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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.45: Poster
Thursday, September 8, 2022, 16:00–18:00, P4
Exchange Enhancement of Ferromagnetic Resonance in Mn2Au/Py — •Tobias Wagner and Olena Gomonay — Johannes Gutenberg-University Mainz, Germany
In the future, AFMs as active components will bring favourable advantages to spintronics: Robustness to external magnetic fields, temperature stability of the Néel ordered state and lack of stray fields. Therefore, AFMs are suitable for ultrafast and ultra high density spintronics. Recently, strong exchange coupling between Mn2Au and thin layers of Permalloy (Ni80Fe20) has been shown [1]. As a consequence, the coercive field of Mn2Au/Py was reported to be 5000 Oe, which is high compared to 200 Oe in CuMnAs/Fe [1]. High coercive fields lead to long term stability at room temperature. Due to strong exchange coupling, the AFM Néel vector and the FM magnetisation rotate coherently, when an external field is applied to the FM. Ferromagnetic resonance spectroscopy revealed two distinct frequencies for the coupled bilayer system, both of which lie above the resonance frequency of Permalloy. We model these findings using a phenomenological model. Our model enables us to demonstrate how the interfacial exchange coupling enables tuning of the ferromagnetic resonance frequency by variation of the thickness of the ferromagnetic layer.
References: [1] Bommanaboyena, S. P. et al., Nat. Comm. 12, 6539 (2021), [2] Al-Hamdo, H. et al., to be released (2022)