| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure and Dynamics of Metallic Glasses
|
| Presentation Title |
Lorentz 4D-STEM: correlative imaging of magnetic & strain fields and atomic packing in metallic glasses |
| Author(s) |
Sangjun Kang, Di Wang, Xiaoke Mu, Christian Kuebel |
| On-Site Speaker (Planned) |
Christian Kuebel |
| Abstract Scope |
We have developed Lorentz 4-dimensional scanning transmission electron microscopy (Ltz-4D-STEM) for correlative mapping of the magnetic/electronic structure, strain fields, and relative packing density and pair distribution analysis in metallic glasses. A quasi-parallel electron probe is focused to 5-10 nm diameter on an electron transparent sample in field-free Lorentz mode. Using a 4D-STEM approach, 2D arrays of local diffraction patterns are recorded. We have developed an analysis approach considering the momentum transfer of the electron beam due to the local magnetic field, the elliptic distortion of the amorphous diffraction pattern under strain, and the area encompassed by the diffraction ring to quantify the relative atomic density and reveal their spatial-correlative variance. This enables not only a quantitative analysis of local shear distribution, short/medium ranger order, density and strain variations with high precision, but further allows for a direct pixel-level correlation of the magnetic/electric field and the atomic structure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Magnetic Materials, Other |