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Updated: Jan 5, 2026
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
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Plasmonic layer-selective all-optical switching of magnetization with nanometer resolution
D O Ignatyeva1,2, C S Davies3,4, D A Sylgacheva5,6
1Faculty of Physics, Lomonosov Moscow State University, 119991, Moscow, Russia. daria.ignatyeva@gmail.com.
Nature Communications
|October 23, 2019
Summary
Researchers achieved ultra-precise magnetic recording using femtosecond laser pulses. This breakthrough allows selective magnetization reversal in nanolayers, overcoming previous spatial resolution limits for optical data storage.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- All-optical magnetization reversal offers fast, low-dissipation magnetic recording.
- Achieving sub-wavelength spatial resolution for magnetic bit writing has been a significant challenge.
Purpose of the Study:
- To demonstrate selective all-optical magnetization reversal in individual nanolayers within a heterostructure.
- To overcome the diffraction limit in optical magnetic recording.
Main Methods:
- Utilized femtosecond laser pulses (800 nm wavelength).
- Exploited plasmon-polariton excitation at specific nanostructure interfaces.
- Manipulated magnetization by rotating the polarization of linearly polarized light.
Main Results:
- Successfully toggled magnetization in one of two 10-nm magnetic nanolayers (80 nm apart) using a single laser pulse.
- Demonstrated exclusive layer addressing by rotating the optical pulse polarization by 90°.
- Achieved selective magnetization reversal without affecting adjacent nanolayers.
Conclusions:
- Developed a robust method for targeted magnetization switching in nanolayer heterostructures.
- Paved the way for significantly increasing storage density in opto-magnetic recording systems.
