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Resonant optical pumping of $f\ensuremath{-}f$ electronic transitions in the ${\mathrm{Dy}}^{3+}$ subsystem with femtosecond laser pulses in the multisublattice antiferromagnet ${\mathrm{DyFeO}}_{3}$ produces a strongly pronounced effect on the induced magnetization dynamics. Analyzing the polarization and spectral properties of the emitted THz radiation, we infer that the resonant pumping magnetizes the partially ordered ${\mathrm{Dy}}^{3+}$ ions on a femtosecond time scale with the induced longitudinal change of the magnetization reaching almost $1%$. We also show that for laser photon energies close to the $f\ensuremath{-}f$ resonance of ${\mathrm{Dy}}^{3+}$ ions, a minimum in the efficiency of spin-wave excitation in the ${\mathrm{Fe}}^{3+}$ subsystem via the inverse Faraday effect is observed. This observation reveals that the resonant photo-induced magnetization in the ${\mathrm{Dy}}^{3+}$ subsystem and the off-resonant excitation of spin waves in the ${\mathrm{Fe}}^{3+}$ subsystem are intrinsically competing processes.

physical review b

Terahertz magnetization dynamics induced by femtosecond resonant pumping of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>Dy</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>subsystem in the multisublattice antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>DyFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Terahertz magnetization dynamics induced by femtosecond resonant pumping ofDy3+subsystem in the multisublattice antiferromagnetDyFeO3