Terahertz spin dynamics driven by a field-derivative torque

Abstract

Efficient manipulation of magnetization at ultrashort time scales is of particular interest for future technology. Here, we numerically investigate the influence of the so-called field-derivative torque, which was derived earlier based on relativistic Dirac theory [Mondal et al., Phys. Rev. B 94, 144419 (2016)], on the spin dynamics triggered by ultrashort laser pulses. We find that only considering the THz Zeeman field can underestimate the spin excitation in antiferromagnetic oxide systems as, e.g., NiO and CoO. However, accounting for both, the THz Zeeman torque and the field-derivative torque, the amplitude of the spin excitation increases significantly. Studying the damping dependence of field-derivative torque we observe larger effects for materials having larger damping constants.

arXiv comment5 pages, 4 figures, Accepted for publication in Phys. Rev. B (Rapid-Comm.)

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Cited by in corpus (11)

• THz Field-induced Spin Dynamics in Ferrimagnetic Iron Garnets
• Ultrafast antiferromagnetic switching in NiO induced by spin transfer torques
• Inertial effects in ultrafast spin dynamics
• Spin pumping at terahertz nutation resonances
• Influence of inter-sublattice coupling on the terahertz nutation spin dynamics in antiferromagnets
• Theory of magnetic inertial dynamics in two-sublattice ferromagnets
• Terahertz spin dynamics driven by an optical spin-orbit torque
• Dynamics of the relativistic electron spin in an electromagnetic field
• Role of material-dependent properties in THz field-derivative-torque-induced nonlinear magnetization dynamics
• Optically induced magnetic inertia and magnons from non-Markovian extension of the Landau-Lifshitz-Gilbert equation
• Field-derivative torque induced magnetization reversal in ferrimagnetic Gd${}_{3/2}$Yb${}_{1/2}$BiFe${}_5$O${}_{12}$