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Sergej O. Demokritov - One of the best experts on this subject based on the ideXlab platform.

  • route toward high speed nano magnonics provided by pure spin currents
    Applied Physics Letters, 2016
    Co-Authors: B Divinskiy, Sergej O. Demokritov, V E Demidov, A B Rinkevich, Sergei Urazhdin
    Abstract:

    We study experimentally the possibility to utilize pulses of pure spin current, produced via the nonlocal spin injection mechanism, to generate short packets of spin waves propagating in nanoscale magnetic waveguides. Spatially and time-resolved micro-focus Brillouin light scattering Spectroscopy measurements demonstrate that the excitation by spin current results in extremely fast transient response, enabling efficient generation of short spin-wave packets with duration down to a few nanoseconds. The proposed method opens a route for the implementation of high-speed magnonic systems for transmission and processing of information on the nanoscale.

  • spectral linewidth of spin current nano oscillators driven by nonlocal spin injection
    Applied Physics Letters, 2015
    Co-Authors: Vladislav E. Demidov, Sergei Urazhdi, A Rinkevich, Sergej O. Demokritov
    Abstract:

    We study experimentally the auto-oscillation characteristics of magnetic nano-oscillators driven by pure spin currents generated by nonlocal spin injection. By combining micro-focus Brillouin light scattering Spectroscopy with electronic microwave Spectroscopy, we are able to simultaneously perform both the spatial and the high-resolution spectral analyses of auto-oscillations induced by spin current. We find that the devices exhibit a highly coherent dynamics with the spectral linewidth of a few megahertz at room temperature. This narrow linewidth can be achieved over a wide range of operational frequencies, demonstrating a significant potential of nonlocal oscillators for applications.

  • magnonic waveguides studied by microfocus brillouin light scattering
    IEEE Transactions on Magnetics, 2015
    Co-Authors: V E Demidov, Sergej O. Demokritov
    Abstract:

    The paradigm of magnonics is based on utilization of propagating spin waves (or their quanta—magnons) for signal transmission and processing in magnetic-field-controlled devices. Implementation of magnonic devices for future-generation microelectronics requires the use of spin-wave guiding structures with micrometer- to nanometer-sized dimensions. Therefore, the deep understanding of propagation, excitation, and control of spin waves in microscopic waveguides is an absolute prerequisite for further developments in the field. Here we review recent experiments on spin-wave propagation in microscopic magnonic waveguides utilizing high-resolution Brillouin Light-Scattering Spectroscopy enabling 2-D visualization of spin waves on the nanoscale.

  • parametric excitation of eigenmodes in microscopic magnetic dots
    Physical Review B, 2011
    Co-Authors: Henning Ulrichs, Vladislav E. Demidov, Sergej O. Demokritov, Sergei Urazhdin
    Abstract:

    We utilize time- and space-resolved Brillouin light scattering Spectroscopy to study the parametric excitation of spin-wave eigenmodes in microscopic Permalloy dots. We show that the fundamental center eigenmode has the smallest excitation threshold. With the increase of the pumping power above this threshold, higher-order dipole-dominated eigenmodes with both even and odd spatial symmetry also become excited. At microwave power levels far above the threshold, the multimode excitation regime is suppressed due to the parametric excitation of short-wavelength exchange-dominated spin-wave modes. Our results provide important insight into the physics of parametric processes in microscopic magnetic systems.

  • excitation of short wavelength spin waves in magnonic waveguides
    Applied Physics Letters, 2011
    Co-Authors: V E Demidov, Mikhail Kostylev, Karsten Rott, Gunter Reiss, Jana Munchenberger, Sergej O. Demokritov
    Abstract:

    By using phase-resolved micro-focus Brillouin light scattering Spectroscopy, we demonstrate experimentally a phenomenon of wavelength conversion of spin waves propagating in tapered Permalloy waveguides. We show that this phenomenon enables efficient excitation of spin waves with sub-micrometer wavelengths being much smaller than the width of the microstrip antenna used for the excitation. The proposed excitation mechanism removes restrictions on the spin-wave wavelength imposed by the size of the antenna and enables improvement of performances of integrated magnonic devices.

Mikhail Kostylev - One of the best experts on this subject based on the ideXlab platform.

