Year: 2026
Type: article
Abstract: The investigation of spin waves provides fundamental insights into magnetic materials and is essential for advancing spintronic and magnonic technologies. The Transient Grating (TG) technique, a four‐wave mixing method, has been widely used to study collective excitations at controlled wave vectors on the micron to nanometer scale. This study presents an all‐optical TG approach for exciting standing dipolar spin waves with a controlled in‐plane wave vector in a ferrimagnetic Co 78 Gd 22 thin film, with potential applicability to a broad range of materials. Spin waves with a wavelength of 2.5 μm are excited by the interference of two coherent laser pulses on the sample surface and probed through the diffraction of a third laser pulse. Polarization analysis separates magnetic and thermoelastic signals and enables time‐resolved measurements of the spin‐wave dynamics.
Source: Advanced Photonics Research
Institutions: University of Milan, Centre National de la Recherche Scientifique, Sorbonne Université, Institut des NanoSciences de Paris, Ca' Foscari University of Venice, Elettra-Sincrotrone Trieste S.C.p.A., European X-Ray Free-Electron Laser, Massachusetts Institute of Technology, University of Trieste, Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,070
OpenAlex ID: W7128681823