Peculiarities of the inverse Faraday effect induced in iron garnet films by femtosecond laser pulses

Kozhaev, M. A.; Chernov, A. I.; Savochkin, I. V.; Kuzmichev, A. N.; Zvezdin, A. K.; Belotelov, V. I.

doi:10.1134/s0021364016240097

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…First, we note that for a bare garnet film, circularly polarized 50 fs-long pump pulses used in this work result in the relative precession amplitude (ratio between dynamic and static Faraday rotation values) of about 10 –4 . Using the uniaxial anisotropy field H u and a typical gyromagnetic ratio in garnets, we obtain an effective magnetic field of about 800 Oe. A similar order of magnitude estimation (∼700 Oe) can be derived directly from eq .…”

mentioning

confidence: 99%

Surface Plasmon-Mediated Nanoscale Localization of Laser-Driven sub-Terahertz Spin Dynamics in Magnetic Dielectrics

Chekhov

Stognij²,

Satoh

et al. 2018

Nano Lett.

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We report spatial localization of the effective magnetic field generated via the inverse Faraday effect employing surface plasmon polaritons (SPPs) at Au/garnet interface. Analyzing both numerically and analytically the electric field of the SPPs at this interface, we corroborate our study with a proof-of-concept experiment showing efficient SPP-driven excitation of coherent spin precession with 0.41 THz frequency. We argue that the subdiffractional confinement of the SPP electric field enables strong spatial localization of the SPP-mediated excitation of spin dynamics. We demonstrate two orders of magnitude enhancement of the excitation efficiency at the surface plasmon resonance within a 100 nm layer of a dielectric garnet. Our findings broaden the horizons of ultrafast spin-plasmonics and open pathways toward nonthermal opto-magnetic recording on the nanoscale.

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mentioning

confidence: 99%

Surface Plasmon-Mediated Nanoscale Localization of Laser-Driven sub-Terahertz Spin Dynamics in Magnetic Dielectrics

Chekhov

Stognij²,

Satoh

et al. 2018

Nano Lett.

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“…1a). Iron-garnet films doped with bismuth provide a large Faraday effect and have a relatively low optical absorption in the long-wavelengths visible spectral range 32,33 . Doping allows achieving high magneto-optical figure of merit in the MPC.…”

Section: Resultsmentioning

confidence: 99%

Giant peak of the Inverse Faraday effect in the band gap of magnetophotonic microcavity

Kozhaev¹,

Chernov²,

Sylgacheva³

et al. 2018

Sci Rep

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Optical impact on the spin system in a magnetically ordered medium provides a unique possibility for local manipulation of magnetization at subpicosecond time scales. One of the mechanisms of the optical manipulation is related to the inverse Faraday effect (IFE). Usually the IFE is observed in crystals and magnetic films on a substrate. Here we demonstrate the IFE induced by fs-laser pulses in the magnetic film inside the magnetophotonic microcavity. Spectral dependence of the IFE on the laser pulse wavelength in the band gap of the magnetophotonic microcavity has a sharp peak leading to a significant enhancement of the IFE. This phenomenon is explained by strong confinement of the electromagnetic energy within the magnetic film. Calculated near field distribution of the IFE effective magnetic field indicates its subwavelength localization within 30 nm along the film thickness. These excited volumes can be shifted along the sample depth via e.g. changing frequency of the laser pulses. The obtained results open a way for ultrafast optical control of magnetization at subwavelength scales.

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“…In particular, based on their unique magneto-optical and opto-magnetic behaviors, ferrimagnetic garnets play a central role in effects involving e.g. magnonics [3], magneto-plasmonics [4], the spin-Hall effect [5], photo-magnetism [6,7], the ultrafast inverse Faraday effect [8], etc. In recent years, time-resolved magneto-optical measurements have emerged as one of the most powerful tools for resolving and understanding magnetic and electronic dynamics on a microscopic level and at short time scales [9].…”

Section: Introductionmentioning

confidence: 99%

Laser-induced excitation and decay of coherent optical phonon modes in an iron garnet

Frej

Davies

Kirilyuk

et al. 2023

Journal of Magnetism and Magnetic Materials

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Peculiarities of the inverse Faraday effect induced in iron garnet films by femtosecond laser pulses

Cited by 8 publications

References 22 publications

Surface Plasmon-Mediated Nanoscale Localization of Laser-Driven sub-Terahertz Spin Dynamics in Magnetic Dielectrics

Surface Plasmon-Mediated Nanoscale Localization of Laser-Driven sub-Terahertz Spin Dynamics in Magnetic Dielectrics

Giant peak of the Inverse Faraday effect in the band gap of magnetophotonic microcavity

Laser-induced excitation and decay of coherent optical phonon modes in an iron garnet

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