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Published on: May 17, 2018
Magnetodynamics in exchange coupled composite magnets.
Richa Bhardwaj1, Antonio Caretta2, Simone Laterza2,3
1Elettra Sincrotrone Trieste S.C.p.A., Strada Statale 14-km 163.5 in AREA Science Park, 34149, Basovizza, Trieste, Italy. rbhardwaj.phy@gmail.com.
Ultrafast laser pulses control magnetization in FeNi/FePt composites. This study reveals sub-picosecond dynamics driven by spin disorder and interlayer coupling, advancing ultrafast magneto-optic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Optics
Background:
- All-optical methods offer precise control over magnetic materials.
- Exchange-coupled composite magnets are key for advanced magneto-optic devices.
- Understanding ultrafast magnetization dynamics is crucial for device speed.
Purpose of the Study:
- Investigate femtosecond laser-induced magnetization dynamics in FeNi/FePt composites.
- Elucidate the element-specific contributions to magnetodynamics.
- Determine the mechanisms governing sub-picosecond magnetic switching.
Main Methods:
- Femtosecond laser excitation.
- Time-resolved magneto-optical Kerr effect (tr-MOKE) spectroscopy in visible and extreme ultraviolet (EUV) ranges.
- Element-specific core-resonant tr-MOKE at Ni, Fe, and Pt edges.
Main Results:
- Observed ultrafast demagnetization and magnetization reorientation within 500 fs.
- Identified a transient increase in in-plane magnetization.
- Element-specific tr-MOKE revealed distinct dynamic contributions from Ni, Fe, and Pt.
Conclusions:
- Sub-picosecond magnetodynamics in FeNi/FePt composites are governed by spin disorder.
- The dynamic interlayer exchange coupling between FeNi and FePt plays a critical role.
- Findings pave the way for designing faster all-optical switching devices.
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