Plasmonic enhancement of ultrafast all-optical magnetization reversal

Vladimir Kochergin, Lauren N. Neely, Leigh J. Allin, Evgeniy V. Kochergin, Kang L. Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Ultrafast all optical magnetization switching in GdFeCo layers on the basis of Inverse Faraday Effect (IFE) was demonstrated recently and suggested as a possible path toward next generation magnetic data storage medium with much faster writing time. However, to date, the demonstrations of ultrafast all-optical magnetization switching were performed with powerful femtosecond lasers, hardly useful for practical applications in data storage and data processing. Here we show that utilization of IFE enhancement in plasmonic nanostructures enables fast all-optical magnetization switching with smaller/cheaper laser sources with longer pulse durations. Our modeling results predict significant enhancement of IFE around all major types of plasmonic nanostructures for a circularly polarized incident light. Unlike the IFE in uniform bulk materials, nonzero value of IFE is predicted in plasmonic nanostructures even with a linearly polarized excitation. Experimentally, all-optical magnetization switching at 20 times lower laser fluence and roughly 100 times lower value of laser fluence/pulse duration ratio is demonstrated in plasmonic samples to verify the model predictions. The path to achieve higher levels of enhancement experimentally is discussed.

Original languageEnglish
Title of host publicationPlasmonics
Subtitle of host publicationMetallic Nanostructures and Their Optical Properties IX
DOIs
Publication statusPublished - 2011
EventPlasmonics: Metallic Nanostructures and Their Optical Properties IX - San Diego, CA, United States
Duration: 2011 Aug 212011 Aug 25

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8096
ISSN (Print)0277-786X

Conference

ConferencePlasmonics: Metallic Nanostructures and Their Optical Properties IX
CountryUnited States
CitySan Diego, CA
Period11-08-2111-08-25

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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