3 years ago

Plasmon-induced demagnetization and magnetic switching in nickel nanoparticle arrays.

Jorn P. Witteveen, Sebastiaan van Dijken, Päivi Törmä, Francisco Freire-Fernandez, Mikko Kataja, Tommi Hakala

We report on the manipulation of magnetization by femtosecond laser pulses in a periodic array of cylindrical nickel nanoparticles. By performing experiments at different wavelength, 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.

Publisher URL: http://arxiv.org/abs/1711.02943

DOI: arXiv:1711.02943v1

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