Ptychographic Nanoscale Imaging of the Magnetoelectric Coupling in Freestanding BiFeO 3 .

Autor: Butcher TA; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Phillips NW; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Chiu CC; Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan., Wei CC; Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan., Ho SZ; Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan., Chen YC; Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan., Fröjdh E; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Baruffaldi F; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Carulla M; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Zhang J; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Bergamaschi A; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Vaz CAF; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Kleibert A; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Finizio S; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Yang JC; Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan.; Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan, 70101, Taiwan., Huang SW; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland., Raabe J; Paul Scherrer Institut, Villigen PSI, 5232, Switzerland.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 Jun; Vol. 36 (23), pp. e2311157. Date of Electronic Publication: 2024 Mar 10.
DOI: 10.1002/adma.202311157
Abstrakt: Understanding the magnetic and ferroelectric ordering of magnetoelectric multiferroic materials at the nanoscale necessitates a versatile imaging method with high spatial resolution. Here, soft X-ray ptychography is employed to simultaneously image the ferroelectric and antiferromagnetic domains in an 80 nm thin freestanding film of the room-temperature multiferroic BiFeO 3 (BFO). The antiferromagnetic spin cycloid of period 64 nm is resolved by reconstructing the corresponding resonant elastic X-ray scattering in real space and visualized together with mosaic-like ferroelectric domains in a linear dichroic contrast image at the Fe L 3 edge. The measurements reveal a near perfect coupling between the antiferromagnetic and ferroelectric ordering by which the propagation direction of the spin cycloid is locked orthogonally to the ferroelectric polarization. In addition, the study evinces both a preference for in-plane propagation of the spin cycloid and changes of the ferroelectric polarization by 71° between multiferroic domains in the epitaxial strain-free, freestanding BFO film. The results provide a direct visualization of the strong magnetoelectric coupling in BFO and of its fine multiferroic domain structure, emphasizing the potential of ptychographic imaging for the study of multiferroics and non-collinear magnetic materials with soft X-rays.
(© 2024 The Authors. Advanced Materials published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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