In a study published in NPJ Computational materials, researchers developed a method, SIPRAD, to accurately reconstruct the magnetic phase shift from a single Lorentz transmission electron microscopy image that outperforms previous techniques.
(a) Experimental LTEM image of magnetic bubbles in Cr₂Ge₂Te₆. (b, c) SIPRAD reconstructed magnetic phase shift and induction map.
Scientific Achievement
A new method, SIPRAD, was developed to reconstruct and isolate the magnetic phase shift from a single LTEM image.
Significance and Impact
SIPRAD enables qualitatively superior and quantitatively accurate phase reconstructions of time-resolved LTEM data, and the method is publicly available in the open-source software package PyLorentz.
Research Details
- Automatic differentiation and a deep image prior were used in conjunction with an LTEM forward model of image formation to reconstruct the electron phase shift while suppressing noise.
- A non-uniform amplitude or electrostatic phase shift induced by the sample can be accounted for, which allows the magnetic component of the phase shift to be effectively isolated.
- SIPRAD vastly outperforms previous methods in all cases and is especially suited to experimentally relevant imaging conditions.