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Research Results

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Nov. 2008
  Low Temperature Physics group (Prof. Kobayashi’s group) has succeeded in finding the modification of the organic Mott insulators to the electronic conductive metal by x-ray irradiation. X-ray irradiated organic Mott insulators show large enhancement of the far infrared optical reflectivity, which indicates that conductive carriers are induced. This finding contributes not only for progress of the basic research on the organic conductors but also for developing the organic electronic devices for applications in future. This result was published in Physical Review Letters (vol. 101, No. 20, Nov. 14, 2008), and was introduced also by such press sources as Nikkan Kogyo Shimbun (Nov. 25th, 2008), the Chemical Daily (Nov. 26th), Asahi Shimbun (Nov. 28th) and Kagaku Shimbun (Dec. 5th).
Nov. 2008
  Superstructured Thin Film Chemistry group (M. Kawasaki's group) has succeeded in developing a transparent spintronics material based on titanium dioxide (TiO2). Co-doped TiO2 has very high Curie temperature ~600 K with a small amount of Co, and its thin film is transparent and can be grown on glass substrate. Accordingly, this compound is expected to be used for semiconductor spintronics devices operable at room temperature. This work was supported in part by New Energy and Industrial Technology Development Organization, the Industrial Technology Research Grant Program. This result appeared in such presses as Nikkei Sangyo Shimbun (Nov. 6th).
Oct. 2008
  Superstructured Thin Film Chemistry group (M. Kawasaki's group) has succeeded in inducing superconducting state by an electric field-effect in an insulating SrTiO3 single crystal. Many superconductors have been developed by substitution of impurity atoms into an insulating mother materials. In this study, electric double layer transistor, a sort of field-effect transistor, was employed for accumulating high-density charges into an insulating oxide. Application of several voltages on the device switches the insulator to superconductor, which opens up a new way to develop new superconducting material without chemical substitution. The work has been done in collaboration with WPI-AIMR and CLTS of Tohoku-U and JST. This result was published in Nature Materials (Advanced Online Publication) on October 12th (London time), and also introduced by such press sources as NHK, Higashinihon-hoso, Asahi, Yomiuri, Kahoku-Shimpo (Oct. 13th), Nikkei Shimbun (Oct. 20th) and Kagaku Shimbun (Nov. 14th).
Oct. 2008
  Theory of Solid State Physics group (S. Maekawa's group), in collaboration with research groups from Keio University and RIKEN, has revealed that the flow of magnetism, "spin current," can be generated by heating one end of a magnet without the aid of electric currents and magnetic fields for the first time in the world. This thermally created spin current does not involve an electrical current and survives in almost 1cm long, 10000 times longer than those generated by conventional methods. Such a pure spin current enables to drive magnetic memories, magnetic hard disks, and quantum computers, bringing the promising application as the new energy technology. This research achievement was published in the British Science Journal "Nature" on 9, October 2008, introduced in "NEWS & VIEWS" of the same issue, and broadcasted in NHK news (Nov. 19th).
Prof. Maekawa group(Theory of Solid State Physics)
Sept. 2008

 Superstructured Thin Film Chemistry group (M. Kawasaki's group) has developed a high-performance ultraviolet photodetector with ZnO and a conducting polymer. The research was conducted under the collaboration with ROHM Co. Ltd., Kyoto. A conducting polymer, PEDOT:PSS, worked as Schottky contact to ZnO with low defects at the interface. The new-type Schottky diode gives rise to nearly 100% quantum efficiency in the ultraviolet wavelengths. The harmless materials and low-cost processes make the devices promising for the industrialization. The achievements have been published in the September 24th issue of Applied Physics Letters, and also introduced in news papers (Kagaku Shimbun, 2008.10.3 and Nikkan Kogyo Shimbun, 2008.10.6).

May. 2008
  Recently, New Materials Preparation group (Prof. Masahashi’s group) and Osaka Prefecture University have succeeded in the development of the rutile type TiO2 showing excellent water adsorptivity and superhydrophilicity as well as photocatalyst performance under the collaboration with TIG Ltd. in Osaka. The oxide was formed on Ti and its alloys by anode oxidation technique controlling electrochemical conditions, and showed rutile form as being better photocatalytic activity than that of anatase. In addition, superhydrophilicity was confirmed without UV illumination, wherein unprecedented performance to let a water droplet impregnate at high speed inside was observed. These characteristics are probably ascribable to high crystallinity of rutile form with 15-30 nm crystallites and nano-sized pores in microstructures. We can expect wide development of this oxide in the application such as cellular phone, the frame of glasses, medical materials, and water purification. This result was reported in Nikkei-Sangyo Shimbun (July 1st, 2008), Kahoku Shimpo (July 27th) and Tekkou Shimbun (August 5th).
Prof. Masahashi’s group (New Materials Preparation group, Osaka Center for Industrial Materials Research)
May. 2008
  Theory of Solid State Physics group (Maekawa group) has revealed that the dc Josephson current is induced by a coupling between the ac Josephson current and the spin dynamics due to the ferromagnetic resonance (FMR) in a ferromagnetic Josephson junction, which is composed of two superconductors (SC's) separated by a ferromagnetic metal (FM). Since the ac internal magnetic field induced by the precessional motion of spin by FMR is coupled with the phase of superconducting order parameter, the Josephson current oscillates with difference between the frequency of the internal magnetic field and the Josephson frequency proportional to the voltage across the junction. As a result, the dc Josephson current is induced by FMR, when the frequency of the internal magnetic field is equal to the Josephson frequency. We call this phenomenon "ferromagnetic Josephson resonance", which provides a theoretical basis not only for studying the effect of dynamics on the ferromagnetic Josephson junctions but also for developing new superconducting devices such as solid state quantum bits. This work was introduced in J. Phys. Soc. Jpn. 77, 053707 (2008) and also reported in a news paper (Kagaku Shimbun, 2008. 5. 30).
Prof. Maekawa group(Theory of Solid State Physics)
Jan. 2008
  Magnetic Materials group (Prof. Takanashi group) and Theory of Solid State Physics group (Prof. Maekawa group) have successfully observed a giant spin Hall effect in Au using the multi-terminal device consisting of the FePt perpendicular spin injector and the nano-sized Au Hall cross. The spin Hall effect has attracted much attention as a technique to convert charge current into spin current and vice versa without a ferromagnetic material. The present electrical signal of the spin Hall effect at room temperature is two order of magnitude larger than those reported previously, which opens up the new way for writing/reading the information in spin-electronics devices. This work was done in collaboration with Graduate School of Engineering, Tohoku University and AIST, and was published in Nature Materials (Advance Online Publication) on January 13th (London time). This work was also introduced in Nihon-Keizai Shimbun and Nikkan-Kogyo Shimbun (January 14th ).
Prof. Takanashi group(Magnetic Materials), Prof. Maekawa group(Theory of Solid State Physics)