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Antiferromagnetic textures in BiFeO 3 controlled by strain and electric field

Abstract : Antiferromagnetic thin films are currently generating considerable excitement for low dis-sipation magnonics and spintronics. However, while tuneable antiferromagnetic textures form the backbone of functional devices, they are virtually unknown at the submicron scale. Here we image a wide variety of antiferromagnetic spin textures in multiferroic BiFeO 3 thin films that can be tuned by strain and manipulated by electric fields through room-temperature magnetoelectric coupling. Using piezoresponse force microscopy and scanning NV magne-tometry in self-organized ferroelectric patterns of BiFeO 3 , we reveal how strain stabilizes different types of non-collinear antiferromagnetic states (bulk-like and exotic spin cycloids) as well as collinear antiferromagnetic textures. Beyond these local-scale observations, resonant elastic X-ray scattering confirms the existence of both types of spin cycloids. Finally, we show that electric-field control of the ferroelectric landscape induces transitions either between collinear and non-collinear states or between different cycloids, offering perspectives for the design of reconfigurable antiferromagnetic spin textures on demand.
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Submitted on : Thursday, July 30, 2020 - 4:03:15 PM
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A. Haykal, J. Fischer, W. Akhtar, J.-Y. Chauleau, D. Sando, et al.. Antiferromagnetic textures in BiFeO 3 controlled by strain and electric field. Nature Communications, Nature Publishing Group, 2020, 11 (1), ⟨10.1038/s41467-020-15501-8⟩. ⟨hal-02909544⟩

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