2023/04/28 by S. Häuser, Häuser, Simon, Sebastian T. Weber +22
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Magnetism in coordination complexes #Magneto-Optical Properties and Applications #Materials Science (cond-mat.mtrl-sci)
paper · pdf · doi:10.48550/arxiv.2304.14957
openalex publication_date 2023/04/28 · openalex created_date 2023/05/02 · openalex updated_date 2026/07/28
Optically driven intersite and interlayer spin transfer are individually known as the fastest processes for manipulating the spin order of magnetic materials on the sub 100 fs time scale. However, their competing influence on the ultrafast magnetization dynamics remains unexplored. In our work, we show that optically induced intersite spin transfer (also known as OISTR) dominates the ultrafast magnetization dynamics of ferromagnetic alloys such as Permalloy (Ni80Fe20) only in the absence of interlayer spin transfer into a substrate. Once interlayer spin transfer is possible, the influence of OISTR is significantly reduced and interlayer spin transfer dominates the ultrafast magnetization dynamics. This provides a new approach to control the magnetization dynamics of alloys on extremely short time scales by fine-tuning the interlayer spin transfer.