Investigating the Interplay between Spin-Polarization and MagneticDamping in CoxFe80−xB20 for Magnonics Applications

Lorenzo Gnoatto; Thomas Molier; Jelte J. Lamberts; Artim L. Bassant; Casper F. Schippers; Rembert A. Duine; Reinoud Lavrijsen

doi:10.1063/5.0254050

Investigating the Interplay between Spin-Polarization and MagneticDamping in CoxFe80−xB20 for Magnonics Applications

Lorenzo Gnoatto (Corresponding author)
, Thomas Molier
, Jelte J. Lamberts
, Artim L. Bassant
, Casper F. Schippers
, Rembert A. Duine
, Reinoud Lavrijsen

Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review

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For magnonics and spintronics applications, the spin polarization (P) of a transport current and the magnetic damping ( α ) play a crucial role, e.g., for magnetization dynamics and magnetization switching applications. In particular, P in a glassy (amorphous) 3d transition ferromagnet such as CoFeB and α are both strongly affected by s − d scattering mechanisms. Hence, a correlation can be expected, which is a priori difficult to predict. In this work, P and α are measured using current-induced Doppler shifts using propagating spin wave spectroscopy and broadband ferromagnetic resonance techniques in blanket films and current-carrying Co _xFe _80−xB ₂₀ alloy microstrips. The measured P ranges from 0.18 ± 0.05 to 0.39 ± 0.05, and α ranges from ( 4.0 ± 0.2 ) · 10 ₋₃ to ( 9.7 ± 0.6 ) · 10 ₋₃. We find that for increasing P, a systematic drop in α is observed, indicating an interplay between magnetic damping and the spin polarization of the transport current, which suggests that interband scattering dominates in Co _xFe _80−xB ₂₀. Our results may guide future experiments, theory, and applications in advancing spintronics and metal magnonics.

Originele taal-2	Engels
Artikelnummer	072402
Aantal pagina's	4
Tijdschrift	Applied Physics Letters
Volume	126
Nummer van het tijdschrift	7
DOI's	https://doi.org/10.1063/5.0254050
Status	Gepubliceerd - 17 feb 2025

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We thank Paul Kelly for discussions on our data. This publication is a part of the project \u201CBlack holes on a chip\u201D (file No. OCENW.KLEIN.502) of the research program NWO Open Competitie ENW-KLEIN, funded by the Dutch Research Council (NWO).

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Supplementary material
Gnoatto, L. (Ontwerper), Molier, T. (Ontwerper), Lamberts, J. (Ontwerper), Bassant, A. (Ontwerper), Schippers, C. (Ontwerper), Duine, R. (Ontwerper) & Lavrijsen, R. (Ontwerper), AIP Publishing, 18 feb. 2025
DOI: 10.60893/figshare.apl.28352672
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title = "Investigating the Interplay between Spin-Polarization and MagneticDamping in CoxFe80−xB20 for Magnonics Applications",

abstract = "For magnonics and spintronics applications, the spin polarization (P) of a transport current and the magnetic damping ( α ) play a crucial role, e.g., for magnetization dynamics and magnetization switching applications. In particular, P in a glassy (amorphous) 3d transition ferromagnet such as CoFeB and α are both strongly affected by s − d scattering mechanisms. Hence, a correlation can be expected, which is a priori difficult to predict. In this work, P and α are measured using current-induced Doppler shifts using propagating spin wave spectroscopy and broadband ferromagnetic resonance techniques in blanket films and current-carrying Co xFe 80−xB 20 alloy microstrips. The measured P ranges from 0.18 ± 0.05 to 0.39 ± 0.05, and α ranges from ( 4.0 ± 0.2 ) · 10 −3 to ( 9.7 ± 0.6 ) · 10 −3. We find that for increasing P, a systematic drop in α is observed, indicating an interplay between magnetic damping and the spin polarization of the transport current, which suggests that interband scattering dominates in Co xFe 80−xB 20. Our results may guide future experiments, theory, and applications in advancing spintronics and metal magnonics.",

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AU - Gnoatto, Lorenzo

AU - Molier, Thomas

AU - Lamberts, Jelte J.

AU - Bassant, Artim L.

AU - Schippers, Casper F.

AU - Duine, Rembert A.

AU - Lavrijsen, Reinoud

PY - 2025/2/17

Y1 - 2025/2/17

N2 - For magnonics and spintronics applications, the spin polarization (P) of a transport current and the magnetic damping ( α ) play a crucial role, e.g., for magnetization dynamics and magnetization switching applications. In particular, P in a glassy (amorphous) 3d transition ferromagnet such as CoFeB and α are both strongly affected by s − d scattering mechanisms. Hence, a correlation can be expected, which is a priori difficult to predict. In this work, P and α are measured using current-induced Doppler shifts using propagating spin wave spectroscopy and broadband ferromagnetic resonance techniques in blanket films and current-carrying Co xFe 80−xB 20 alloy microstrips. The measured P ranges from 0.18 ± 0.05 to 0.39 ± 0.05, and α ranges from ( 4.0 ± 0.2 ) · 10 −3 to ( 9.7 ± 0.6 ) · 10 −3. We find that for increasing P, a systematic drop in α is observed, indicating an interplay between magnetic damping and the spin polarization of the transport current, which suggests that interband scattering dominates in Co xFe 80−xB 20. Our results may guide future experiments, theory, and applications in advancing spintronics and metal magnonics.

AB - For magnonics and spintronics applications, the spin polarization (P) of a transport current and the magnetic damping ( α ) play a crucial role, e.g., for magnetization dynamics and magnetization switching applications. In particular, P in a glassy (amorphous) 3d transition ferromagnet such as CoFeB and α are both strongly affected by s − d scattering mechanisms. Hence, a correlation can be expected, which is a priori difficult to predict. In this work, P and α are measured using current-induced Doppler shifts using propagating spin wave spectroscopy and broadband ferromagnetic resonance techniques in blanket films and current-carrying Co xFe 80−xB 20 alloy microstrips. The measured P ranges from 0.18 ± 0.05 to 0.39 ± 0.05, and α ranges from ( 4.0 ± 0.2 ) · 10 −3 to ( 9.7 ± 0.6 ) · 10 −3. We find that for increasing P, a systematic drop in α is observed, indicating an interplay between magnetic damping and the spin polarization of the transport current, which suggests that interband scattering dominates in Co xFe 80−xB 20. Our results may guide future experiments, theory, and applications in advancing spintronics and metal magnonics.

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Investigating the Interplay between Spin-Polarization and MagneticDamping in CoxFe80−xB20 for Magnonics Applications

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