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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Ultrafast time-resolved faraday rotation in EuO thin films
1Quantum Phase Electronics Center and Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Physical Review Letters
|September 26, 2012
Summary
We observed transiently enhanced magnetization in Europium Oxide (EuO) thin films, driven by ultrafast spin dynamics. This enhancement, peaking near the Curie temperature, suggests a temporary collective ordering due to improved f-d exchange interactions.
Area of Science:
- Condensed matter physics
- Materials science
- Ultrafast spectroscopy
Background:
- Europium Oxide (EuO) is a magnetic semiconductor with potential applications in spintronics.
- Understanding its ultrafast spin dynamics is crucial for developing novel magnetic devices.
Purpose of the Study:
- To investigate the ultrafast spin dynamics in EuO thin films.
- To elucidate the mechanisms behind photoinduced magnetization changes.
Main Methods:
- Time-resolved Faraday rotation spectroscopy was employed.
- Measurements were conducted across a range of temperatures, particularly near the Curie temperature.
Main Results:
- A transient increase in photoinduced magnetization was observed, followed by demagnetization.
- Magnetization enhancement peaked below the Curie temperature, with prolonged tails at other temperatures.
- The enhancement component decayed within approximately 1 nanosecond and dominated at 55 K.
Conclusions:
- The observed transient collective ordering is attributed to an enhanced f-d exchange interaction.
- These findings offer insights into the manipulation of magnetization in magnetic semiconductors.
