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

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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 languageEnglish
Article number072406
JournalApplied physics letters
Volume112
Issue number7
DOIs
Publication statusPublished - 12 Feb 2018

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    Kataja, M., Freire-Fernández, F., Witteveen, J. P., Hakala, T. K., Törmä, P., & Van Dijken, S. (2018). Plasmon-induced demagnetization and magnetic switching in nickel nanoparticle arrays. Applied physics letters, 112(7), [072406]. https://doi.org/10.1063/1.5012857