Investigation of dynamic phenomena in spin crossover nanomaterials
(Studii asupra fenomenelor dinamice in nanomateriale cu tranzitie de spin)
Funded by Romanian Ministry of Research, Innovation and Digitization, CNCS/CCCDI-UEFISCDI, Project No. PN-III−P4-ID-PCE-2020-1946, within PNCDI III
Project Director: Prof. univ. dr. Cristian ENACHESCU
(Faculty of Physics, Alexandru Ioan Cuza University, Iași)
The project is devoted to the interaction with the light of the nanoscale thin films, and the time dependence of subsequent processes.
The coupling with phonons will be analysed in the framework of a new model, including the dynamic features of the crystal packing. This work brings the photo-switching of materials into a new perspective, different from the common approach, focused on electron and optical phonon dynamics at ultrafast timescales.
The aim of this project is to understand the switching and controlling the spins in molecular magnets in dynamic phenomena at nanoscale, to better handle and apply the properties of bistability and switching in devices using these materials.
The long-term perspective consists in clarifying the possibilities of their application for the high-density storage of information, or for their use as sensors and actuators. The systematic experimental studies will be correlated and interpreted by the simultaneous use of theoretical and numerical studies. The theoretical studies will be based on the experimental data and will be used not only to explain the observations, but also to propose new experimental procedures.
The central ideas of this scientific project are based on the fact that (i) the behaviour of nanoparticles embedded in various matrices or prepared as thin layers is different when comparing them to isolated micro and nanoparticles; (ii) the physics of ultrafast processes triggers a complex out-of-equilibrium dynamics involving different mechanisms occurring at different time and length scales, different than the ones observed under nanosecond irradiation. The understanding of the dynamical SC mechanisms is yet in its infancy, in both experimental (e.g. using optical microscopy and by ultrafast experiments), and theoretical details, the current project taking the challenge of these open questions.