# 1,000-Fold Enhancement of Light-Induced Magnetism in Plasmonic Au Nanoparticles

Source: [1,000-Fold Enhancement of Light-Induced Magnetism in Plasmonic Au Nanoparticles](<https://www.sota2.com/research/paper/68fa3b9d1e209131ce8d43bf>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-25T00:41:58.613Z

Authors: Oscar Hsu-Cheng Cheng, Dong Hee Son, Matthew Sheldon

Published: 2019-04-25T15:59:51.000Z

## Abstract

Strategies for ultrafast optical control of magnetism have been a topic of intense research for several decades because of the potential impact in technologies such as magnetic memory, spintronics, and quantum computation, as well as the opportunities for non-linear optical control and modulation in applications such as optical isolation and non-reciprocity. Here we report the first experimental quantification of optically induced magnetization in plasmonic Au nanoparticles due to the inverse Faraday effect (IFE). The induced magnetic moment in nanoparticles is found to be ~1,000x larger than that observed in bulk Au, and ~20x larger than the magnetic moment from optimized magnetic nanoparticle colloids such as magnetite. Furthermore, the magnetization and demagnetization kinetics are instantaneous within the sub-picosecond time resolution of our study, supporting a mechanism of coherent transfer of angular momentum from the circularly polarized excitation to the orbital angular momentum of the electron gas.

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1904.11425>)

[PDF](<https://arxiv.org/pdf/1904.11425.pdf>)