Ultrafast magnetization dynamics of a rare-earth Bi-doped garnet were studied using an optical pump–probe technique via the inverse Faraday effect. We observed a wide range of frequency modes of the magnetization precession, covering two orders of magnitude. The excitation efficiency of low-frequency precessions in the GHz range, together with a significant beating effect, strongly depended on the amplitude of the external magnetic field. On the contrary, high-frequency precession was independent of the external magnetic field. The obtained results may be exploited in the development of wide class of microwave and magneto-optical devices.
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Magnetization-induced second-harmonic generation (SHG) enhanced by surface plasma resonances (SPRs) is studied in a Au/(Bi,Tm) iron garnet (IG) perforated magnetoplasmonic crystal capable of sustaining SPRs at both air/Au and Au/(Bi,Tm)IG interfaces. Asymmetry of a crossing point of the SPR branches is shown, demonstrating a significant difference in the SHG spectra at both sides of the complex resonance. Despite the thick (120 nm) Au layer, the sensitivity of the SHG to the SPR at the buried Au/garnet interface is demonstrated through observing an SHG magnetic contrast, when the SHG is amplified by an excitation of the SPR at the bottom interface.
We demonstrate non-thermal ultrafast laser excitation of spin precession with THz frequency in Gd-Bi-substituted iron garnet via the inverse Faraday effect. The modulation of THz precession by about 60 GHz below the compensation temperature of magnetic moment was observed. The THz frequency precession was caused by the exchange resonance between the Gd and Fe sublattices; we attributed the low-frequency modulation to dielectric resonance mode with a magnetic contribution. We demonstrate the possibility of polarization-sensitive control of spin precession under THz generation by laser pulses, helping to develop high-speed magneto-optical devices.
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