Ab initio study of the laser-induced ultrafast spin dynamics on Ni4@C40H34 carbon cross

Abstract

Miniaturizing magnetic logic is a significant challenge in spintronics. Magnetic molecules, with their complex properties, play a central role in this area. They offer encouraging prospects for today’s and future nanoscale magnetic applications. Here, we suggest a carbon cross system for spin-based logic operability with emphasis on laser-induced spin manipulation across carbon nodes. Using the spin density of the nickels, we accomplish six spin-transfer as well as several local-spin flip processes. All the spin dynamics scenarios can be accomplished in the subpicosecond regime. Varying the strength of the magnetic field can considerably alter the local spin-flip scenarios, while leaving the global spin-transfer processes mostly unchanged. Building all-spin-based functionality can be done with increased speed due to the controllable spin-transfer and spin-flip-transfer scenarios. Furthermore, reversible logic operability leads to reduced power consumption. Here, the reversed spin-transfer processes can be accomplished both with different and the same laser pulses. The impact of the angles of incidence of the laser pulse on the spin dynamics processes is examined. The whole spin dynamics is realized within the subpicosecond domain. The findings of our study offer important knowledge and new understanding on how to successfully control spin dynamics processes on microscopic molecular systems in order to attain a particular logic operation.