  • brillouin light scattering Spectroscopy of parametrically excited dipole exchange magnons
    Physical Review B, 2012
    Co-Authors: Alexander A. Serga, C W Sandweg, Matthias B Jungfleisch, Peter Kopietz, A. Kreisel, Burkard Hillebrands, Vitaliy I. Vasyuchka, Mikhail Kostylev
    Abstract:

    The spectral distribution of parametrically excited dipole-exchange magnons in an in-plane magnetized epitaxial film of yttrium-iron garnet was studied by means of frequency- and wavevector-resolved Brillouin light scattering Spectroscopy. The experiment was performed in a parallel pumping geometry where an exciting microwave magnetic field was parallel to the magnetizing field. It was found that for both dipolar and exchange spectral areas parallel pumping excites the lowest volume magnon modes propagating in the film plane perpendicularly to the magnetization direction. In order to interpret the experimental observations, we used a microscopic Heisenberg model that includes exchange as well as dipole-dipole interactions to calculate the magnon spectrum and construct the eigenstates. As proven in our calculations, the observed magnons are characterized by having the highest possible ellipticity of precession which suggests the lowest threshold of parametric generation. Applying different pumping powers we observe modifications in the magnon spectrum that are described theoretically by a softening of the spin stiffness.

  • brillouin light scattering Spectroscopy of parametrically excited dipole exchange magnons
    Physical Review B, 2012
    Co-Authors: Alexander A. Serga, C W Sandweg, Matthias B Jungfleisch, Peter Kopietz, A. Kreisel, Burkard Hillebrands, Vitaliy I. Vasyuchka, Mikhail Kostylev
    Abstract:

    The spectral distribution of parametrically excited dipole-exchange magnons in an in-plane magnetized epitaxial film of yttrium-iron garnet was studied by means of frequency- and wavevector-resolved Brillouin light scattering Spectroscopy. The experiment was performed in a parallel pumping geometry, where an exciting microwave magnetic field was parallel to the magnetizing field. It was found that for both dipolar and exchange spectral areas parallel pumping excites the lowest volume magnon modes propagating in the film plane perpendicularly to the magnetization direction. No excitation of the high-order volume modes has been registered. In order to interpret the experimental observations, we used a microscopic Heisenberg model that includes exchange as well as dipole-dipole interactions to calculate the magnon spectrum and construct the eigenstates. As proven in our calculations, the observed magnons are characterized by having the highest possible ellipticity of precession, which suggests the lowest threshold of parametric generation. Applying different pumping powers we observe modifications in the magnon spectrum that are described theoretically by a softening of the spin stiffness.

  • excitation of short wavelength spin waves in magnonic waveguides
    Applied Physics Letters, 2011
    Co-Authors: V E Demidov, Mikhail Kostylev, Karsten Rott, Gunter Reiss, Jana Munchenberger, Sergej O. Demokritov
    Abstract:

    By using phase-resolved micro-focus Brillouin light scattering Spectroscopy, we demonstrate experimentally a phenomenon of wavelength conversion of spin waves propagating in tapered Permalloy waveguides. We show that this phenomenon enables efficient excitation of spin waves with sub-micrometer wavelengths being much smaller than the width of the microstrip antenna used for the excitation. The proposed excitation mechanism removes restrictions on the spin-wave wavelength imposed by the size of the antenna and enables improvement of performances of integrated magnonic devices.

  • phase reciprocity of spin wave excitation by a microstrip antenna
    Physical Review B, 2008
    Co-Authors: T Schneider, Burkard Hillebrands, Alexander A. Serga, T Neumann, Mikhail Kostylev
    Abstract:

    Using space-, time-, and phase-resolved Brillouin Light-Scattering Spectroscopy we investigate the difference in phase of the two counterpropagating spin waves excited by the same microwave microstrip transducer. These studies are performed both for backward volume magnetostatic waves and magnetostatic surface waves in an in-plane magnetized yttrium iron garnet film. The experiments show that for the backward volume magnetostatic spin waves which are reciprocal and excited symmetrically in amplitude there is a phase difference of associated with the excitation process and thus the phase symmetry is distorted. On the contrary, for the magnetostatic surface spin waves which are nonreciprocal and unsymmetrical in amplitude the phase symmetry is preserved there is no phase difference between the two waves associated with the excitation. Theoretical analysis confirms this effect.

  • spin wave ferromagnetic film combiner as a not logic gate
    Journal of Nanoelectronics and Optoelectronics, 2008
    Co-Authors: T Schneider, Burkard Hillebrands, Alexander A. Serga, Mikhail Kostylev
    Abstract:

    An on-chip spin-wave combiner was fabricated by structuring a ferrimagnetic yttrium iron garnet film. Interference of magnetostatic spin-wave pulses in the combiner was studied using time and space resolve Brillouin light scattering Spectroscopy. This investigation demonstrates functionality of the combiner as a NOT logic gate. We believe that it is an important step towards implementation of all-spin-wave on-chip logical gates.

