BaFe11TiO19 Vortex EMCD
Type of the data | Dataset | |
Total size of the dataset | 241000046 | |
Author | Pohl, Darius | |
Author | Makino, Hitoshi | |
Author | Ernst, Arthur | |
Author | Negi, Devendra | |
Author | Schneider, Sebastian | |
Author | Erni, Rolf | |
Author | Rusz, Jan | |
Upload date | 2026-01-08T15:07:50Z | |
Publication date | 2026-01-08T15:07:50Z | |
Publication date | 2026-01-08 | |
Abstract of the dataset | We demonstrate atomic-scale mapping of local magnetic moments and doping effects in Ti-doped barium hexaferrite (BaFe11TiO19) using atom-sized electron vortex beams (EVBs) with controlled orbital angular momentum (OAM) in a scanning transmission electron microscope. By measuring electron energy loss magnetic circular dichroism (EMCD) at the Fe − L2,3 edges, we directly resolve the spatial distribution of antiparallel-aligned magnetic sublattices and quantify the impact of non-magnetic Ti4+ substitution. The EMCD signal, detected from single atomic Fe columns, reveals a marked reduction and sign reversal in the magnetic moment at Ti-rich 4f2 sites, corroborated by inelastic scattering simulations and density functional theory calculations that indicate induced Fe2+ formation and modified exchange interactions. Our results show that EVBs enable direct, element-specific, and atomically resolved magnetic characterization, opening new avenues for investigating local magnetic phenomena and dopant effects in nano-structured magnetic materials, such as those used in spintronic devices. This method paves the way for detailed studies of complex spin textures, magnetic interfaces, and dynamic processes at the atomic scale. Dataset includes raw data, DFT simulation of the DOS (BaFe12O19, BaFe11TiO19) and inelastic scattering simulation data. | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/1931 | |
Public reference to this page | https://doi.org/10.25532/OPARA-1059 | |
Publisher | Technische Universität Dresden | |
Licence | Attribution-NonCommercial 4.0 International | en |
URI of the licence text | http://creativecommons.org/licenses/by-nc/4.0/ | |
Specification of the discipline(s) | 3::32::307::307-01 | |
Title of the dataset | BaFe11TiO19 Vortex EMCD | |
Research instruments | Titan Themis G2 60-300, operated at 300 kV, with a XFEG and a DCOR+ corrector, For the EEL spectra acquisition, a CEOS CEFID spectrometer 188 equipped with a DECTRIS ELA direct electron camera is used (dispersion of 0.2 eV/pixel) with a 189 collection semi-angle of 21.8 mrad. | |
Project abstract | Electron vortex beams (EVBs) carry a discrete orbital angular momentum (OAM), L, and are predicted to reveal electron energy loss magnetic chiral dichroism (EMCD) upon interacting with magnetic samples down to the atomic scale. However, proof-of-concept experiments so far failed since the weak magnetic signal is still hidden behind the poor signal-to-noise ratio (SNR) of the acquired spectra. Within this project we therefore seek to develop strategies to improve the SNR on the methodical side as well as on the materials side – both of which are essential for a successful proof-of-concept experiment. We anticipate to build a fundamental understanding of how electron vortex beams with high spatial coherence and purity can be generated and how different material properties impact on the SNR for the detection of an atomically resolved EMCD signal. | |
Funding Acknowledgement | A. E. acknowledges the funding by the Fonds zur Förderung der wissenschaftlichen Forschung (FWF) under Grant No. I 5384. J.R. acknowledges the support of the Swedish Research Council (grant no. 2021-03848), Olle Engkvist’s foundation (grant no. 214-0331), and Knut and Alice Wallenbergs’ foundation (grant no. 2022.0079). The simulations were enabled by resources provided by the National Academic Infrastructure for Supercomputing in Sweden (NAISS) at PDC Centre partially funded by the Swedish Research Council through grant agreement no. 2022-06725. D.P. and H.M. are thankful for funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) grant no. 04660779. S.S. is thankful for funding by Deutsche Forschungsgemeinschaft within TRR 404 Active-3D (project number: 528378584). | |
Project title | Atomically resolved EMCD on ferrimagnets measured with electron vortex beams |
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