David Breitbach

Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau

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Philipp Pirro

University of Kaiserslautern

Björn Heinz

University of Kaiserslautern

B. Lägel

Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau

Carsten Dubs

Innovent

T. Brächer

University of Kaiserslautern

Andrii V. Chumak

University of Vienna

Qi Wang

Huazhong University of Science and Technology

Michael Schneider

University of Kaiserslautern

B. Hillebrands

University of Kaiserslautern

A. N. Slavin

Oakland University

Cooperative Institutions

University of Kaiserslautern

Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau

Politecnico di Milano

University of Koblenz and Landau

University of Vienna

Centre National de la Recherche Scientifique

Daimler (Germany)

Tohoku University

Mylan (Switzerland)

Taras Shevchenko National University of Kyiv

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Propagation of Spin-Wave Packets in Individual Nanosized Yttrium Iron Garnet Magnonic Conduits

Nano Letters (2020)

Björn Heinz T. Brächer Michael Schneider Qi Wang B. Lägel

Modern-day CMOS-based computation technology is reaching its fundamental limitations. The emerging field of magnonics, which utilizes spin waves for data transport and processing, proposes a promising path to overcome these limitations. Different devices have been demonstrated recently on the macro- and microscale, but the feasibility of the magnonics approach essentially relies on the scalability of the structure feature size down to the extent of a few 10 nm, which are typical sizes for the established CMOS technology. Here, we present a study of propagating spin-wave packets in individual yttrium iron garnet (YIG) conduits with lateral dimensions down to 50 nm. Space and time-resolved microfocused Brillouin-light-scattering (BLS) spectroscopy is used to characterize the YIG nanostructures and measure the spin-wave decay length and group velocity directly. The revealed magnon transport at the scale comparable to the scale of CMOS proves the general feasibility of magnon-based data processing.

Magnonics

Yttrium Iron Garnet

Spin wave

Magnon

Microscale chemistry

10.1021/acs.nanolett.0c00657

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Citations (99)

Hybrid magnonic-oscillator system

Journal of Applied Physics (2022)

A. Hamadeh David Breitbach Milan Ender A. Koujok Morteza Mohseni

We propose a hybrid magnonic-oscillator system based on the combination of a spin transfer auto-oscillator and a magnonic waveguide to open new perspectives for spin-wave based circuits. The system is composed of a spin transfer oscillator based on a vortex state which is dipolarly coupled to a nanoscale spin-wave waveguide with longitudinal magnetization. In its auto-oscillating regime, the oscillator emits coherent spin waves with tunable and controllable frequencies, directions, and amplitudes into the waveguide. We demonstrate the principle of this method using micromagnetic simulations and show that reconfiguration of the system is possible by changing the chirality and polarity of the magnetic vortex. Spin waves are emitted into the waveguide with high non-reciprocity and the preferred direction depends on the core polarity of the vortex. In contrast, different vortex chiralities lead to different amplitudes of the emitted waves. Our findings open up a novel way to design an agile spintronic device for the coherent and tunable generation of propagating spin waves.

Magnonics

Spin wave

Waveguide

Micromagnetics

Magnon

Backward-wave oscillator

10.1063/5.0123471

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Citations (8)

Stimulated amplification of propagating spin waves

arXiv (Cornell University) (2022)

David Breitbach Michael Schneider Björn Heinz Felix Kohl J. Maskill

Spin-wave amplification techniques are key to the realization of magnon-based computing concepts. We introduce a novel mechanism to amplify spin waves in magnonic nanostructures. Using the technique of rapid cooling, we create a non-equilibrium state in excess of high-energy magnons and demonstrate the stimulated amplification of an externally seeded, propagating spin wave. Using an extended kinetic model, we qualitatively show that the amplification is mediated by an effective energy flux of high energy magnons into the low energy propagating mode, driven by a non-equilibrium magnon distribution.

Magnon

Spin wave

Realization (probability)

Energy flux

10.48550/arxiv.2208.11455

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Citations (0)

Stabilization of a nonlinear magnonic bullet coexisting with a Bose-Einstein condensate in a rapidly cooled magnonic system driven by spin-orbit torque

Physical review. B./Physical review. B (2021)

Michael Schneider David Breitbach Rostyslav O. Serha Qi Wang Morteza Mohseni

We have recently shown that injection of magnons into a magnetic dielectric via the spin-orbit torque (SOT) effect in the adjacent layer of a heavy metal subjected to the action of short (0.1 $\mu$s) current pulses allows for control of a magnon Bose-Einstein Condensate (BEC). Here, the BEC was formed in the process of rapid cooling (RC), when the electric current heating the sample is abruptly terminated. In the present study, we show that the application of a longer (1.0 $\mu$s) electric current pulse triggers the formation of a nonlinear localized magnonic bullet below the linear magnon spectrum. After pulse termination, the magnon BEC, as before, is formed at the bottom of the linear spectrum, but the nonlinear bullet continues to exist, stabilized for additional 30 ns by the same process of RC-induced magnon condensation. Our results suggest that a stimulated condensation of excess magnons to all highly populated magnonic states occurs.

