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Coherent Oscillations in a SrRuO3/BiFeO3 Superlattice
Fardiman Ruli1, Houssny Bouyanfif2, Kyungwan Kim1
1Department of Physics, Chungbuk National University, Cheongju 28644, Chungbuk, Republic of Korea.
We studied ultrafast dynamics in SrRuO3/BiFeO3 superlattices. Magnetostriction in SrRuO3 suppresses lattice expansion, reducing phonon oscillation amplitude in the ferromagnetic state.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Ultrafast Spectroscopy
Background:
- SrRuO3/BiFeO3 superlattices exhibit ferromagnetic order.
- Understanding ultrafast dynamics in such heterostructures is crucial for novel electronic applications.
Purpose of the Study:
- To investigate the ultrafast dynamics of SrRuO3/BiFeO3 superlattices.
- To explore the influence of temperature and magnetic ordering on lattice dynamics.
Main Methods:
- Near-infrared pump-probe spectroscopy at variable temperatures.
- Analysis of pump-induced reflectivity changes and periodic oscillations.
Main Results:
- Observed periodic oscillations attributed to zone-folded acoustic phonon oscillations (A1 mode).
- Oscillation frequency depends on supercell parameters (sound velocity, density, thickness).
- Oscillation amplitude is suppressed in the ferromagnetic state, proportional to M(T)^2.
Conclusions:
- Pump-induced expansion of SrRuO3 layer excites A1 phonon mode.
- Strong magnetostriction in SrRuO3 suppresses lattice expansion and oscillation amplitude in the ferromagnetic state.
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