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Published on: July 20, 2022
Nanoscale sub-100 picosecond all-optical magnetization switching in GdFeCo microstructures
L Le Guyader1, M Savoini2, S El Moussaoui3
11] Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland [2] Institute for Methods and Instrumentation for Synchrotron Radiation Research (G-ISRR), Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
Researchers demonstrated nanoscale all-optical magnetization switching using femtosecond laser pulses. This breakthrough enables sub-wavelength magnetic recording with ultrafast temporal resolution, paving the way for higher data storage densities.
Area of Science:
- Materials Science
- Physics
- Nanotechnology
Background:
- Ultrafast magnetization reversal using femtosecond laser pulses is a key technology for information writing.
- Improving magnetic recording density necessitates combining ultrafast temporal resolution with sub-wavelength spatial resolution.
Purpose of the Study:
- To experimentally demonstrate nanoscale all-optical magnetization switching.
- To investigate the feasibility of sub-100 picosecond (ps) magnetic switching at the nanoscale.
- To provide a pathway for sub-wavelength magnetic recording.
Main Methods:
- Utilized computational methods to assess nanoscale magnetic switching feasibility.
- Engineered sample structures to focus laser pulses via refraction and interference.
- Employed time-resolved photo-emission electron microscopy (TR-PEEM) for nanoscale switching studies.
Main Results:
- Achieved experimental demonstration of nanoscale sub-100 ps all-optical magnetization switching.
- Confirmed feasibility of nanoscale magnetic switching even with unfocused laser pulses through sample structuring.
- Validated nanoscale magnetic switching pushed to the sub-100 ps regime using TR-PEEM.
Conclusions:
- The study presents a viable method for achieving sub-wavelength magnetic recording.
- Demonstrated precise control over nanoscale magnetic switching through engineered structures.
- Opens new avenues for high-density data storage technologies.
