Orbitronics: light-induced orbital currents in Ni studied by terahertz emission experiments.

ABSTRACT: Orbitronics is based on the use of orbital currents as information carriers. Orbital currents can be generated from the conversion of charge or spin currents, and inversely, they could be converted back to charge or spin currents. Here we demonstrate that orbital currents can also be generated by femtosecond light pulses on Ni. In multilayers associating Ni with oxides and nonmagnetic metals such as Cu, we detect the orbital currents by their conversion into charge currents and the resulting terahertz emission. We show that the orbital currents extraordinarily predominate the light-induced spin currents in Ni-based systems, whereas only spin currents can be detected with CoFeB-based systems. In addition, the analysis of the time delays of the terahertz pulses leads to relevant information

SUBMITTER: Xu Y 

PROVIDER: S-EPMC10917802 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature