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Research Results

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1998
2009
Nov. 2009
  Superstructured Thin Film Chemistry group (M. Kawasaki group) has successfully demonstrated the systematic control of two-dimensional (2D) electron transport at an oxide heterointerface using Schottky-gating via conducting polymer, PEDOT:PSS (poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate)). PEDOT:PSS works as a good Schottky contact electrode on oxide semiconductor ZnO, due to clean organic-inorganic interface in terms of crystallographic abruptness and electronic junction properties. This achievement paves a way for such field-effect transistors with harmless, transparent, and low cost in nature. The work has been carried out in collaboration with JST for specimens partly supplied by a company, ROHM Co. Ltd. This result has become public in Advanced Materials (online publication) on November 25th, 2009 and also introduced by such press sources as The Chemical Daily (Nov. 25th, 2009), Dempa-Shinbun (Dec. 2, 2009) and Nikkan Kogyo Shimbun (Jan. 20th, 2010).
Nov. 2009
  Division of Low Temperature Condensed State Physics, in collaboration with International Advanced Research and Education Organization, establish a simple method to search for new superconductors by applying a voltage to materials. Despite the world-first realization of voltage-induced superconductivity last year by an IMR/WPI-AIMR collaboration, this method still has been limited to one specific material. Here, we introduced ionic liquids, which significantly broadened the variety of materials and succeeded in increasing Tc from last year’s 0.4 K to 15 K. This achievement was published in Nature Materials (AOP, 22nd Nov.), and was reported in NHK-TV (23rd), Mainichi, Kahoku Shimpo, and other newspapers (24th).
Prof. Iwasa’s group (Low Temperature Condensed State Physics)
Oct. 2009
  Division of Hydrogen Functional Materials, in collaboration with Swiss Federal Institutes (EMPA and ETH-Zürich) and Graduate School of Engineering, Tohoku University, has developed new complex hydrides exhibiting lithium fast-ion conduction at room temperature. The hydrides consisting of plural complex anions [(BH4)- and (NH2)-] exhibit lithium-ion conductivity of nearly 10,000 times higher than those of the conventional hydrides with single complex anion. This study demonstrates an important research direction on searching for advanced lithium-ion conductors and solid-electrolytes. This work was supported by Global COE program of Tohoku University, Integrated Project of ICC-IMR, and KAKENHI Grant-in-Aid for Scientific Research (A); and the results were published in Journal of the American Chemical Society (online, October 26th, 2009).
Oct. 2009
  Surface and Interface Research group has successfully fabricated ideal organic thin film transistor in collaboration with the University of Tokyo, suppressing defect formation around the electrodes via chemical functionalization of their surfaces. This technique could improve the performance of organic devices for low-cost display control circuits. This work was performed under the Inter-university Cooperative Research Program of the Institute for Materials Research, and the results were published online in Advanced Materials on October 2, 2009, which was also featured in the Nature Asia Materials website.
Sept. 2009
  Department of Computational Materials Science (Kawazoe group) has predicted that the halfside-hydrogen terminated graphese (called graphone) is a two-dimensional ferromagnet having 0.5 Bohr magneton for each carbon atom by ab initio computer simulation as an international collaboration work with Prof. Q. Sun with Beijing University and Prof. Q. Wang and Prof. P. Jene with Virginia Commonwealth University. Althouhg there have been many researches conducted on magnetic properties in graphene, previous studies employed edges or defects in graphene and they have difficulty to realize uniform macroscopic ferromagnetism. According to the present prediction, it is possible to realize uniform ferromagnet in wide area and could be used as really useful magnetic matarial. The paper was published in Nano Letters on 31st August, 2009 from American Chemical Society, and reported by Nikkan Kogyo Shimbun on 29th September.
Sept. 2009
  Theory of Solid State Physics group (Prof. Maekawa's group) has developed a new computer simulation method for magnetic semiconductors in collaboration with University of Tokyo. The new method makes it possible to precisely analyze magnetic properties including the electron-electron interaction in materials. The newly developed method has improved theoretical analyses of magnetic semiconductors. Although ferromagnetic semiconductors have been made only at low temperatures, the new method is expected to design materials for magnetic semiconductors that show ferromagnetic properties at high temperatures, and to contribute to application of spintronics devices. The results have been selected the Editor’s choice of the “Journal of the Physical Society of Japan” and reported in news papers (Kagaku Shinbun, on Sep. 3, 2009).
