About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
Investigate spin and lattice dynamics in transition metal oxides through neutron scattering |
| Author(s) |
Qiyang Sun, Yaokun Su, Dan Wang, Wei Tian, Douglas Abernathy, Chen Li |
| On-Site Speaker (Planned) |
Qiyang Sun |
| Abstract Scope |
Understanding spin-lattice dynamics in transition metal oxides is critical for next-generation spintronics. Using inelastic neutron scattering and first-principles calculations on Cr$_2O_3$ and α-Fe$_2O_3$ (hematite), we challenge existing theories and unveil novel magnetic phenomena.
For Cr$_2O_3$, we overturn the long-standing paradigm that dynamic spin-phonon coupling causes anomalous phonon stiffening. We demonstrate that this behavior is instead driven by the renormalization of electron states during the magnetic transition, establishing static magnetoelectric effects as the dominant origin. This finding prompts a re-evaluation of a foundational concept.
In the altermagnet α-Fe$_2O_3$, we provide the first definitive experimental evidence of chiral magnon band splitting. We trace its origin to alternating exchange interactions, providing fundamental insight needed to design and control spin transport in novel spintronic applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Modeling and Simulation, Phase Transformations |