Molecular Magnet Induced Transformative Effects in Molecular Spintronics Devices: A Monte Carlo Study
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Molecular Magnet Induced Transformative Effects in Molecular Spintronics Devices: A Monte Carlo Study Christopher D’Angelo1 and Pawan Tyagi2 1
Department of Mathematics and Statistics, University of the District of Columbia, Washington DC 20008, USA 2
Department of Civil and Mechanical Engineering, University of the District of Columbia, Washington DC 20008, USA ABSTRACT Molecular spintronics devices (MSDs) are capable of harnessing the controllable transport and magnetic properties of molecular device elements and are highly promising candidates for revolutionizing computer logic and memory. A MSD is typically produced by placing magnetic molecule(s) between the two ferromagnetic electrodes. Recent experimental studies show that the molecules produced unprecedented strong exchange couplings between the two ferromagnets, leading to intriguing magnetic and transport properties in a MSD. Future development of MSDs will critically depend on obtaining an in-depth understanding of the molecule induced exchange coupling and its impact on MSD’s switchability and temperature stability. However, the large size of MSD systems and unsuitable device designs are the two biggest hurdles in theoretical and experimental studies of magnetic attributes produced by molecules in a MSD. This research theoretically studies the MSD by performing Monte Carlo Simulation (MCS) studies, which have the capacity to tackle large systems- such as MSD based on magnetic tunnel junction (MTJ) test bed. The MTJ based MSD has the distinctive advantage that MTJ test bed can be subjected to experimental magnetic characterizations before and after transforming it into a MSD by bridging the molecules of interest between the two metal electrodes of a MTJ. Hence the result of our MCS can be verified experimentally. INTRODUCTION MSDs have attracted worldwide attention due to their potential to revolutionize logic and memory devices [1, 2]. A typical MSD is comprised of two FM electrodes, coupled by molecular channels. Molecular channels with a net spin state are the basis of a large number of intriguing studies [3], which were either observed experimentally [4, 5] or were calculated theoretically [2]. Porphyrins [6], single molecular magnets [2] and magnetic molecular clusters [7] possess a net spin state and can be synthetically tailored to be employed in a MSD. Single molecular magnetbased MSDs have been widely discussed as the practical architecture for quantum computations [1]. The key fabrication approaches for MSDs are based on: (a) metal break junctions, (b) sandwiching the molecules between two FM electrodes (Fig.1b), and (c) exposed edge using tunnel junction to produce a multilayer edge molecular spintronics device (MEMSD) [8, 9]. The MEMSD device architecture requires a prefabricated tunnel junction where two FM electrodes are separated by the robust insulator (c); then subsequently, the molecular channels are bridged across the insulator to produce a MEMSD [9].
The effect of molecular device elements on the magnetic attributes cannot be studi
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