| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
2D Materials – Preparation, Properties, Modeling & Applications
|
| Presentation Title |
A New Phase of Silicon and Its Optical, Electrical, and Magnetic Properties |
| Author(s) |
Naveen Narasimhachar Joshi, Siba Sundar Sahoo, Roger Narayan, Jagdish Narayan |
| On-Site Speaker (Planned) |
Naveen Narasimhachar Joshi |
| Abstract Scope |
We report the outstanding optical, electrical, and magnetic properties in a new phase of silicon (Q-silicon) formed by nanosecond pulsed laser annealing of amorphous silicon. Through detailed structure-property correlations, we show that the bonding characteristics in Q-silicon are the same as crystalline silicon, but with a 60% higher atomic density. Consequently, Q-silicon is shown to have a narrow bandgap of 0.6 eV with the enhanced density of states near the Fermi level. Moreover, unlike crystalline silicon, Q-silicon exhibits ohmic behavior with a conductivity of 5.95 μScm-1. The isothermal field-dependent magnetization plots confirm room-temperature ferromagnetism in Q-silicon with a finite coercivity of ~ 100 Oe at 300 K. Furthermore, the blocking temperature estimated from the temperature-dependent magnetization plots is greater than 400 K, confirming the robust ferromagnetic interactions in Q-silicon. Thus, the discovery of exceptional functionalities in Q-silicon opens a new frontier for spin-based computing and atomic-level storage. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Magnetic Materials, Electronic Materials |