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Interface phenomena in ferromagnet/TaO$_x$ -based systems: Damping, perpendicular magnetic anisotropy, and Dzyaloshinskii-Moriya interaction

Abstract : Microstrip line ferromagnetic resonance (MS-FMR) and Brillouin light scattering (BLS) in the Damon-Eshbach geometry were used to investigate the perpendicular magnetic anisotropy (PMA), the damping and the interfacial Dzyaloshinskii-Moriya (iDMI) interaction in ferromagnetic (FM)/TaO$_x$-based systems as a function of the ferromagnetic (FM = Co or Co$_8$Fe$_{72}$B$_{20}$) and the TaO$_x$ thicknesses (oxidation level). The analysis of the experimental FMR and BLS data has shown that the effective magnetization, the Gilbert damping parameter α and the iDMI are inversely proportional to the CoFeB and the Co films thickness. The BLS investigation of the iDMI variation versus the TaO$_x$ thickness and oxidation level reveals a contribution of FM/TaO$_x$ mediated by the presence of a Rashba field at this interface. Finally, we evidenced a correlation between iDMI and PMA by varying the Cu spacer thickness in the Pt/Cu/Co/TaO$_x$ system and we showed that both PMA and iDMI are localized at the first atomic monolayers of the Pt/Co interface. The observed non-linear dependence of PMA versus iDMI constant is attributed to similar interface orbital hybridizations involved in both quantities.
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https://hal.archives-ouvertes.fr/hal-03094037
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Submitted on : Tuesday, April 27, 2021 - 9:15:45 AM
Last modification on : Tuesday, September 14, 2021 - 8:24:02 PM

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I. Benguettat-El Mokhtari, Y. Roussigné, S. Chérif, A. Stashkevich, S. Auffret, et al.. Interface phenomena in ferromagnet/TaO$_x$ -based systems: Damping, perpendicular magnetic anisotropy, and Dzyaloshinskii-Moriya interaction. Physical Review Materials, American Physical Society, 2020, 4 (12), pp.124408. ⟨10.1103/PhysRevMaterials.4.124408⟩. ⟨hal-03094037⟩

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