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Updated: Jun 20, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Ultrafast spin transfer and its impact on the electronic structure
Kamil Bobowski1, Xinwei Zheng1, Björn Frietsch1
1Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany.
Optically induced intersite spin transfer (OISTR) was observed in gadolinium metal, showing ultrafast spin polarization changes. This research reveals synchronous alteration of magnetic exchange splitting, enabling tunable ultrafast magnetization control.
Area of Science:
- Condensed matter physics
- Materials science
- Ultrafast phenomena
Background:
- Optically induced intersite spin transfer (OISTR) allows ultrafast manipulation of spin systems.
- Previous studies observed OISTR in magnetic alloys and multilayers.
- The behavior of band structure during ultrafast spin transfer remains unclear.
Purpose of the Study:
- To investigate ultrafast spin transfer in ferromagnetic gadolinium metal.
- To determine if band structure follows ultrafast spin polarization changes or remains rigid.
- To explore the influence of temperature-dependent spin mixing on demagnetization onset.
Main Methods:
- Theoretical investigation of ultrafast spin transfer dynamics.
- Analysis of charge transfer between localized and extended electronic states.
- Examination of synchronous changes in surface spin polarization and bulk band splitting.
Main Results:
- Ultrafast spin transfer was confirmed in ferromagnetic gadolinium.
- Charge transfer decreases surface spin polarization, synchronously altering bulk valence band exchange splitting.
- Demagnetization onset is tunable by over 200 fs via temperature-dependent spin mixing.
Conclusions:
- The band structure dynamically responds to ultrafast spin polarization changes.
- OISTR in gadolinium offers a pathway for ultrafast magnetization control.
- Findings expand the applicability of OISTR for manipulating magnetic properties.
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