Plasmon-induced demagnetization and magnetic switching in nickel nanoparticle arrays

Mikko Kataja; Francisco Freire-Fernández; Jorn P. Witteveen; Tommi K. Hakala; Päivi Törmä; Sebastiaan Van Dijken

doi:10.1063/1.5012857

Plasmon-induced demagnetization and magnetic switching in nickel nanoparticle arrays

Mikko Kataja, Francisco Freire-Fernández, Jorn P. Witteveen, Tommi K. Hakala, Päivi Törmä, Sebastiaan Van Dijken^* (Corresponding Author)

^*Corresponding author for this work

Physics of Interfaces and Nanomaterials

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

We report on the manipulation of magnetization by femtosecond laser pulses in a periodic array of cylindrical nickel nanoparticles. By performing experiments at different wavelengths, we show that the excitation of collective surface plasmon resonances triggers demagnetization in zero field or magnetic switching in a small perpendicular field. Both magnetic effects are explained by plasmon-induced heating of the nickel nanoparticles to their Curie temperature. Model calculations confirm the strong correlation between the excitation of surface plasmon modes and laser-induced changes in magnetization.

Original language	English
Article number	072406
Journal	Applied physics letters
Volume	112
Issue number	7
DOIs	https://doi.org/10.1063/1.5012857
Publication status	Published - 12 Feb 2018

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AU - Kataja, Mikko

AU - Freire-Fernández, Francisco

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AU - Hakala, Tommi K.

AU - Törmä, Päivi

AU - Van Dijken, Sebastiaan

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AB - We report on the manipulation of magnetization by femtosecond laser pulses in a periodic array of cylindrical nickel nanoparticles. By performing experiments at different wavelengths, we show that the excitation of collective surface plasmon resonances triggers demagnetization in zero field or magnetic switching in a small perpendicular field. Both magnetic effects are explained by plasmon-induced heating of the nickel nanoparticles to their Curie temperature. Model calculations confirm the strong correlation between the excitation of surface plasmon modes and laser-induced changes in magnetization.

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Plasmon-induced demagnetization and magnetic switching in nickel nanoparticle arrays

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