The Effect of Single Molecular Magnet Positions Between Ferromagnetic Electrodes of Variable Thickness on the Magnetic Properties of the Molecular Spintronics Devices.

The magnetic tunnel junction (MTJ) based molecular spintronics device (MTJMSD) approach offers myriad opportunities to investigate various combinations of magnetic molecules and ferromagnetic (FM) electrodes to realize novel forms of magnetic metamaterials. MTJMSD is formed by placing magnetic molecular channels along the exposed sides of a MTJ, and hence molecules appear in the form of a ring around the tunnel barrier. However, there is a knowledge gap about the role of the thickness of the FM electrodes on the magnetic properties of the MTJMSD. This paper provides insights about effect of placing the molecular layer between two FM electrodes of different thicknesses while varying exchange coupling between molecules and the FMs at different thermal energy. We have studied the effect of FM electrode thickness using continuous spin Monte Carlo Simulation (MSC). The effect of FM electrode thickness was strongly dependent of the molecule coupling with the two FM electrodes. Thinner FM electrodes achieved the equilibrium state quicker as compared to thicker FM. The spatial correlation of the magnetic molecular spin with FM electrodes spins was dependent on the FM electrode thickness. Thermal energy impacted the molecular coupling influence on the FM electrode of different thickness.