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Ferrimagnetic materials have garnered significant attention due to their broad range of tunabilities and functionalities in spintronics applications. Among these materials, rare earth-transition metal GdFeCo alloy films have been the subject of intensive investigation due to their spin-dependent transport properties and strong spin-orbit coupling. In this report, we present self-induced spin-to-charge conversion in single-layer GdFeCo films of different thicknesses via inverse spin Hall effect. A detailed investigation of spin dynamics was carried out using broadband ferromagnetic resonance measurements. The anisotropy constant and the effective g-factor are found to decrease with thickness, and they become nearly constant for thicknesses beyond 25 nm. A remarkably low damping constant of 0.0029±0.0003 is obtained in the 43-nm-thick film, which is the lowest among all previous reports on GdFeCo thin films. Furthermore, we have demonstrated self-induced inverse spin Hall effect, which has not reported so far in a single-layer of GdFeCo thin film. Our analysis shows that the inverse spin Hall effect becomes increasingly dominant over the spin rectification effect with increasing film thickness. The in-plane angular-dependent voltage measurement of the 43-nm-thick film reveals a spin pumping voltage of 1.64 µV. The observation of spin-to-charge current conversion is attributed to the presence of high spin-orbit coupling element Gd in the film as well as co-existence of mixed phases (nanocrystalline and amorphous) in our films. Our findings underscore the potential of GdFeCo as a prime ferrimagnetic material for emerging spintronic technologies.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

  Copyright 2024 Author(s). This article is distributed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC BY-NC-ND) License.

Keyword: spintronics, ferrimagnet, inverse spin Hall effect

Date published: 2024-11-28

Publisher: AIP Publishing

Journal:

• Journal of Applied Physics (ISSN: 00218979) vol. 136 issue. 20

Funding:

• Board of Research in Nuclear Sciences 59/20/05/2021-BRNS
• Science and Engineering Research Board CRG/2022/005472
• Council of Scientific and Industrial Research, India 09/1001(0095)/2021-EMR-I
• Japan Society for the Promotion of Science JP24K00952

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5230

First published URL: https://doi.org/10.1063/5.0231132

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Updated at: 2024-12-27 16:31:01 +0900

Published on MDR: 2024-12-28 08:30:41 +0900