Matthias B Jungfleisch - One of the best experts on this subject based on the ideXlab platform.

  • large spin wave bullet in a ferrimagnetic insulator driven by the spin hall effect
    Physical Review Letters, 2016
    Co-Authors: Matthias B Jungfleisch, J Pearson, Houchen Chang, Wei Zhang, Wanjun Jiang, Joseph Sklenar, J Ding, F Y Fradin, J B Ketterson
    Abstract:

    Because of its transverse nature, spin Hall effects (SHE) provide the possibility to excite and detect spin currents and magnetization dynamics even in magnetic insulators. Magnetic insulators are outstanding materials for the investigation of nonlinear phenomena and for novel low power spintronics applications because of their extremely low Gilbert damping. Here, we report on the direct imaging of electrically driven spin-torque ferromagnetic resonance (ST-FMR) in the ferrimagnetic insulator Y_{3}Fe_{5}O_{12} based on the excitation and detection by SHEs. The driven spin dynamics in Y_{3}Fe_{5}O_{12} is directly imaged by spatially resolved microfocused Brillouin light scattering Spectroscopy. Previously, ST-FMR experiments assumed a uniform precession across the sample, which is not valid in our measurements. A strong spin-wave localization in the center of the sample is observed indicating the formation of a nonlinear, self-localized spin-wave "bullet".

  • all electrical detection of spin dynamics in magnetic antidot lattices by the inverse spin hall effect
    arXiv: Mesoscale and Nanoscale Physics, 2016
    Co-Authors: Matthias B Jungfleisch, J Pearson, Wei Zhang, Wanjun Jiang, Joseph Sklenar, J B Ketterson, J Ding, A Hoffmann
    Abstract:

    The understanding of spin dynamics in laterally confined structures on sub-micron length scales has become a significant aspect of the development of novel magnetic storage technologies. Numerous ferromagnetic resonance measurements, optical characterization by Kerr microscopy and Brillouin light scattering Spectroscopy and x-ray studies were carried out to detect the dynamics in patterned magnetic antidot lattices. Here, we investigate Oersted-field driven spin dynamics in rectangular Ni80Fe20/Pt antidot lattices with different lattice parameters by electrical means and compare them to micromagnetic simulations. When the system is driven to resonance, a dc voltage across the length of the sample is detected that changes its sign upon field reversal, which is in agreement with a rectification mechanism based on the inverse spin Hall effect. Furthermore, we show that the voltage output scales linearly with the applied microwave drive in the investigated range of powers. Our findings have direct implications on the development of engineered magnonics applications and devices.

  • spin transfer torque based damping control of parametrically excited spin waves in a magnetic insulator
    Applied Physics Letters, 2016
    Co-Authors: Viktor Lauer, P. Pirro, Matthias B Jungfleisch, Alexander A. Serga, Vitaliy I. Vasyuchka, Thomas Bracher, Dmytro A Bozhko, M Agrawal, Yu V Kobljanskyj
    Abstract:

    The damping of spin waves parametrically excited in the magnetic insulator Yttrium Iron Garnet (YIG) is controlled by a dc current passed through an adjacent normal-metal film. The experiment is performed on a macroscopically sized YIG(100 nm)/Pt(10 nm) bilayer of 4 × 2 mm2 lateral dimensions. The spin-wave relaxation frequency is determined via the threshold of the parametric instability measured by Brillouin light scattering Spectroscopy. The application of a dc current to the Pt film leads to the formation of a spin-polarized electron current normal to the film plane due to the spin Hall effect. This spin current exerts a spin transfer torque in the YIG film and, thus, changes the spin-wave damping. Depending on the polarity of the applied dc current with respect to the magnetization direction, the damping can be increased or decreased. The magnitude of its variation is proportional to the applied current. A variation in the relaxation frequency of ±7.5% is achieved for an applied dc current density of...

