Magnetization precession after non-collinear dual optical excitation

Abstract

We investigate the impact of non-collinear dual optical excitation on the magnetization precession in a permalloy thin film using two ultrashort laser pulses. By analyzing the magnetization dynamics using time-resolved magneto-optical methods, we find that the excitation with two ultrashort optical pulses introduces a long-lasting modification of the electron system seen as a sizable decrease of the precession frequency and significant increase (about 25%) of the decay time. Our results reveal that the observed effect strongly depends on the respective polarization of the two excitation pulses and the time delay between two optical pulses. Our findings indicate the occurrence of a new nonlinear opto-spin effect during photoexcitation with two interfering optical pulses which can potentially be observed in various materials and at different photon wavelengths.

References in corpus (11)

• Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
• An optically stimulated superconducting-like phase in K3C60 far above equilibrium Tc
• All-optical control of ferromagnetic thin films and nanostructures
• A unified first-principles study of Gilbert damping, spin-flip diffusion and resistivity in transition metal alloys
• Pump-Push-Probe for Ultrafast All-Optical Switching: The Case of a Nanographene Molecule
• Nanoscale transient magnetization gratings excited and probed by femtosecond extreme ultraviolet pulses
• Efficient all-optical helicity dependent switching of spins in a Pt/Co/Pt film by a dual-pulse excitation
• All-optical switching on the nanometer scale excited and probed with femtosecond extreme ultraviolet pulses
• Orbital dynamics during an ultrafast insulator to metal transition
• Signatures of relativistic spin-light coupling in ultrafast magneto-optical pump-probe experiments
• Spin-wave dynamics and symmetry breaking in an artificial spin ice