THz Field-induced Spin Dynamics in Ferrimagnetic Iron Garnets

Abstract

THz magnetization dynamics is excited in ferrimagnetic thulium iron garnet with a picosecond, single-cycle magnetic field pulse and seen as a high-frequency modulation of the magneto-optical Faraday effect. Data analysis combined with numerical modelling and evaluation of the effective Lagrangian allow us to conclude that the dynamics corresponds to the exchange mode excited by Zeeman interaction of the THz field with the antiferromagnetically coupled spins. We argue that THz-pump IR-probe experiments on ferrimagnets offer a unique tool for quantitative studies of dynamics and mechanisms to control antiferromagnetically coupled spins.

arXiv comment17 pages, 16 figures

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Cited by in corpus (9)

• Spin pumping at terahertz nutation resonances
• Dynamics of hybrid magnetic skyrmion driven by spin-orbit torque in ferrimagnets
• Nonlinear sub-switching regime of magnetization dynamics in photo-magnetic garnets
• Effective rectification of THz electromagnetic fields in a ferrimagnetic iron garnet
• All-optical non-linear chiral ultrafast magnetization dynamics driven by circularly polarized magnetic fields
• Role of material-dependent properties in THz field-derivative-torque-induced nonlinear magnetization dynamics
• Exploring terahertz-scale exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents
• Magnetic resonance frequency of two-sublattice ferrimagnet with magnetic compensation temperature
• Field-derivative torque induced magnetization reversal in ferrimagnetic Gd${}_{3/2}$Yb${}_{1/2}$BiFe${}_5$O${}_{12}$