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Single molecular magnet (SMM) like paramagnetic molecules interacting withthe ferromagnetic electrodes of a magnetic tunnel junction (MTJ) produce a newsystem that differs dramatically from the properties of isolated molecules andferromagnets. However, it is unknown how far deep in the ferromagneticelectrode the impact of the paramagnetic molecule and ferromagnet interactionscan travel for various levels of molecular spin states. Our prior experimentalstudies showed two types of paramagnetic SMMs, the hexanuclear Mn6 andoctanuclear Fe-Ni molecular complexes, covalently bonded to ferromagnetsproduced unprecedented strong antiferromagnetic coupling between twoferromagnets at room temperature leading to a number of intriguingobservations. In this paper, we report Monte Carlo Simulations (MCS) studyfocusing on the impact of the molecular spin state on cross junction shaped MTJbased molecular spintronics device (MTJMSD). Our MCS study focused on theHeisenberg model of MTJMSD and investigated the impact of various molecularcoupling strengths, thermal energy, and molecular spin states. To gauge theimpact of the molecular spin state on the region of ferromagnetic electrodes,we examined the spatial distribution of molecule-ferromagnet correlated phases.Our MCS study shows that under a strong coupling regime molecular spin stateshould be approximately 30 percent of the ferromagnetic electrode atomic spinsto create long-range correlated phases.

Spin State of Single Molecular Magnet (SMM) Creating Long Range Ordering on Ferromagnetic Layers of Magnetic Tunnel Junction -A Monte Carlo Study