Prof. Maekawa's group(Theory of Solid State Physics)
Sept. 2009
  A new and original method has been successfully applied for growth of dislocation-free germanium (Ge) crystal. During the crystal growth, generally, germanium oxides are inevitably formed and such oxide particles floating on the Ge melt surface attach to the Ge grown crystal, resulting in generation of dislocations. Prof. Yonenaga’s group investigated the reactions during Ge crystal growth in detail and found that such particles could be completely removed by adopting B2O3 liquid. Ge melt was partially covered with B2O3 liquid and a dislocation-free Ge crystal was successfully grown from such Ge melt. This result has been published in Journal of Crystal Growth (online: on September 9, 2009).
Aug. 2009
  Division of Low Temperature Physics in collaboration with Department of Physics, Tohoku University found a new mechanism of the metal-insulator transition induced by applying laser light to organic Mott insulators. The collaboration team succeeded to realize an optical modulation of the effective on-site Coulomb energy at the molecular dimer site of the organic Mott insulator. The present technique will develop new photo-induced phenomena in future. This result was published in Physical Review Letters (PRL 7, August 2009) and reported in news paper (Nikkei Sangyo Shimbun, on August 25, 2009). 
Aug. 2009
  Theory of Solid State Physics group (Prof. Maekawa's group) has developed, in collaboration with Hitachi, Ltd., a new simulation tool for spintronics devices to calculate and control the spin current and spin torque. Through the simulation, the optimum device structure and the current distribution in the device for obtaining the magnetization switching may be predicted. The research group has applied the tool to a ferromagnetic bilayer that has been difficult to be analyzed because of the complicated current distribution. The new tool will help designing spintronics devices. The results have been presented at International Conference on Magnetism (ICM2009) held at Karlsruhe, Germany on July 26 - 31 and reported in news papers (Kagaku Kogyo Nippou, on July 27, 2009 and Nikkan Kogyo Shimbun, on July 30, 2009).
Prof. Maekawa's group(Theory of Solid State Physics)
Jul. 2009
  A joint research group has established the world record of X-ray Magnetic Circular Dichroism (XMCD) Spectroscopy. I provides a orbital and element selective magnetization. The magnetic field is as high as 40 T, that is 1 million times of terrestrial magnetism. It breaks the limit of XMCD method which had been limited for ferromagnetic compounds and widen the application of the XMCD for various types of magnetic compounds. The group consists of Institute for Materials Research, Tohoku University, Institute for Solid State Physics, University of Tokyo, Japan Atomic Energy Agency (JAEA), the Japan Synchrotron Radiation Research Institute (JASRI), and Graduate School of Sciences, Kyushu University. The result is published in Physical Review Letters(2009/7/21)and introduced in Nikkan Gogyo News Paper(2009/8/26) .
May. 2009
  1st: Over review of organization, cooperative papers and patents in the new project on Joining Technology for New Metallic Glasses and Inorganic Materials which has been organized in cooperation among the research groups at three institutes; Institute for Materials Research, Tohoku University; Materials and Structure Laboratory, Tokyo Institute of Technology; and Joining and Welding Research Institute, Osaka University.  2nd: news of joining for metallic glass and steel, and polymer film in Osaka University  3rd: news of research result for reason of metallic glasses against soldering, and electromagnetic strain joining inorganic device using metallic glass in Tokyo Institute of Technology.  4th: news of superior hydrogen permeability by amorphous oxide laminated Ni-based metallic glass membrane, compared with high cost Pd one, by cooperation of Institute for Materials Research and Materials and Structure Laboratory.  5th: news of Au-Cu-based metallic glass which can be wrought in hot water, by Materials Research and Materials.  6th: news of biomedical finger joint with bioactivity which is fabricated by bioactive ceramic layers on Ti-based metallic glass, based on cooperation of three institutes.  7th: news of dc current induced-ac one device by room-temperature quantum dot tunneling, using of Ni-based glassy alloy with hydrogens, consisting of nano scale size icosahedral metallic clusters.
