Fast long-wavelength exchange spin waves in partially-compensated Ga:YIG

T. Böttcher; M. Ruhwedel; K. O. Levchenko; Q. Wang; H. L. Chumak; M. A. Popov; I. V. Zavislyak; Carsten Dubs; O. Surzhenko; Burkard Hillebrands; A. V. Chumak; Philipp Pirro

doi:10.1063/5.0082724

Fast long-wavelength exchange spin waves in partially-compensated Ga:YIG

T. Böttcher
, M. Ruhwedel
, K. O. Levchenko
, Q. Wang
, H. L. Chumak
, M. A. Popov
, I. V. Zavislyak
, Carsten Dubs
, O. Surzhenko
, Burkard Hillebrands
, A. V. Chumak
, Philipp Pirro (Corresponding author)

Nanomagnetism and Magnonics

Publications: Contribution to journal › Article › Peer Reviewed

Abstract

Spin waves in yttrium iron garnet (YIG) nano-structures attract increasing attention from the perspective of novel magnon-based data processing applications. For short wavelengths needed in small-scale devices, the group velocity is directly proportional to the spin-wave exchange stiffness constant ⁠. Using wave vector resolved Brillouin light scattering spectroscopy, we directly measure in Ga-substituted YIG thin films and show that it is about three times larger than for pure YIG. Consequently, the spin-wave group velocity overcomes the one in pure YIG for wavenumbers k > 4 rad/μm, and the ratio between the velocities reaches a constant value of around 3.4 for all k > 20 rad/μm. As revealed by vibrating-sample magnetometry and ferromagnetic resonance spectroscopy, Ga:YIG films with thicknesses down to 59 nm have a low Gilbert damping (⁠⁠), a decreased saturation magnetization mT, and a pronounced out-of-plane uniaxial anisotropy of about mT, which leads to an out-of-plane easy axis. Thus, Ga:YIG opens access to fast and isotropic spin-wave transport for all wavelengths in nano-scale systems independently of dipolar effects.

Original language	English
Article number	102401
Number of pages	5
Journal	Applied Physics Letters
Volume	120
Issue number	10
DOIs	https://doi.org/10.1063/5.0082724
Publication status	Published - 7 Mar 2022

Funding

This research has been funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)\u2014 No. 271741898, by the DFG Collaborative Research Center via No. SFB/TRR 173-268565370 (Project Nos. B01 and B11), by the Austrian Science Fund (FWF) through Project No. I 4696-N, and by the European Research Council project ERC Starting Magnon Circuits (Grant No. 678309). The authors thank Volodymyr Golub (Institute of Magnetism, National Academy of Sciences of Ukraine) for support and valuable discussions, as well as M. Lindner and T. Reimann for production of the YIG reference sample and R. Meyer (INNOVENT e.V.) for the technical assistance. AUTHOR DECLARATIONS Conflict of Interest The authors declare no competing interests. DATA AVAILABILITY The data that support the findings of this study are available from the corresponding author upon reasonable request.

Austrian Fields of Science 2012

103017 Magnetism
103018 Materials physics
103008 Experimental physics

Keywords

Applied physics
Condensed matter physics
Ferromagnetic resonance (FMR)
Brillouin light scattering
SATURATION MAGNETIZATION
GROWTH
FERROMAGNETIC-FILMS
SPECTRUM

Access to Document

10.1063/5.0082724Licence: CC BY 4.0

https://arxiv.org/abs/2112.11348

Cite this

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title = "Fast long-wavelength exchange spin waves in partially-compensated Ga:YIG",

abstract = "Spin waves in yttrium iron garnet (YIG) nano-structures attract increasing attention from the perspective of novel magnon-based data processing applications. For short wavelengths needed in small-scale devices, the group velocity is directly proportional to the spin-wave exchange stiffness constant ⁠. Using wave vector resolved Brillouin light scattering spectroscopy, we directly measure in Ga-substituted YIG thin films and show that it is about three times larger than for pure YIG. Consequently, the spin-wave group velocity overcomes the one in pure YIG for wavenumbers k > 4 rad/μm, and the ratio between the velocities reaches a constant value of around 3.4 for all k > 20 rad/μm. As revealed by vibrating-sample magnetometry and ferromagnetic resonance spectroscopy, Ga:YIG films with thicknesses down to 59 nm have a low Gilbert damping (⁠⁠), a decreased saturation magnetization mT, and a pronounced out-of-plane uniaxial anisotropy of about mT, which leads to an out-of-plane easy axis. Thus, Ga:YIG opens access to fast and isotropic spin-wave transport for all wavelengths in nano-scale systems independently of dipolar effects.",

keywords = "Applied physics, Condensed matter physics, Ferromagnetic resonance (FMR), Brillouin light scattering, SATURATION MAGNETIZATION, GROWTH, FERROMAGNETIC-FILMS, SPECTRUM",

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journal = "Applied Physics Letters",

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T1 - Fast long-wavelength exchange spin waves in partially-compensated Ga:YIG

AU - Böttcher, T.

