Ultrafast all-optical magnetization reversal in GdFeCo films around
plasmonic nanostructures

Vladimir Kochergin; Sergiy Cherepov; Robert N. Schwartz; Kevin Flanagan; Ilya N. Krivorotov; Evgeniy V. Kochergin; Kang L. Wang

doi:10.1117/12.2021907

11 September 2013 Ultrafast all-optical magnetization reversal in GdFeCo films around plasmonic nanostructures

Vladimir Kochergin, Sergiy Cherepov, Robert N. Schwartz, Kevin Flanagan, Ilya N. Krivorotov, Evgeniy V. Kochergin, Kang L. Wang

Author Affiliations +

Proceedings Volume 8809, Plasmonics: Metallic Nanostructures and Their Optical Properties XI; 88090U (2013) https://doi.org/10.1117/12.2021907
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

Abstract

It has recently been experimentally demonstrated that reproducible and controllable all-optical magnetization reversal in GdFeCo films can be achieved with a single ultrafast (from 40fs to 3ps) femtosecond laser pulse. While the microscopic origin of the effect is still unclear, we suggest that the effect is caused by a combination of light-induced quasi-static magnetic field, with dynamic thermal effects due to laser heating, as well as magnetic fields generated by thermoelectric effect-caused electrical currents. This finding reveals great potential for ultrafast data storage through magnetic switching without the aid of an external magnetic field. It was further recently predicted that utilization of plasmonic nanostructures may provide the way to achieve fast all-optical magnetization switching with smaller/cheaper laser sources with longer pulse durations. We will present the simulations of temporal dynamics of magnetization reversal around plasmonic nanostructures with the combination of Landau Lifshitz Bloch and finite element modeling. Our modeling results predict that plasmonic nanostructures can significantly alter all-optical magnetization switching process and may help achieve a number of technologically important effects that cannot be achieved otherwise. Results of experimental studies of optical magnetization reversal in GdFeCo films around plasmonic nanostructures are also provided.

Citation Download Citation

Vladimir Kochergin, Sergiy Cherepov, Robert N. Schwartz, Kevin Flanagan, Ilya N. Krivorotov, Evgeniy V. Kochergin, and Kang L. Wang "Ultrafast all-optical magnetization reversal in GdFeCo films around plasmonic nanostructures", Proc. SPIE 8809, Plasmonics: Metallic Nanostructures and Their Optical Properties XI, 88090U (11 September 2013); https://doi.org/10.1117/12.2021907

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KEYWORDS

Plasmonics

Magnetism

Nanostructures

Pulsed laser operation

Ultrafast phenomena

Electrons

Switching

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