| Budget Amount *help |
¥213,720,000 (Direct Cost: ¥164,400,000、Indirect Cost: ¥49,320,000)
Fiscal Year 2012: ¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Fiscal Year 2011: ¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Fiscal Year 2010: ¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
Fiscal Year 2009: ¥68,120,000 (Direct Cost: ¥52,400,000、Indirect Cost: ¥15,720,000)
Fiscal Year 2008: ¥92,170,000 (Direct Cost: ¥70,900,000、Indirect Cost: ¥21,270,000)
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| Research Abstract |
Our purposes of this project are to create the new physical properties and functionalities in superparamagnets by switched with the external stimulus. One strategy that we have employed is to prepare conducting SMMs, like [Pc_2Tb]Cl_0.6, which has a blocking temperature of 47K and whose magnetic properties showed hysteresis below 10K. This SMM shows negative magnetoresistance below 8 K. In our second strategy, we have incorporated planar memory into a double-decker Tb(III) SMM (Pc_2Tb). In addition, we have observed a Kondo Effect at 4.8 K by using scanning tunneling spectroscopy (STS) for the first time. We can control the appearance and disappearance of the Kondo peak by injecting an electron using an STS. This is considered to be the first single-molecule memory device. In our third strategy, we have prepared field effect transistor (FET) devices of SMMs. The Pc2Dy device shows ambipolar (n- and p-type) behavior, whereas the Pc2Tb device shows p-type behavior. This difference is explained by the energy levels of the lanthanide ions. In the fourth strategy, we have doped Cs atoms onto Pc_2Y. Although Pc_2Y molecules show Kondo peaks due to the unpaired spin in the Pc ligand, when doped, Kondo peaks are not observed due to coupling of the radical Pc and the 6s electrons of the Cs atom. Finally, by doping with and manipulating the Cs atoms, we could write the letters T and U, which are the initials of Tohoku University.
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