  • spin waves in micro structured yttrium iron garnet nanometer thick films
    Journal of Applied Physics, 2015
    Co-Authors: Matthias B Jungfleisch, J Pearson, Houchen Chang, Wei Zhang, Wanjun Jiang, Joseph Sklenar, Anand Bhattacharya, J B Ketterson, A Hoffmann
    Abstract:

    We investigated the spin-wave propagation in a micro-structured yttrium iron garnet waveguide of 40 nm thickness. Utilizing spatially-resolved Brillouin light scattering microscopy, an exponential decay of the spin-wave amplitude of (10.06 ± 0.83) μm was observed. This leads to an estimated Gilbert damping constant of α=(8.79±0.73)×10−4, which is larger than damping values obtained through ferromagnetic resonance measurements in unstructured films. The theoretically calculated spatial interference of waveguide modes was compared to the spin-wave pattern observed experimentally by means of Brillouin light scattering Spectroscopy.

  • spin waves in micro structured yttrium iron garnet nanometer thick films
    arXiv: Mesoscale and Nanoscale Physics, 2014
    Co-Authors: Matthias B Jungfleisch, J Pearson, Houchen Chang, Wei Zhang, Wanjun Jiang, Joseph Sklenar, Anand Bhattacharya, J B Ketterson, A Hoffmann
    Abstract:

    We investigated the spin-wave propagation in a micro-structured yttrium iron garnet waveguide of $40$ nm thickness. Utilizing spatially-resolved Brillouin light scattering microscopy, an exponential decay of the spin-wave amplitude of $(10.06 \pm 0.83)$ $\mu$m was observed. This leads to an estimated Gilbert damping constant of $\alpha=(8.79\pm 0.73)\times 10^{-4}$, which is larger than damping values obtained through ferromagnetic resonance measurements in unstructured films. The theoretically calculated spatial interference of waveguide modes was compared to the spin-wave pattern observed experimentally by means of Brillouin light scattering Spectroscopy.

Alexander A. Serga - One of the best experts on this subject based on the ideXlab platform.

  • spin transfer torque based damping control of parametrically excited spin waves in a magnetic insulator
    Applied Physics Letters, 2016
    Co-Authors: Viktor Lauer, P. Pirro, Matthias B Jungfleisch, Alexander A. Serga, Vitaliy I. Vasyuchka, Thomas Bracher, Dmytro A Bozhko, M Agrawal, Yu V Kobljanskyj
    Abstract:

    The damping of spin waves parametrically excited in the magnetic insulator Yttrium Iron Garnet (YIG) is controlled by a dc current passed through an adjacent normal-metal film. The experiment is performed on a macroscopically sized YIG(100 nm)/Pt(10 nm) bilayer of 4 × 2 mm2 lateral dimensions. The spin-wave relaxation frequency is determined via the threshold of the parametric instability measured by Brillouin light scattering Spectroscopy. The application of a dc current to the Pt film leads to the formation of a spin-polarized electron current normal to the film plane due to the spin Hall effect. This spin current exerts a spin transfer torque in the YIG film and, thus, changes the spin-wave damping. Depending on the polarity of the applied dc current with respect to the magnetization direction, the damping can be increased or decreased. The magnitude of its variation is proportional to the applied current. A variation in the relaxation frequency of ±7.5% is achieved for an applied dc current density of...

  • brillouin light scattering Spectroscopy of parametrically excited dipole exchange magnons
    Physical Review B, 2012
    Co-Authors: Alexander A. Serga, C W Sandweg, Matthias B Jungfleisch, Peter Kopietz, A. Kreisel, Burkard Hillebrands, Vitaliy I. Vasyuchka, Mikhail Kostylev
    Abstract:

    The spectral distribution of parametrically excited dipole-exchange magnons in an in-plane magnetized epitaxial film of yttrium-iron garnet was studied by means of frequency- and wavevector-resolved Brillouin light scattering Spectroscopy. The experiment was performed in a parallel pumping geometry where an exciting microwave magnetic field was parallel to the magnetizing field. It was found that for both dipolar and exchange spectral areas parallel pumping excites the lowest volume magnon modes propagating in the film plane perpendicularly to the magnetization direction. In order to interpret the experimental observations, we used a microscopic Heisenberg model that includes exchange as well as dipole-dipole interactions to calculate the magnon spectrum and construct the eigenstates. As proven in our calculations, the observed magnons are characterized by having the highest possible ellipticity of precession which suggests the lowest threshold of parametric generation. Applying different pumping powers we observe modifications in the magnon spectrum that are described theoretically by a softening of the spin stiffness.

