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Related Experiment Video

Updated: May 4, 2026

Synthesis of Immunotargeted Magneto-plasmonic Nanoclusters

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Published on: August 22, 2014

Subwavelength Localized All-Optical Helicity-Independent Magnetic Switching Using Plasmonic Gold Nanostructures.

Themistoklis Sidiropoulos¹, Puloma Singh¹, Tino Noll¹

¹Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany.

|March 18, 2025

Summary

All-optical, helicity-independent magnetization switching (AO-HIS) uses plasmonic nanostructures to shrink magnetic bits. This enables deterministic, ultrafast, and energy-efficient magnetic data storage on subwavelength scales.

Keywords:

magnetic force microscopy magnetic recording nanoscale all-optical switching plasmonics ultrafast magnetization dynamics

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Area of Science:

Materials Science
Nanotechnology
Physics

Background:

All-optical, helicity-independent magnetization switching (AO-HIS) is crucial for developing ultrafast and energy-efficient magnetic data storage.
High bit density in magnetic storage necessitates reducing the size of optically addressed magnetic bits at specific locations.
Metallic nanostructures supporting localized surface plasmons offer a route to confine electromagnetic fields below the diffraction limit for nanoscale manipulation.

Purpose of the Study:

To demonstrate deterministic all-optical, helicity-independent magnetization switching (AO-HIS) at the nanoscale.
To investigate the role of plasmonic nanostructures in achieving subwavelength magnetic bit localization.
To analyze the magnetic switching patterns induced by optical excitation of plasmonic nanostructures on rare-earth transition metal alloys.

Main Methods:

Fabrication of plasmonic gold nanostructures on a GdTbCo thin film.
In situ magnetic state toggling using optical excitation.
High-resolution magnetic imaging with magnetic force microscopy (MFM).
Excitation using single ultrashort laser pulses at 1030 nm.

Main Results:

Demonstrated deterministic AO-HIS with a minimum magnetic bit width of 240 nm localized at the edges of plasmonic nanobars.
Confirmed reproducible AO-HIS on subwavelength scales due to strong optical field localization by plasmonic nanobars.
Observed distinct magnetic switching patterns for on- and off-resonant excitation of plasmonic nanodiscs via high-resolution MFM.

Conclusions:

Plasmonic nanostructures enable deterministic, subwavelength AO-HIS on GdTbCo films.
Optical field confinement by plasmonic structures is key to achieving nanoscale magnetic bit manipulation.
The study provides a pathway for advancing high-density, energy-efficient magnetic data storage technologies.