Parametric magnon-driven anisotropic spin pumping

We explore the effect of magnetic anisotropy on the interplay between spin current and parametric instability in magnetization dynamics, crucial for developing efficient nonlinear spintronics devices. The parametric instability is induced by the Suhl process where a uniform mode magnon excites two counter-propagating parametric magnons. We experimentally demonstrate direction-specific spin current generation via spin pumping from these parametrically excited magnons in a thin bilayer of [110]-oriented yttrium iron garnet and platinum (Pt), utilizing the facet-dependent magnetocrystalline anisotropy and magnetodipolar interaction. The facet-symmetry and the shape anisotropy modulate the magnonic dispersion relation as well as the magnon-scattering process which determines the spin pumping efficiency. Analyzing the in-plane angular dependence of spin pumping-induced inverse spin Hall effect voltage, we demonstrate anisotropic control of the spin pumping efficiency of the parametric magnons. Our findings provide critical insights to enhance control in magnonic logic devices.

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Publication Details

Journal
Applied Physics Letters
Published
2025-06-16
DOI
https://doi.org/10.1063/5.0263385
Primary Topic
Magnetic properties of thin films
Type
article
Field-Weighted Citation Impact
0.00

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Parametric magnon-driven anisotropic spin pumping

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Abstract

We explore the effect of magnetic anisotropy on the interplay between spin current and parametric instability in magnetization dynamics, crucial for developing efficient nonlinear spintronics devices. The parametric instability is induced by the Suhl process where a uniform mode magnon excites two counter-propagating parametric magnons. We experimentally demonstrate direction-specific spin current generation via spin pumping from these parametrically excited magnons in a thin bilayer of [110]-oriented yttrium iron garnet and platinum (Pt), utilizing the facet-dependent magnetocrystalline anisotropy and magnetodipolar interaction. The facet-symmetry and the shape anisotropy modulate the magnonic dispersion relation as well as the magnon-scattering process which determines the spin pumping efficiency. Analyzing the in-plane angular dependence of spin pumping-induced inverse spin Hall effect voltage, we demonstrate anisotropic control of the spin pumping efficiency of the parametric magnons. Our findings provide critical insights to enhance control in magnonic logic devices.

Applied Physics LettersVol. 126(24)
Motilal Nehru National Institute of Technology (IN), Forschungszentrum Jülich (DE), Nanyang Technological University (SG), Yamaguchi University (JP), Kyushu Institute of Technology (JP), Ernst Ruska Centre (DE), Indian Institute of Technology Kanpur (IN)
Japan Society for the Promotion of Science London, National Research Foundation Singapore, Ministry of Education - Singapore, Nanyang Technological University, Iketani Science and Technology Foundation, Science and Engineering Research Board
Openalex Percentile: Top 89%
Magnetic properties of thin films
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