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Ultrafast Laser-Induced Interatomic Forces in Magnetostrictive Metals.
Xiaoxue Zeng1, Lei Zhang1, Yu Huang2
1State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 24, 2025
Summary
Researchers observed ultrafast interatomic forces in FeGa thin films using femtosecond photoexcitation. This study reveals how electron redistribution influences interatomic forces and metal lattice dynamics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Ultrafast Phenomena
Background:
- Femtosecond photoexcitation drives nonequilibrium processes in solids.
- Ultrafast interatomic forces are crucial for material properties.
- Experimental data on these forces in metals are scarce.
Purpose of the Study:
- To directly observe femtosecond-scale photoinduced interatomic forces in FeGa thin films.
- To investigate the role of ultrafast demagnetization and magnetostriction.
- To bridge the gap in experimental studies of nonequilibrium dynamics in metals.
Main Methods:
- Femtosecond laser spectroscopy.
- Time-resolved optical measurements.
- Analysis of transient birefringence signals.
Main Results:
- Direct observation of femtosecond-scale interatomic forces in FeGa films.
- A transient signal (≈400 fs) linked to demagnetization and stress release.
- Signal orientation dependence on external magnetic field.
Conclusions:
- Photoinduced electron redistribution transiently distorts interatomic forces before lattice expansion.
- Magnetization-induced stress anisotropy influences interatomic potential.
- Findings offer insights into controlling metal lattice dynamics via ultrafast magnetostriction.
