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Dynamic ferromagnetic proximity effect in photoexcited semiconductors
Gerrit E W Bauer1, Arne Brataas, Yaroslav Tserkovnyak
1Kavli Institute of NanoScience, Delft University of Technology, 2628 CJ Delft, The Netherlands.
Physical Review Letters
|April 20, 2004
Summary
This study explores spin dynamics in semiconductors coupled with ferromagnets. The research reveals that the initial picoseconds of interaction at the semiconductor-ferromagnet interface are crucial for understanding spin behavior.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Understanding spin dynamics in semiconductor-ferromagnet heterostructures is key for spintronic device development.
- The interface properties significantly influence carrier behavior and spin transport.
Purpose of the Study:
- To theoretically investigate the spin dynamics of photoexcited carriers in semiconductor-ferromagnet systems.
- To compare theoretical models with experimental time-dependent Faraday rotation data.
Main Methods:
- Theoretical treatment of spin dynamics.
- Analysis of time-dependent Faraday rotation experiments.
- Investigation of carrier-plasma interaction at the semiconductor-ferromagnet interface.
Main Results:
- The long-time spin response is dominated by interactions within the first tens of picoseconds.
- Strong interaction occurs at the intrinsic semiconductor-ferromagnet interface, even with a Schottky barrier.
- Photoexcited carrier dynamics play a critical role.
Conclusions:
- The initial picoseconds are critical for spin dynamics in these systems.
- Interface properties are vital, overriding equilibrium barrier effects in the short term.
- This work provides insights into spin injection and relaxation mechanisms.