Spintronics, which is consolidating as the leading technology in nonvolatile magnetic random accessmemories (MRAMs) and magnetic sensors, has expanded its choice of materials to the organic molecules.This is due to weak spin-orbital coupling that allows the electron spin state to be preserved with larger spindiffusion lengths of the order of hundreds of nanometers. To achieve the organic spintronics devices, mucheffort has been paid to explore the spin injection efficiency, tunneling magnetoresistance (TMR), andtunneling electroresistance (TER) in molecular magnetic junctions and multiferroic tunnel junction (MFTJ).However, an alternative switch of the magnetization via the spin-transfer torque (STT) effect has not beenexplored thus far. The main difficulty is the lack of reliable simulation tools for non-collinear magneticcalculations. In this project, we combine the first-principles calculation with the single-band tight-binding(SBTB) model and the non-equilibrium Green’ s function (NEGF) method to investigate the spin transportproperties, especially the non-collinear STT effect, for two types of organic magnetic tunnel junctions(MTJs). The first one is to choose conducting molecules/aromatic compounds with NH- and O-linkers ascentral barriers, which may provide a more well-defied spin-polarized transport. The second one is theFM/organic FE/FM MFTJ, which may exhibit four- and eight-resistance states. We believe that thecombination of first-principles calculation and SBTB model will provide important clues to inspire noveldesigns in organic spintronics devices.
|Effective start/end date||1/08/16 → 31/07/17|
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):