AU - Ruhwedel, M.

AU - Levchenko, K. O.

AU - Wang, Q.

AU - Chumak, H. L.

AU - Popov, M. A.

AU - Zavislyak, I. V.

AU - Dubs, Carsten

AU - Surzhenko, O.

AU - Hillebrands, Burkard

AU - Chumak, A. V.

AU - Pirro, Philipp

PY - 2022/3/7

Y1 - 2022/3/7

N2 - Spin waves in yttrium iron garnet (YIG) nano-structures attract increasing attention from the perspective of novel magnon-based data processing applications. For short wavelengths needed in small-scale devices, the group velocity is directly proportional to the spin-wave exchange stiffness constant ⁠. Using wave vector resolved Brillouin light scattering spectroscopy, we directly measure in Ga-substituted YIG thin films and show that it is about three times larger than for pure YIG. Consequently, the spin-wave group velocity overcomes the one in pure YIG for wavenumbers k > 4 rad/μm, and the ratio between the velocities reaches a constant value of around 3.4 for all k > 20 rad/μm. As revealed by vibrating-sample magnetometry and ferromagnetic resonance spectroscopy, Ga:YIG films with thicknesses down to 59 nm have a low Gilbert damping (⁠⁠), a decreased saturation magnetization mT, and a pronounced out-of-plane uniaxial anisotropy of about mT, which leads to an out-of-plane easy axis. Thus, Ga:YIG opens access to fast and isotropic spin-wave transport for all wavelengths in nano-scale systems independently of dipolar effects.

AB - Spin waves in yttrium iron garnet (YIG) nano-structures attract increasing attention from the perspective of novel magnon-based data processing applications. For short wavelengths needed in small-scale devices, the group velocity is directly proportional to the spin-wave exchange stiffness constant ⁠. Using wave vector resolved Brillouin light scattering spectroscopy, we directly measure in Ga-substituted YIG thin films and show that it is about three times larger than for pure YIG. Consequently, the spin-wave group velocity overcomes the one in pure YIG for wavenumbers k > 4 rad/μm, and the ratio between the velocities reaches a constant value of around 3.4 for all k > 20 rad/μm. As revealed by vibrating-sample magnetometry and ferromagnetic resonance spectroscopy, Ga:YIG films with thicknesses down to 59 nm have a low Gilbert damping (⁠⁠), a decreased saturation magnetization mT, and a pronounced out-of-plane uniaxial anisotropy of about mT, which leads to an out-of-plane easy axis. Thus, Ga:YIG opens access to fast and isotropic spin-wave transport for all wavelengths in nano-scale systems independently of dipolar effects.

KW - Applied physics

KW - Condensed matter physics

KW - Ferromagnetic resonance (FMR)

KW - Brillouin light scattering

KW - SATURATION MAGNETIZATION

KW - GROWTH

KW - FERROMAGNETIC-FILMS

KW - SPECTRUM

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U2 - 10.1063/5.0082724

DO - 10.1063/5.0082724

M3 - Article

SN - 0003-6951

VL - 120

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 10

M1 - 102401

ER -

Fast long-wavelength exchange spin waves in partially-compensated Ga:YIG

Abstract

Funding

Austrian Fields of Science 2012

Keywords

Access to Document

Other files and links

Fingerprint

Functional layers of nm-thick YIG films and microstructures

MagnonCircuits: Nano-Scale Magnonic Circuits for Novel Computing Systems

Cite this

Fast long-wavelength exchange spin waves in partially-compensated Ga:YIG

Abstract

Funding

Austrian Fields of Science 2012

Keywords

Access to Document

Other files and links

Fingerprint

Projects

Functional layers of nm-thick YIG films and microstructures

MagnonCircuits: Nano-Scale Magnonic Circuits for Novel Computing Systems

Cite this