  • brillouin light scattering Spectroscopy of parametrically excited dipole exchange magnons
    Physical Review B, 2012
    Co-Authors: Alexander A. Serga, C W Sandweg, Matthias B Jungfleisch, Peter Kopietz, A. Kreisel, Burkard Hillebrands, Vitaliy I. Vasyuchka, Mikhail Kostylev
    Abstract:

    The spectral distribution of parametrically excited dipole-exchange magnons in an in-plane magnetized epitaxial film of yttrium-iron garnet was studied by means of frequency- and wavevector-resolved Brillouin light scattering Spectroscopy. The experiment was performed in a parallel pumping geometry, where an exciting microwave magnetic field was parallel to the magnetizing field. It was found that for both dipolar and exchange spectral areas parallel pumping excites the lowest volume magnon modes propagating in the film plane perpendicularly to the magnetization direction. No excitation of the high-order volume modes has been registered. In order to interpret the experimental observations, we used a microscopic Heisenberg model that includes exchange as well as dipole-dipole interactions to calculate the magnon spectrum and construct the eigenstates. As proven in our calculations, the observed magnons are characterized by having the highest possible ellipticity of precession, which suggests the lowest threshold of parametric generation. Applying different pumping powers we observe modifications in the magnon spectrum that are described theoretically by a softening of the spin stiffness.

  • wide range wavevector selectivity of magnon gases in brillouin light scattering Spectroscopy
    Review of Scientific Instruments, 2010
    Co-Authors: C W Sandweg, Matthias B Jungfleisch, A. Kreisel, Alexander A. Serga, Burkard Hillebrands, Vitaliy I. Vasyuchka, P Clausen, Helmut Schultheiss, Peter Kopietz
    Abstract:

    Brillouin light scattering Spectroscopy is a powerful technique for the study of fast magnetization dynamics with both frequency and wavevector resolutions. Here, we report on a distinct improvement of this spectroscopic technique toward two-dimensional wide-range wavevector selectivity in a backward scattering geometry. Spin-wave wavevectors oriented perpendicularly to the bias magnetic field are investigated by tilting the sample within the magnet gap. Wavevectors which are oriented parallel to the applied magnetic field are analyzed by turning the entire setup, including the magnet system. The setup features a wide selectivity of wavevectors up to 2.04×105 rad/cm for both orientations, and allows selecting and measuring wavevectors of dipole- and exchange-dominated spin waves of any orientation to the magnetization simultaneously.

  • wide range wavevector selectivity of magnon gases in brillouin light scattering Spectroscopy
    arXiv: Instrumentation and Detectors, 2010
    Co-Authors: C W Sandweg, Matthias B Jungfleisch, A. Kreisel, Alexander A. Serga, Burkard Hillebrands, Vitaliy I. Vasyuchka, P Clausen, Helmut Schultheiss, Peter Kopietz
    Abstract:

    Brillouin light scattering Spectroscopy is a powerful technique for the study of fast magnetization dynamics with both frequency- and wavevector resolution. Here, we report on a distinct improvement of this spectroscopic technique towards two-dimensional wide-range wavevector selectivity in a backward scattering geometry. Spin-wave wavevectors oriented perpendicular to the bias magnetic field are investigated by tilting the sample within the magnet gap. Wavevectors which are oriented parallel to the applied magnetic field are analyzed by turning the entire setup, including the magnet system. The setup features a wide selectivity of wavevectors up to 2.04\cdot 10E5 rad/cm for both orientations, and allows selecting and measuring wavevectors of dipole- and exchange-dominated spin waves of any orientation to the magnetization simultaneously.

Burkard Hillebrands - One of the best experts on this subject based on the ideXlab platform.

  • brillouin light scattering Spectroscopy of parametrically excited dipole exchange magnons
    Physical Review B, 2012
    Co-Authors: Alexander A. Serga, C W Sandweg, Matthias B Jungfleisch, Peter Kopietz, A. Kreisel, Burkard Hillebrands, Vitaliy I. Vasyuchka, Mikhail Kostylev
    Abstract:

    The spectral distribution of parametrically excited dipole-exchange magnons in an in-plane magnetized epitaxial film of yttrium-iron garnet was studied by means of frequency- and wavevector-resolved Brillouin light scattering Spectroscopy. The experiment was performed in a parallel pumping geometry, where an exciting microwave magnetic field was parallel to the magnetizing field. It was found that for both dipolar and exchange spectral areas parallel pumping excites the lowest volume magnon modes propagating in the film plane perpendicularly to the magnetization direction. No excitation of the high-order volume modes has been registered. In order to interpret the experimental observations, we used a microscopic Heisenberg model that includes exchange as well as dipole-dipole interactions to calculate the magnon spectrum and construct the eigenstates. As proven in our calculations, the observed magnons are characterized by having the highest possible ellipticity of precession, which suggests the lowest threshold of parametric generation. Applying different pumping powers we observe modifications in the magnon spectrum that are described theoretically by a softening of the spin stiffness.

