Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-11-28
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
37 pages, 22 figures
Scientific paper
Molecular conduction channels between two ferromagnetic electrodes can produce strong exchange coupling and dramatic effect on the spin transport, thus enabling the realization of novel logic and memory devices. However, fabrication of molecular spintronics devices is extremely challenging and inhibits the insightful experimental studies. Recently, we produced Multilayer Edge Molecular Spintronics Devices (MEMSDs) by bridging the organometallic molecular clusters (OMCs) across a ~2 nm thick insulator of a magnetic tunnel junction (MTJ), along its exposed side edges. These MEMSDs exhibited unprecedented increase in exchange coupling between ferromagnetic films and dramatic changes in the spin transport. This paper focuses on the dramatic current suppression phenomenon exhibited by MEMSDs at room temperature. In the event of current suppression, the effective MEMESDs' current reduced by as much as six orders in magnitude as compared to the leakage current level of a MTJ test bed. In the suppressed current state, MEMSD's transport could be affected by the temperature, light radiation, and magnetic field. In the suppressed current state MEMSD also showed photovoltaic effect. This study motivates the investigation of MEMSDs involving other combinations of MTJs and promising magnetic molecules like single molecular magnets and porphyrin. Observation of current suppression on similar systems will unequivocally establish the utility of MEMSD approach.
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