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Surface Recombination in Ultra-Fast Carrier Dynamics of Perovskite Oxide La0.7Sr0.3MnO3 Thin Films
- Source :
- ACS Nano. 13:3457-3465
- Publication Year :
- 2019
- Publisher :
- American Chemical Society (ACS), 2019.
-
Abstract
- Aspects of the optoelectronic performance of thin-film ferromagnetic materials are evaluated for application in ultrafast devices. Dynamics of photocarriers and their associated spin polarization are measured using transient reflectivity (TR) measurements in cross linear and circular polarization configurations for La0.7Sr0.3MnO3 films with a range of thicknesses. Three spin-related recombination mechanisms have been observed for thicker films (thickness of d ≥ 20 nm) at different time regimes (τ), which are attributed to the electron–phonon recombination (τ 1 ns). Density functional theory (DFT+U) based first-principles calculations provide information about the nature of the optical transitions and their probabilities for the majority and the minority spin channels. These transitions are partly responsible for the aforementioned recombination mechanisms, identified through the compari...
- Subjects :
- Materials science
Spin polarization
General Engineering
General Physics and Astronomy
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Molecular physics
0104 chemical sciences
Condensed Matter::Materials Science
Ferromagnetism
General Materials Science
Density functional theory
Thin film
0210 nano-technology
Spin (physics)
Circular polarization
Recombination
Perovskite (structure)
Subjects
Details
- ISSN :
- 1936086X and 19360851
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- ACS Nano
- Accession number :
- edsair.doi...........36f090e796c3f37132b11c51ef8a9696