  • brillouin light scattering Spectroscopy of parametrically excited dipole exchange magnons
    Physical Review B, 2012
    Co-Authors: Alexander A. Serga, C W Sandweg, Matthias B Jungfleisch, Peter Kopietz, A. Kreisel, Burkard Hillebrands, Vitaliy I. Vasyuchka, Mikhail Kostylev
    Abstract:

    The spectral distribution of parametrically excited dipole-exchange magnons in an in-plane magnetized epitaxial film of yttrium-iron garnet was studied by means of frequency- and wavevector-resolved Brillouin light scattering Spectroscopy. The experiment was performed in a parallel pumping geometry where an exciting microwave magnetic field was parallel to the magnetizing field. It was found that for both dipolar and exchange spectral areas parallel pumping excites the lowest volume magnon modes propagating in the film plane perpendicularly to the magnetization direction. In order to interpret the experimental observations, we used a microscopic Heisenberg model that includes exchange as well as dipole-dipole interactions to calculate the magnon spectrum and construct the eigenstates. As proven in our calculations, the observed magnons are characterized by having the highest possible ellipticity of precession which suggests the lowest threshold of parametric generation. Applying different pumping powers we observe modifications in the magnon spectrum that are described theoretically by a softening of the spin stiffness.

  • wide range wavevector selectivity of magnon gases in brillouin light scattering Spectroscopy
    Review of Scientific Instruments, 2010
    Co-Authors: C W Sandweg, Matthias B Jungfleisch, A. Kreisel, Alexander A. Serga, Burkard Hillebrands, Vitaliy I. Vasyuchka, P Clausen, Helmut Schultheiss, Peter Kopietz
    Abstract:

    Brillouin light scattering Spectroscopy is a powerful technique for the study of fast magnetization dynamics with both frequency and wavevector resolutions. Here, we report on a distinct improvement of this spectroscopic technique toward two-dimensional wide-range wavevector selectivity in a backward scattering geometry. Spin-wave wavevectors oriented perpendicularly to the bias magnetic field are investigated by tilting the sample within the magnet gap. Wavevectors which are oriented parallel to the applied magnetic field are analyzed by turning the entire setup, including the magnet system. The setup features a wide selectivity of wavevectors up to 2.04×105 rad/cm for both orientations, and allows selecting and measuring wavevectors of dipole- and exchange-dominated spin waves of any orientation to the magnetization simultaneously.

  • wide range wavevector selectivity of magnon gases in brillouin light scattering Spectroscopy
    arXiv: Instrumentation and Detectors, 2010
    Co-Authors: C W Sandweg, Matthias B Jungfleisch, A. Kreisel, Alexander A. Serga, Burkard Hillebrands, Vitaliy I. Vasyuchka, P Clausen, Helmut Schultheiss, Peter Kopietz
    Abstract:

    Brillouin light scattering Spectroscopy is a powerful technique for the study of fast magnetization dynamics with both frequency- and wavevector resolution. Here, we report on a distinct improvement of this spectroscopic technique towards two-dimensional wide-range wavevector selectivity in a backward scattering geometry. Spin-wave wavevectors oriented perpendicular to the bias magnetic field are investigated by tilting the sample within the magnet gap. Wavevectors which are oriented parallel to the applied magnetic field are analyzed by turning the entire setup, including the magnet system. The setup features a wide selectivity of wavevectors up to 2.04\cdot 10E5 rad/cm for both orientations, and allows selecting and measuring wavevectors of dipole- and exchange-dominated spin waves of any orientation to the magnetization simultaneously.

  • an eom assisted wave vector resolving brillouin light scattering setup
    arXiv: Other Condensed Matter, 2009
    Co-Authors: T Neumann, Alexander A. Serga, T Schneider, Burkard Hillebrands
    Abstract:

    Brillouin light scattering Spectroscopy is a powerful technique which incorporates several extensions such as space-, time-, phase- and wave-vector resolution. Here, we report on the improvement of the wave-vector resolution by including an electro-optical modulator. This provides a reference to calibrate the position of the diaphragm hole which is used for wave-vector selection. The accuracy of this calibration is only limited by the accuracy of the wave-vector measurement itself. To demonstrate the validity of the approach the wave vectors of dipole-dominated spin waves excited by a microstrip antenna were measured.