Field of Research

Solid State Chemistry, Materials Science, Spin Chemistry    

1. Electronic properties of organic radical solids and thin films

2. Chemical synthesis and quantum effects of molecular magnets and nanomagnets
Selected Publications

  • "Ferromangetic Intermolecular Interactions in a Series of Organic Mixed Crystals of Galvinoxyl Radical and its Precursory Closed Shell Compound",
    K. Awaga, T. Sugano and M. Kinoshita,
    (1986) J. Chem. Phys., 85, pp. 2211-2218.

  • "Ferromagnetic Intermolecular Interaction of the Organic Radical, 2-(4-Nitrophenyl)-4,4,5,5,-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy 3-oxide",
    K. Awaga and Y. Maruyama,
    (1989) Chem. Phys. Lett., 158, pp. 556-558.

  • "An Organic Radical Ferromagnet",
    M. Kinoshita, P. Turek, M. Tamura, K. Nozawa, D. Shiomi, Y. Nakazawa, M. Ishikawa, M. Takahashi, K. Awaga, T. Inabe, and Y. Maruyama,
    (1991) Chem. Lett., pp. 1225-1228.

  • "Variable Magnetic Interactions in an Organic Radical System of (m-N-Methylpyridinium a-Nitronyl Nitroxide)?X-: A Possible Kagome Antiferromagnet",
    K. Awaga, T. Okuno, A. Yamaguchi, M. Hasegawa, T. Inabe, Y. Maruyama and N. Wada,
    (1994) Phys. Rev. B, 49, pp. 3975-3981.

  • “Reversible Structural Transformation and Drastic Magnetic Change in a Copper Hydroxides Intercalation Compound”,
    W. Fujita and K. Awaga,
    (1997) J. Am. Chem. Soc., 119, pp. 4563-4564.

  • “Room-Temperature Magnetic Bistability in Organic Radical Crystals “,
    W. Fujita and K. Awaga,
    (1999) Science, 286, pp. 261-262.

  • “Magnetic anisotropy, tunneling effects, high-frequency EPR, and molecular structure of fast-relaxation species of Mn-12”,
    K. Takeda, K. Awaga, T. Inabe, A. Yamaguchi, H. Ishimoto, T. Tomita, H. Mitamura, T. Goto. N. Mori, H. Nojiri,
    (2002) Phys. Rev. B65, 094424.

  • “Packing Motifs in Porphyrazine Macrocycles Carrying Peripherally-Annulated Thiadiazole Rings: Crystal Growths of Metal-Free and Cobalt Tetrakis(1,2,5-thiadiazole)porphyrazines”
    M. Fujimori, Y. Suzuki, H. Yoshikawa, K. Awaga
    (2003) Angew. Chem. Int. Ed., 42, pp. 5863-5865.

  • “Preparation and Magnetic Properties of Hollow Nano-Spheres of Cobalt and Cobalt Oxide: Drastic Cooling-Field Effects on Remnant Magnetization of Antiferromagnet”
    H. Yoshikawa, K. Hayashida, Y. Kozuka, A. Horiguchi, K. Awaga, S. Bandow, S. Iijima
    (2004) Appl. Phys. Lett., 85, pp. 5287-5289.

  • “Coordination bond formation at charge-transfer phase transition in (BDTA)2[Co(mnt)2]“,
    Y. Umezono, W. Fujita, K. Awaga
    (2006) J. Am. Chem. Soc., 128, pp. 1084-1085.

  • “Low-field negative resistance effect in a charge-ordered state of thiazyl radical crystals”,
    K. Okamoto, T. Tanaka, W. Fujita, K. Awaga, and T. Inabe,
    (2006) Angew. Chem. Int. Ed. 45, pp. 4515-4518.

  • H. Yoshikawa, C. Kazama, K. Awaga, M. Satoh, J. Wada, “Rechargeable Molecular Cluster Batteries”, (2007) Chem. Commun, 3169-3170.

  • K. Okamoto, T. Tanaka, W. Fujita, K. Awaga, and T. Inabe, Charge ordering and nonlinear electrical transport in quasi-1D organic chains with strong electrostatic interchain interactions, Phys. Rev. B, 2007, 76, 075328/1-075328/7.

  • Y. Miyoshi, M. Kubo, T. Fujinawa, Y. Suzuki, H. Yoshikawa, and K. Awaga, Electrochromism and Stable n-Type Doping of Highly Oriented Thin Films of Tetrakis(thiadiazole)porphyrazine, Angew. Chem. Int. Ed. 2007, 46, 5532-5536.

  • Q.-L. Ye, Y. Kozuka, H. Yoshikawa, K. Awaga, S. Bandow, and S. Iijima, Effects of the unique shape of submicron magnetite hollow spheres on magnetic properties and domain states, Phys. Rev. B 2007, 75, 224404/1-224404/5.

  • Y. Ito, W. Fujita, T. Okazaki, T. Sugai, K. Awaga, E. Nishibori, M. Takata, M. Sakata, and H. Shinohara, Magnetic properties and crystal structure of solvent-free Sc@C82 metallofullerene microcrystals, Chem. Phys. Chem. 2007, 8, 1019-1024.

  • K. Awaga, T. Tanaka, T. Shirai, Y. Umezono, and W. Fujita, Spin, charge and lattice correlation in thiazyl radicals and their molecular compounds, Comp. Rend. Chim. 2007, 10, 52-59.

  • X. M. Ren, S. Nishihara, T. Akutagawa, S. Noro, T. Nakamura, W. Fujita, and K. Awaga, Pressure effect on spin-Peierls-like transition in quasi-1D spin systems [RBzPy][Ni(mnt)2], Chem. Phys. Lett. 2007, 439, 318-322.

  • K. Shimizu, T. Gotohda, T. Matsushita, N. Wada, W. Fujita, K. Awaga, Y. Saiga, and D. S. Hirashima, Impurity effect in ferromagnetic transition of β-BBDTA・GaBr4
    , J. Magn. Magn. Mater. 2007, 310, 1479-1481.

  • Y. Kondo, H. Yoshikawa, K. Awaga, M. Murayama, T. Mori, K. Sunada, S. Bandow, S. Iijima, Preparation, photocatalytic activities and dye-sensitized solar-cell performance of submicron-scale TiO2 hollow spheres, Langmuir, 2008, 24, 547-550.