2:15 PM - 2:30 PM
[17p-F104-3] Magnetoresistance of Ni/carbazole oligomer/Ni single-molecule junctions
Keywords:Single-molecule electronics, Spintronics, Magnetoresistance
I am engaged in research about magnetic field dependence of resistance, i.e., magnetoresistance (MR) through single-molecule junctions using ferromagnetic electrodes.
MR is an important phenomenon for magnetic sensors and is used in a reading head of hard disk drives. For better sensors, increasing MR ratio and making devices smaller are necessary.
Single-molecule spintronics is paid attention to exhibit higher MR ratio due to spin-dependent electronic states caused by electronic coupling between ferromagnetic electrodes and molecular orbitals.
I’m trying to detect MR of single-molecule junctions. Interpretation of experimental MR was difficult because the MR originated to ferromagnetic nano-junctions and single-molecule junctions are mixed.
To detect MR originated to single-molecule junctions, I focused on modulation of junction symmetry because theoretical study predicted that MR ratio will change according to symmetry of junction. Therefore, I tried Ni/carbazole 3-mer/Ni single-molecule junctions. Previous study showed that symmetry of molecular orbital of carbazole 3-mer is deformed by applying voltage between electrodes. Therefore, voltage dependence of MR would contain information on characteristics originated to molecule. I have constructed measurement system and succeeded in obtaining preliminary results.
MR is an important phenomenon for magnetic sensors and is used in a reading head of hard disk drives. For better sensors, increasing MR ratio and making devices smaller are necessary.
Single-molecule spintronics is paid attention to exhibit higher MR ratio due to spin-dependent electronic states caused by electronic coupling between ferromagnetic electrodes and molecular orbitals.
I’m trying to detect MR of single-molecule junctions. Interpretation of experimental MR was difficult because the MR originated to ferromagnetic nano-junctions and single-molecule junctions are mixed.
To detect MR originated to single-molecule junctions, I focused on modulation of junction symmetry because theoretical study predicted that MR ratio will change according to symmetry of junction. Therefore, I tried Ni/carbazole 3-mer/Ni single-molecule junctions. Previous study showed that symmetry of molecular orbital of carbazole 3-mer is deformed by applying voltage between electrodes. Therefore, voltage dependence of MR would contain information on characteristics originated to molecule. I have constructed measurement system and succeeded in obtaining preliminary results.