dashed, blue line, geometry II) results in a higher group velocity, which is given by the slope of the dispersion, compared with the case of parallel alignment (dotted, red line, geometry I).…”

Section: Resultsmentioning

confidence: 99%

Realization of a spin-wave multiplexer

et al. 2014

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Recent developments in the field of spin dynamics-like the interaction of charge and heat currents with magnons, the quasi-particles of spin waves-opens the perspective for novel information processing concepts and potential applications purely based on magnons without the need of charge transport. The challenges related to the realization of advanced concepts are the spin-wave transport in two-dimensional structures and the transfer of existing demonstrators to the micro-or even nanoscale. Here we present the experimental realization of a microstructured spin-wave multiplexer as a fundamental building block of a magnon-based logic. Our concept relies on the generation of local Oersted fields to control the magnetization configuration as well as the spin-wave dispersion relation to steer the spin-wave propagation in a Y-shaped structure. Thus, the present work illustrates unique features of magnonic transport as well as their possible utilization for potential technical applications.

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Section: Resultsmentioning

confidence: 99%

Realization of a spin-wave multiplexer

et al. 2014

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“…The width of the signal line has been commonly used for calculating the wave number k. As previously shown by optical measurements, generated spin waves have wavelengths between the width of the signal line and infinity (i.e. k = 0) [39,40].…”

Section: Spin Wave Dispersionmentioning

confidence: 99%

Characterization of magnetostatic surface spin waves in magnetic thin films: evaluation for microelectronic applications

et al. 2013

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equally to this work.Abstract The authors have investigated the possibility of utilizing spin waves for inter-and intra-chip communications, and as logic elements using both simulations and experimental techniques. Through simulations it has been shown that the decay lengths of magnetostatic spin waves are affected most by the damping parameter, and least by the exchange stiffness constant.The damping and dispersion properties of spin waves limit the attenuation length to several tens of microns. Thus, we have ruled out the possibility of inter-chip communications via spin waves.Experimental techniques for the extraction of the dispersion relationship have also been demonstrated, along with experimental demonstrations of spin wave interference for amplitude modulation. The effectiveness of spin wave modulation through interference, along with the capability of determining the spin wave dispersion relationships electrically during manufacturing and testing phase of chip production may pave the way for using spin waves in analog computing wherein the circuitry required for performing similar functionality becomes prohibitive.2

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“…This speed exceeds the group and phase velocity of magnons [20], or domain-wall speeds due to spin currents or magnetic fields [21,22].…”

Section: Resonant Scattering From Magnetic Domain Systemsmentioning

confidence: 99%

Ultrafast Dynamics of Magnetic Domain Structures Probed by Coherent Free-Electron Laser Light

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et al. 2013

Synchrotron Radiation News

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2 INTRODUCTIONThe free-electron laser (FEL) sources FLASH in Hamburg, LCLS at Stanford and FERMI in Trieste provide XUV to soft x-ray radiation (FLASH and FERMI) or soft to hard x-ray radiation (LCLS) with unprecedented parameters in terms of ultrashort pulse length, high photon flux, and coherence. These properties make FELs ideal tools for studying ultrafast dynamics in matter on a previously unaccessible level. This paper reviews first results obtained at FEL sources during the last years in the field of magnetism research. We start with pioneering experiments at FLASH demonstrating the feasibility of magnetic scattering at FELs [1,2], then present pump-probe scattering experiments [3,4] as well as the first FEL magnetic imaging experiments [5], and finally discuss a limitation of the scattering methods due to a quenching of the magnetic scattering signal by high-fluence FEL pulses [6]. All of the presented experiments exploit the x-ray magnetic circular dichroism effect [7,8] to obtain element-specific magnetic scattering contrast, as known from synchrotron experiments [9][10][11][12].One of the key problems in modern magnetism research, ultrafast demagnetization discovered by Beaurepaire in 1996 [13], acts on time scales of a few 100 fs, which are not accessible at standard synchrotron radiation sources. Since its discovery, ultrafast demagnetization was studied using optical femtosecond lasers, for a review see e. g.[14], and femtoslicing sources [15] at storage ring sources [16,17]. In both cases, spatial resolution is limited due to wavelength or flux limitations. In contrast, FELs combine high time resolution, element selectivity, and the spatial resolving power of xrays with high photon flux and excellent coherence properties. FEL sources, therefore, promise a pivotal step forward in the investigation of ultrafast phenomena on nanometer length scales. The rapid development of the FELs with respect to even shorter pulses, increased pulse stability, and special double-pulse schemes, e. g. for ultrafast movies [18], will open up exciting new opportunities in the field of material science. RESONANT SCATTERING FROM MAGNETIC DOMAIN SYSTEMSThe very first proof-of-principle resonant magnetic scattering experiment at x-ray FEL sources was carried out at FLASH in Hamburg [1]. In 2009 FLASH covered a photon energy range in the fundamental from 6.5 up to 50 nm with the routinely used cobalt L 3 -edge at 1.59 nm out of reach. However, by using the higher harmonics of the radiation 3 shorter wave length can be reached on the expense of photon flux. In this experiment FLASH was fine tuned to a fundamental wave length of 7.97 nm which results in the fifth harmonic located at the cobalt L 3 -edge. The scattering pattern from magnetic domains of a cobalt/palladium multilayer system with a perpendicular magnetic anisotropy and typical domain widths in the 100 nm range was recorded. This demonstrated that magnetic scattering as it is performed at synchrotron radiation sources is feasible at FELs. However, the fifth harmo...

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All-optical detection of phase fronts of propagating spin waves in a Ni81Fe19 microstripe

Cited by 63 publications

References 15 publications

Realization of a spin-wave multiplexer

Realization of a spin-wave multiplexer

Characterization of magnetostatic surface spin waves in magnetic thin films: evaluation for microelectronic applications

Ultrafast Dynamics of Magnetic Domain Structures Probed by Coherent Free-Electron Laser Light

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