Ultra-low Gilbert damping and self-induced inverse spin Hall effect in GdFeCo thin films

Jhantu Pradhan; M. S. Devapriya; Rohiteswar Mondal; Jun Uzuhashi; Tadakatsu Ohkubo; Shinya Kasai; Chandrasekhar Murapaka; Arabinda Haldar

doi:10.1063/5.0231132

論文 Ultra-low Gilbert damping and self-induced inverse spin Hall effect in GdFeCo thin films

Jhantu Pradhan ; M. S. Devapriya ; Rohiteswar Mondal ; Jun Uzuhashi ; Tadakatsu Ohkubo ; Shinya Kasai ; Chandrasekhar Murapaka ; Arabinda Haldar

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Jhantu Pradhan, M. S. Devapriya, Rohiteswar Mondal, Jun Uzuhashi, Tadakatsu Ohkubo, Shinya Kasai, Chandrasekhar Murapaka, Arabinda Haldar. Ultra-low Gilbert damping and self-induced inverse spin Hall effect in GdFeCo thin films. Journal of Applied Physics. 2024, 136 (20), . https://doi.org/10.1063/5.0231132

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