Magnon

10.1103/physrevb.104.l140405

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Citations (7)

Stabilization of a nonlinear bullet coexisting with a Bose-Einstein condensate in a rapidly cooled magnonic system driven by a spin-orbit torque

arXiv (Cornell University) (2021)

Michael Schneider David Breitbach Rostyslav O. Serha Qi Wang Morteza Mohseni

Magnon

Source

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Citations (0)

Control of the Bose-Einstein Condensation of Magnons by the Spin-Hall Effect

arXiv (Cornell University) (2021)

Michael Schneider David Breitbach Rostyslav O. Serha Qi Wang A. A. Serga

Previously, it has been shown that rapid cooling of yttrium-iron-garnet/platinum (Pt) nano structures, preheated by an electric current sent through the Pt layer leads to overpopulation of a magnon gas and to subsequent formation of a Bose-Einstein condensate (BEC) of magnons. The spin Hall effect (SHE), which creates a spin-polarized current in the Pt layer, can inject or annihilate magnons depending on the electric current and applied field orientations. Here we demonstrate that the injection or annihilation of magnons via the SHE can prevent or promote the formation of a rapid cooling induced magnon BEC. Depending on the current polarity, a change in the BEC threshold of -8% and +6% was detected. These findings demonstrate a new method to control macroscopic quantum states, paving the way for their application in spintronic devices.

Magnon

Yttrium Iron Garnet

Source

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Citations (2)

Three-dimensional nanoscale control of magnetism in crystalline Yttrium Iron Garnet

arXiv (Cornell University) (2024)

Valerio Levati Matteo Vitali Andrea Del Giacco Nicola Pellizzi Raffaele Silvani

The exceptional magnetic, optical and phononic properties of Yttrium Iron Garnet (YIG) make it unique for spin-wave based and photonic applications. Yet, nanostructuring crystalline YIG and manipulating its magnetism in a non-destructive way is an outstanding challenge, and so far mostly limited to two-dimensional capabilities. Here, we show that irradiation of single-crystal YIG films with a focused UV laser drives a stable, giant enhancement of the perpendicular magnetic anisotropy, preserving the crystalline quality. This modulation is highly confined at the nanoscale in both the lateral and vertical directions, and its extension within the volume can be finely tuned with a continuous depth-control. By harnessing these three-dimensional anisotropy profiles, we demonstrate a large tuning of the spin-wave band structure, volume spatial localization, and non-reciprocity, realizing proof-of-principle 3D magnonic crystals. This straightforward, single-step, laser nanofabrication of three-dimensional magnetic systems based on crystalline YIG thin films opens the way to design novel functions in magnonic and magneto-optic devices.

Magnetism

Yttrium Iron Garnet

10.48550/arxiv.2409.17722

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Citations (0)

Propagation of coherent spin waves in individual nano-sized yttrium iron garnet magnonic conduits

arXiv (Cornell University) (2019)

Björn Heinz T. Brächer Michael Schneider Wang Qi B. Lägel

Modern-days CMOS-based computation technology is reaching its fundamental limitations. The emerging field of magnonics, which utilizes spin waves for data transport and processing, proposes a promising path to overcome these limitations. Different devices have been demonstrated recently on the macro- and microscale, but the feasibility of the magnonics approach essentially relies on the scalability of the structure feature size down to an extent of a few 10 nm, which are typical sizes for the established CMOS technology. Here, we present a study of propagating spin-wave packets in individual yttrium iron garnet (YIG) conduits with lateral dimensions down to 50 nm. Space and time resolved micro-focused Brillouin-Light-Scattering (BLS) spectroscopy is used to characterize the YIG nanostructures and measure the spin-wave decay length and group velocity directly. The revealed magnon transport at the scale comparable to the scale of CMOS proves the general feasibility of a magnon-based data processing.

Magnonics

Yttrium Iron Garnet

Spin wave

Magnon

Microscale chemistry

Source

Cite

Citations (2)

Stimulated Amplification of Propagating Spin Waves

Physical Review Letters (2023)

David Breitbach Michael Schneider Björn Heinz Felix Kohl J. Maskill

Spin-wave amplification techniques are key to the realization of magnon-based computing concepts. We introduce a novel mechanism to amplify spin waves in magnonic nanostructures. Using the technique of rapid cooling, we create a nonequilibrium state in excess of high-energy magnons and demonstrate the stimulated amplification of an externally seeded, propagating spin wave. Using an extended kinetic model, we qualitatively show that the amplification is mediated by an effective energy flux of high energy magnons into the low energy propagating mode, driven by a nonequilibrium magnon distribution.

Magnon

Spin wave

Realization (probability)

Energy flux

10.1103/physrevlett.131.156701

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Citations (11)

Bose–Einstein condensation of quasiparticles by rapid cooling

Nature Nanotechnology (2020)

Michael Schneider T. Brächer David Breitbach V. Lauer Philipp Pirro

Magnon

10.1038/s41565-020-0671-z

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Citations (37)