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Ultrashort spin-orbit torque generated by femtosecond laser pulses
T Janda1,2, T Ostatnický3, P Němec3
1Institute for Experimental and Applied Physics, University of Regensburg, Universitätsstr. 31, 93053, Regensburg, Germany. tomas.janda@ur.de.
Scientific Reports
|December 13, 2022
Summary
Researchers generated ultrashort spin-orbit torque (SOT) pulses to control magnetization precession in spintronic devices. This ultrafast method is key for developing energy-efficient electronics.
Area of Science:
- Spintronics
- Materials Science
- Condensed Matter Physics
Background:
- Spintronics aims for ultra-high frequency and energy-efficient devices.
- Ultrafast magnetic bit switching is crucial for spintronic applications.
- Spin-orbit torques (SOTs) offer a scalable approach for magnetization switching.
Purpose of the Study:
- To investigate ultrafast magnetization precession dynamics induced by SOTs.
- To demonstrate a method for generating ultrashort SOT pulses.
- To understand the control over magnetization dynamics at ferromagnetic/non-magnetic interfaces.
Main Methods:
- Utilizing femtosecond laser pulses to generate high-amplitude current pulses.
- Employing an electrically biased p-i-n photodiode for current pulse generation.
- Investigating an epitaxial Fe/GaAs interface for SOT-induced effects.
Main Results:
- Successfully generated ultrashort SOT pulses.
- Excited Larmor precession at the Fe/GaAs interface.
- Demonstrated control over current pulse polarity, amplitude, and duration.
- Controlled the propagation direction of current pulses relative to crystal orientation.
Conclusions:
- The study confirms the SOT origin of the excited Larmor precession.
- Provides insights into magnetization precession dynamics under controlled SOT pulses.
- Highlights a pathway for ultrafast and scalable spintronic device development.
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