Spin Precession Mapping at Ferromagnetic Resonance via Nuclear Resonant Scattering of Synchrotron Radiation

Bocklage, Lars; Swoboda, Christian; Schlage, Kai; Wille, Hans‐Christian; Dzemiantsova, L. V.; Bajt, Saša; Meier, Guido; Röhlsberger, Ralf

doi:10.1103/physrevlett.114.147601

Cited by 13 publications

(29 citation statements)

References 34 publications

(42 reference statements)

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“…This holds up to approximately 20° ref. 29 which lies well in the experimentally obtainable range. Care must be taken to which extent other thermal or non-thermal effects contribute to magnetization dynamics in laser-induced experiments above the low THz regime.…”

Section: Resultssupporting

confidence: 75%

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Model of THz Magnetization Dynamics

Bocklage

2016

Sci Rep

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Magnetization dynamics can be coherently controlled by THz laser excitation, which can be applied in ultrafast magnetization control and switching. Here, transient magnetization dynamics are calculated for excitation with THz magnetic field pulses. We use the ansatz of Smit and Beljers, to formulate dynamic properties of the magnetization via partial derivatives of the samples free energy density, and extend it to solve the Landau-Lifshitz-equation to obtain the THz transients of the magnetization. The model is used to determine the magnetization response to ultrafast multi- and single-cycle THz pulses. Control of the magnetization trajectory by utilizing the THz pulse shape and polarization is demonstrated.

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Section: Resultssupporting

confidence: 75%

“…As observed in Fig. 2 the out-of-plane oscillation is dominant, which is in contrast to the larger in-plane oscillation that one obtains at resonant excitation 29 . The amplitude of the in-plane dynamics is smaller than the amplitude of the out-of-plane dynamics by a factor of about 50.…”

Section: Resultsmentioning

confidence: 58%

Model of THz Magnetization Dynamics

Bocklage

2016

Sci Rep

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“…Major opportunities for fundamental studies [193] Other techniques Nuclear resonant scattering Detection Highest spatial resolution currently achievable [194] X-ray-detected ferromagnetic resonance (XFMR) Detection High spatial resolution, access to layer resolution [195][196][197] Electron-magnon scattering approach Detection Suitable for the detection of domain wall position [198,199] and temporal resolution. For spin-wave excitation techniques the efficiency of excitation, its coherency and the wavenumber range are of primary importance [155-157, 159, 160, 163-165, 168-172, 174, 177-189, 191-199].…”

Section: Detectionmentioning

confidence: 99%

Magnonic crystals for data processing

Chumak

Serga

Hillebrands

2017

J. Phys. D: Appl. Phys.

423

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IntroductionThis article focuses on a selection of results in the field of magnonic crystals obtained within the last decade in our group. Special attention is devoted to the application of magnonic crystals in data processing and information technologies. Because of the large number of achievements in the field, it is unavoidable that many important results are excluded from this article. Therefore, we would like to direct the reader's attention to excellent reviews devoted to different aspects of magnonic crystals: spin-wave dynamics in periodic structures for microwave applications [1, 2], Brillouin light scattering (BLS) studies of planar metallic magnonic crystals [3], micromagnetic computer simulations of width-modulated waveguides [4], photo-magnonic aspects of antidot lattices studies [5], theoretical studies of one-dimensional monomode waveguides [6], and reconfigurable magnonic crystals [7]. The results presented in the current review were already partially presented in our own reviews of yttrium iron garnet (YIG) magnonics [8] and magnon spintronics [9] as well as in book chapters on dynamic magnonic crystals [10] and magnon spintronics [11].The article is organized in the following way: In the introduction we describe the field of magnon spintronics and discuss the role of magnonic crystals in it. The next section 2 is devoted to the properties of spin waves in thin planar films and waveguides, to the magnetic materials commonly used in the field, and to the methods of spin-wave excitation and detection. Sections 3 and 4 are devoted to the study of physical phenomena taking place in static and dynamic magnonic crystals, respectively. The application of magnonic crystals for magnonbased processing of analog and digital data is discussed in section 5. Specifically, static magnonic crystals can be used as passive elements, like microwave filters, resonators or delay lines for microwave generation. Reconfigurable and dynamic magnonic crystals are promising as active devices performing, for example, tunable filtering, frequency conversion or time reversal. In the final section we briefly summarize the results. Magnon spintronics: from electron-to magnon-based computingA disturbance in the local magnetic order can propagate in a magnetic material in the form of a wave. This wave was first predicted by Bloch in 1929 and was named spin wave since AbstractMagnons (the quanta of spin waves) propagating in magnetic materials with wavelengths at the nanometer-scale and carrying information in the form of an angular momentum can be used as data carriers in next-generation, nano-sized low-loss information processing systems. In this respect, artificial magnetic materials with properties periodically varied in space, known as magnonic crystals, are especially promising for controlling and manipulating magnon currents. In this article, different approaches for the realization of static, reconfigurable, and dynamic magnonic crystals are presented along with a variety of novel wave phenomena discovered in these cryst...

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“…This exchange of the amplitudes is given by the susceptibility of the magnetization. For a thin film, the magnetization precesses on an elliptical trajectory with its semimajor axis in plane at resonance [41]. Far above resonance, the dominant magnetization component oscillates out of plane [31,32,34].…”

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confidence: 99%

Coherent THz Transient Spin Currents by Spin Pumping

Bocklage

2017

Phys. Rev. Lett.

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The generation of short spin current pulses is the basis for fast spintronic devices. In thin bilayer systems consisting of a nonmagnetic metal and a ferromagnet, a pure spin current is induced by a precessing magnetization into the nonmagnetic layer by spin pumping. This effect has been experimentally demonstrated at ferromagnetic resonance at GHz frequencies. Here, it is theoretically shown that transient magnetization dynamics efficiently generates short spin current pulses that exhibit two transient contributions. An effective coherent spin current generation is found far above the ferromagnetic resonance up to THz frequencies although dynamic magnetization amplitudes are very small in this regime. The results provide a concept for coherent THz spin current generation.

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Spin Precession Mapping at Ferromagnetic Resonance via Nuclear Resonant Scattering of Synchrotron Radiation

Cited by 13 publications

References 34 publications

Model of THz Magnetization Dynamics

Model of THz Magnetization Dynamics

Magnonic crystals for data processing

Coherent THz Transient Spin Currents by Spin Pumping

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