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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 15: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)

KFM 15.10: Talk

Wednesday, March 20, 2024, 17:30–17:45, EB 407

Ptychographic imaging of multiferroic domains in freestanding BiFeO₃ films — •Tim A. Butcher¹, Nicholas W. Phillips¹, Chia-Chun Wei², Carlos A. F. Vaz¹, Armin Kleibert¹, Simone Finizio¹, Jan-Chi Yang^{2, 3}, Shih-Wen Huang¹, and Jörg Raabe¹ — ¹Paul Scherrer Institut, 5232 Villigen PSI, Switzerland — ²Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan — ³Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan 70101, Taiwan

The multiferroic domains in freestanding bismuth ferrite films were imaged with the synchrotron technique of soft X-ray ptychography, which can achieve a high spatial resolution in the order of 5 nm. The ferroelectric domains show a linear dichroic contrast at the Fe L₃ edge, while the antiferromagnetic spin cycloid was reconstructed from its diffraction peak under resonant scattering conditions. The results directly visualise the strong magnetoelectric coupling and the changes in the multiferroic domain patterns with varying film thickness.

Keywords: Bismuth Ferrite; Soft X-ray Ptychography; Multiferroic Domains; Synchrotron Techniques; Freestanding Films