2012 Fiscal Year Final Research Report
Creation of Switching Systems of Superparamagnets by External Stimulus
| Project/Area Number |
20225003
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
Inorganic chemistry
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
MIYASAKA Hitoshi 東北大学, 大学院理学研究科, 准教授 (50332937)
ITO Tasuku 東北大学, 大学院理学研究科, 名誉教授 (90007328)
TAKAISHI Shinya 東北大学, 大学院理学研究科, 准教授 (10396418)
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| Project Period (FY) |
2008 – 2012
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| Keywords | 単分子量子磁石 / 単一次元鎖量子磁石 / 近藤効果 / 負性磁気抵抗 / 単分子メモリ |
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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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[Journal Article] Cyano-Bridged Mn^III-M^III Single-Chain Magnets with M^III=Co^III, Fe^III, Mn^III , and Cr^III2012
Author(s)
H. Miyasaka, T. Madanbashi, A. Saitou, R. Ishikawa, M. Yamashita, S. Bahr, W. Werrsdorfer, R. Crelac
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Journal Title
Chem. Eur. J.
Volume: 18
Pages: 3942-3954
DOI
Peer Reviewed
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[Journal Article] Direct Observation of Lanthanide(III)-Phthalocyanine Molecules on Au(111) by Using Scanning Tunneling Microscopy and Scanning Tunneling Spectroscopy and Thin-Film Field-Effect Transistor Properties of Tb(III) and Dy(III)-Phthalocyanine Molecules2009
Author(s)
K. Katoh, Y. Yoshida, M. Yamashita, H. Miyasaka, B. K. Breedlove, T. Kajiwara, S.Takaishi, N. Ishikawa, H. Isshiki, Y.-F. Zhang, T. Komeda, M. Yamagishi, and J. Takeya
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Journal Title
J. Am. Chem Soc.
Volume: 131
Pages: 9967-9976
DOI
Peer Reviewed
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