Mar. 2009
  Division of Low Temperature Condensed State Physics, in collaboration with Univ. Liverpool, Univ. Durham, Joseph Stephan Inst., RIKEN, and AIST, clarified mysteries in physical properties of Cs3C60, which displays the highest superconducting critical temperature at 38 K amoung molecular materials. This compound was first suggested to superconduct at high temperature about 15 years ago by Prof. Iwasa’ group at AT&T Bell Laboratories, and very recently, British group succeeded in synthesis of high quality samples, and confirmed Bell Labs’ claim. This research uncovered the nature of strong electron correlation in fullerene systems, by determining the temperature-pressure phase diagram of Cs3C60. This result was published in Science on March 20, 2009, and reported in news papers(Nikkan Kogyo Shimbun, on March 23, 2009, and Kagaku Shimbun, on April 3, 2009).
Prof. Iwasa’s group (Low Temperature Condensed State Physics)
Mar. 2009
  Theory of Solid State Physics group (Prof. Maekawa's group) has realized, in collaboration with University of Tokyo and University of Miami, a “spin-motive force” (smf), a novel mechanism to drive electrical currents due to static magnetic fields. The existence of smfs was theoretically predicted by Prof. Maekawa and coworkers several years ago and which is now proved experimentally by using magnetic tunnel junctions with ferromagnetic nanoparticles. This finding has renewed Faraday’s law of electromagnetic induction, a fundamental law of physics, after almost 180 years. Due to the smf more than 100,000 % huge magnetoresistance (1000 times larger than existing technology) was achieved. The smf offers a very efficient way of conversion between electric and magnetic energies, enabling us to fabricate a new type of spin-batteries and ultra-high-sensitive magnetic sensors. This result was published in Nature on March 8th (online), and also introduced in Nikkan Kogyo on March 9th (Japan time).
Prof. Maekawa's Group (Theory of Solid State Physics)
Feb. 2009
  Laboratory for Computational Materials Science (Kawazoe Lab) has been successfully shown that the third carbon crystal K4 after diamond and graphite should exist by the first principles calculations as a CREST team with Prof. Kotani, Prof. Ajiri, and Prof. Sunada. This K4 carbon crystal has an atomic structure in 3 dimensional space composed with sp2 bondings between all carbon atoms, differently to 2 dimensional structure in graphite. Diamond has also completely different which composed of sp3 bondings. This K4 crystal is metallic in nature, and it is expected that by doping we can create stable superconductor, macroscopic conducting line, etc. which have been difficult to be realized by carbon nanostructures. Actually computations have been performed by Dr. Masahiro Itoh in Ajiri Lab. This result was published in Physical Review Letters (PRL 102 , 6 Feb, 2009) and reported in a number of newspapers, such as Nikkei Sangyo Shimbun, Nikkan Kogyo Shimbun, Kahoku Shimpo, and Tokyo Shimbun.
Jan. 2009
  Theory of Solid State Physics group (S. Maekawa’s group), in collaboration with research groups from National Taiwan University and University of Tokyo has revealed that a giant spin Hall effect is caused by the skew scattering mechanism by iron magnetic impurities. Performing a first principle band structure calculation for iron impurities in Au, it is found that a novel type of Kondo effect due to strong correlation between electrons of iron orbitals induces a very large spin Hall angle, which explains recent observation of giant spin Hall effect using a device with iron-platinum (FePt) and gold (Au) electrodes [T. Seki et al., Nature Materials 7, 125 (2008)]. The result provides a new strategy for generating spin current which manipulates magnetic memories and quantum bits in spintronics devices. This research achievement was published in the Journal of the American Physical Society “Physical Review Letters” on 23, January 2009, and selected for a “Viewpoint in Physics” of the same issue.
Prof. Maekawa's group(Theory of Solid State Physics)
Jan. 2009
  We have succeeded in imparting room-temperature lithium fast-ion conductivity to a complex hydride LiBH4 by chemical modification. This study, collaborated with Assoc. Profs. H. Maekawa and H. Takamura (Graduate School of Engineering, Tohoku University), will lead to the developments of advanced solid-state electrolytes for high-safety lithium ion battery. The result was published in Journal of American Chemical Society (131, 894, 2009), and reported in Nikkei NET (online, January 23, 2009), Nikkan-Kougyo Shimbun (January 27, 2009).