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Dive into the research topics where B. Leven is active.

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Featured researches published by B. Leven.


Applied Physics Letters | 2008

Realization of spin-wave logic gates

T. Schneider; A. A. Serga; B. Leven; B. Hillebrands; R. L. Stamps; Mikhail Kostylev

We demonstrate the functionality of spin-wave logic exclusive-not-OR and not-AND gates based on a Mach-Zehnder-type interferometer which has arms implemented as sections of ferrite film spin-wave waveguides. Logical input signals are applied to the gates by varying either the phase or the amplitude of the spin waves in the interferometer arms. This phase or amplitude variation is produced by Oersted fields of dc current pulses through conductors placed on the surface of the magnetic films.


Applied Physics Letters | 2005

Spin-wave logical gates

Mikhail Kostylev; A. A. Serga; T. Schneider; B. Leven; B. Hillebrands

A universal approach to spin-wave logic gates is presented. The feasibility of a spin-wave based NOT gate has been demonstrated experimentally. We propose to use a Mach–Zender-type current-controlled interferometer based on spin-wave propagation in a ferromagnetic film to construct logical gates. We investigate the performance of the main element of such interferometric logical gates—the controlled phase shifter implemented as a spin-wave device.


Applied Physics Letters | 2009

Magnetic domain-wall motion by propagating spin waves

Dong-Soo Han; Sang-Koog Kim; Jun-Young Lee; S. J. Hermsdoerfer; Helmut Schultheiss; B. Leven; B. Hillebrands

We found by micromagnetic simulations that the motion of a transverse wall (TW)–type domain wall in magnetic thin-film nanostripes can be manipulated via interaction with spin waves (SWs) propagating through the TW. The velocity of the TW motion can be controlled by changes of the frequency and amplitude of the propagating SWs. Moreover, the TW motion is efficiently driven by specific SW frequencies that coincide with the resonant frequencies of the local modes existing inside the TW structure. The use of propagating SWs, whose frequencies are tuned to those of the intrinsic TW modes, is an alternative approach for controlling TW motion in nanostripes.


Applied Physics Letters | 2014

Design of a spin-wave majority gate employing mode selection

Stefan Klingler; P. Pirro; T. Brächer; B. Leven; B. Hillebrands; Andrii V. Chumak

The design of a microstructured, fully functional spin-wave majority gate is presented and studied using micromagnetic simulations. This all-magnon logic gate consists of three-input waveguides, a spin-wave combiner and an output waveguide. In order to ensure the functionality of the device, the output waveguide is designed to perform spin-wave mode selection. We demonstrate that the gate evaluates the majority of the input signals coded into the spin-wave phase. Moreover, the all-magnon data processing device is used to perform logic AND-, OR-, NAND- and NOR- operations.


Applied Physics Letters | 2014

Spin-wave excitation and propagation in microstructured waveguides of yttrium iron garnet/Pt bilayers

P. Pirro; T. Brächer; A. V. Chumak; B. Lägel; C. Dubs; Oleksii Surzhenko; P. Görnert; B. Leven; B. Hillebrands

We present an experimental study of spin-wave excitation and propagation in microstructured waveguides consisting of a 100 nm thick yttrium iron garnet/platinum (Pt) bilayer. The life time of the spin waves is found to be more than an order of magnitude higher than in comparably sized metallic structures, despite the fact that the Pt capping enhances the Gilbert damping. Utilizing microfocus Brillouin light scattering spectroscopy, we reveal the spin-wave mode structure for different excitation frequencies. An exponential spin-wave amplitude decay length of 31 μm is observed which is a significant step towards low damping, insulator based micro-magnonics.


Applied Physics Letters | 2007

Microwave assisted switching in a Ni81Fe19 ellipsoid

Hans T. Nembach; P. Martín Pimentel; S. J. Hermsdoerfer; B. Leven; B. Hillebrands; S. O. Demokritov

The authors demonstrate the stimulation of the magnetization switching process of a Ni81Fe19 ellipsoid, which is dominated by domain nucleation and propagation, by applying a transverse microwave field. The study of the quasistatic switching behavior under the influence of a microwave field was performed using longitudinal magneto-optic Kerr effect magnetometry. A strong reduction of the coercive field for microwave frequencies between 500 and 900MHz has been observed, which can be attributed to two different mechanisms: microwave stimulated enhancement of domain nucleation and microwave stimulated growth of the reversed domain. The authors prove that heating is not the origin of the reduction of the coercive field.


