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

Autor(en)

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

Abstrakt

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.

Organisation(en)

Nanomagnetismus und Magnonik

Externe Organisation(en)

Technische Universität Kaiserslautern, Johannes Gutenberg-Universität Mainz, Taras Shevchenko National University of Kyiv (KNU), Innovent e.V. Technologieentwicklung Jena

Journal

Applied Physics Letters

Band

120

Anzahl der Seiten

5

ISSN

0003-6951

DOI

https://doi.org/10.1063/5.0082724

Publikationsdatum

03-2022

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus, 103018 Materialphysik, 103008 Experimentalphysik

Schlagwörter

ASJC Scopus Sachgebiete

Physics and Astronomy (miscellaneous)

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/aaa0baf6-7532-4598-81ea-0cbf415f8e0d