Near- and mid-infrared excitation of ultrafast demagnetization in a cobalt multilayer system
arXiv:2412.04892 · doi:10.1103/physrevb.109.094407
Abstract
In the last few decades, ultrafast demagnetization elicited by ultrashort laser pulses has been the subject of a large body of work that aims to better understand and control this phenomenon. Although specific magnetic materials' properties play a key role in defining ultrafast demagnetization dynamics, features of the driving laser pulse such as its duration and photon energy might also contribute. Here, we report ultrafast demagnetization of a cobalt/platinum multilayer in a broad spectral range spanning from the near-infrared (near-IR) to the mid-infrared (mid-IR), with wavelengths between 0.8 and 8.7 m. The ultrafast dynamics of the macroscopic magnetization is tracked via the time-resolved magneto-optical Kerr effect. We show that the ultrafast demagnetization of the sample can be efficiently induced over that entire excitation spectrum with minimal dependence on the excitation wavelength. Instead, we confirm that the temporal profile of the pump excitation pulse is an important factor influencing ultrafast demagnetization dynamics.
References in corpus (10)
- Super-Diffusive Spin-Transport as a Mechanism of Ultrafast Demagnetization
- Laser-Induced Magnetic Nanostructures with Tunable Topological Properties
- Ultrafast transport of laser-excited spin polarized carriers in Au/Fe/MgO(001)
- Spin-flip processes and ultrafast magnetization dynamics in Co - unifying the microscopic and macroscopic view of femtosecond magnetism
- THz-driven ultrafast spin-lattice scattering in amorphous metallic ferromagnets
- Ultrafast demagnetization in bulk vs thin films: an ab-initio study
- Nonlinear magnetization dynamics driven by strong terahertz fields
- Nanoscale transient magnetization gratings excited and probed by femtosecond extreme ultraviolet pulses
- Ultrafast laser-driven topological spin textures on a 2D magnet
- THz-driven demagnetization with Perpendicular Magnetic Anisotropy: Towards ultrafast ballistic switching