Applied Physics Letters | 2015

Spin-wave logic devices based on isotropic forward volume magnetostatic waves

Stefan Klingler; P. Pirro; T. Brächer; B. Leven; B. Hillebrands; Andrii V. Chumak

We propose the utilization of isotropic forward volume magnetostatic spin waves in modern wave-based logic devices and suggest a concrete design for a spin-wave majority gate operating with these waves. We demonstrate by numerical simulations that the proposed out-of-plane magnetized majority gate overcomes the limitations of anisotropic in-plane magnetized majority gates due to the high spin-wave transmission through the gate, which enables a reduced energy consumption of these devices. Moreover, the functionality of the out-of-plane majority gate is increased due to the lack of parasitic generation of short-wavelength exchange spin waves.


Physica Status Solidi B-basic Solid State Physics | 2011

Interference of coherent spin waves in micron-sized ferromagnetic waveguides

P. Pirro; T. Brächer; K. Vogt; Björn Obry; Helmut Schultheiss; B. Leven; B. Hillebrands

We present experimental observations of the interference of spin-wave modes propagating in opposite directions in micron-sized Ni81Fe19-waveguides. To monitor the local spin-wave intensity distribution and phase of the formed interference pattern, we use Brillouin light scattering microscopy. The two-dimensional spin-wave intensity map can be understood by considering the interference of several waveguide eigenmodes with different wavevectors quantized across the width of the stripe. The phase shows a transition from linear dependence on the space coordinate near the antennas characteristic for propagating waves to discrete values in the center region characteristic for standing waves.


Physical Review B | 2007

Resonant and nonresonant scattering of dipole-dominated spin waves from a region of inhomogeneous magnetic field in a ferromagnetic film

Mikhail Kostylev; A. A. Serga; T. Schneider; T. Neumann; B. Leven; B. Hillebrands; R. L. Stamps

The transmission of a dipole-dominated spin wave in a ferromagnetic film through a localised inhomogeneity in the form of a magnetic field produced by a dc current through a wire placed on the film surface was studied experimentally and theoretically. It was shown that the amplitude and phase of the transmitted wave can be simultaneously affected by the current induced field, a feature that will be relevant for logic based on spin wave transport. The direction of the current creates either a barrier or well for spin wave transmission. The main observation is that the current dependence of the amplitude of the spin wave transmitted through the well inhomogeneity is non-monotonic. The dependence has a minimum and an additional maximum. A theory was constructed to clarify the nature of the maximum. It shows that the transmission of spin waves through the inhomogeneity can be considered as a scattering process and that the additional maximum is a scattering resonance.


Applied Physics Letters | 2011

Mode conversion by symmetry breaking of propagating spin waves

P. Clausen; K. Vogt; Helmut Schultheiss; S. Schäfer; Björn Obry; Georg Wolf; P. Pirro; B. Leven; B. Hillebrands

We study spin-wave transport in a microstructured Ni81Fe19 waveguide exhibiting broken translational symmetry. We observe the conversion of a beam profile composed of symmetric spin-wave width modes with odd numbers of antinodes n = 1, 3,… into a mixed set of symmetric and asymmetric modes. Due to the spatial homogeneity of the exciting field along the used microstrip antenna, quantized spin-wave modes with an even number n of antinodes across the stripe’s width cannot be directly excited. We show that a break in translational symmetry may result in a partial conversion of even spin-wave waveguide modes.

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B. Hillebrands

Kaiserslautern University of Technology

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Helmut Schultheiss

Helmholtz-Zentrum Dresden-Rossendorf

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S. J. Hermsdoerfer

Kaiserslautern University of Technology

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A. A. Serga

Kaiserslautern University of Technology

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P. Pirro

Kaiserslautern University of Technology

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A. Conca

Kaiserslautern University of Technology

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P. Martín Pimentel

Kaiserslautern University of Technology

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Björn Obry

Kaiserslautern University of Technology

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Andrii V. Chumak

Kaiserslautern University of Technology

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