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Single-Shot Multi-Level All-Optical Magnetization Switching Mediated by Spin Transport
Satoshi Iihama1,2, Yong Xu1, Marwan Deb1
1Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine, 54506, Vandoeuvre-lés-Nancy, France.
Advanced Materials (Deerfield Beach, Fla.)
|October 19, 2018
Summary
Ultrafast magnetization switching using single laser pulses was achieved in Co/Pt multilayers. This breakthrough enables deterministic control of magnetic states for advanced data storage.
Area of Science:
- Optics and Magnetism
- Materials Science
- Nanotechnology
Background:
- All-optical ultrafast magnetization switching is key for energy-efficient magnetic storage.
- Current methods often require external magnetic fields or multiple optical pulses.
- GdFeCo ferrimagnetic films are known to switch with a single pulse.
Purpose of the Study:
- To demonstrate single-pulse all-optical magnetization switching in Co/Pt multilayers.
- To explore the potential of Co/Pt multilayers in spin-valve structures for magnetic storage.
- To investigate deterministic switching of ferromagnetic layers using optical pulses.
Main Methods:
- Utilized femtosecond (fs) laser pulses for all-optical switching experiments.
- Investigated a [Co/Pt]/Cu/GdFeCo magnetic spin-valve structure.
- Analyzed spin-polarized currents generated by light-matter interactions.
Main Results:
- Achieved single-pulse magnetization switching in Co/Pt multilayers within a spin-valve.
- Demonstrated access to four distinct magnetic configurations using sequential fs pulses.
- Identified spin-polarized currents from GdFeCo as the determinant of the [Co/Pt] layer's final state.
Conclusions:
- This work presents a novel approach for deterministic all-optical switching of ferromagnetic layers.
- The findings pave the way for engineering materials for opto-magnetic multi-bit recording.
- Enables development of ultrafast and energy-efficient magnetic storage technologies.
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