Ultrafast Magneto-Optics in Nickel Magnetoplasmonic Crystals

I A Novikov; M A Kiryanov; P K Nurgalieva; A Yu Frolov; V V Popov; T V Dolgova; A A Fedyanin

doi:10.1021/acs.nanolett.0c03305

Ultrafast Magneto-Optics in Nickel Magnetoplasmonic Crystals

Nano Lett. 2020 Dec 9;20(12):8615-8619. doi: 10.1021/acs.nanolett.0c03305. Epub 2020 Nov 25.

Authors

I A Novikov¹, M A Kiryanov¹, P K Nurgalieva¹, A Yu Frolov¹, V V Popov¹, T V Dolgova¹, A A Fedyanin¹

Affiliation

¹ Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.

PMID: 33238104
DOI: 10.1021/acs.nanolett.0c03305

Abstract

Here, we report on ultrafast all-optical modulation of the surface-plasmon (SP)-assisted transverse magneto-optical Kerr effect (TMOKE) and the reflectance in a one-dimensional nickel magnetoplasmonic crystal (MPC). A 50 fs nonresonant laser pump pulse with 7 mJ/cm² fluence reduces the magnetization by 65%, which results in the suppression of TMOKE in the SP-resonant probe from 1.15% to 0.4%. The differential reflectance of SP-resonant probe achieves 5.5%. Besides this, it is shown that electron thermalization and relaxation in MPC are several times slower than those in the plane nickel.

Keywords: all-optical control; electron and spin dynamics; magnetoplasmonics; plasmonic crystals; ultrafast demagnetization; ultrafast optics.