Development and Application cf Bistability in Molecule-based Magnetic Mterials

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The science and technology of spin electronic devices have attracted much interest. In this project, we developed molecule-based magnetic materials for future spintronics.1)Thiazyl radicals possess chemical stability and strong intermolecular interactions. We carried out a systematic study, namely, chemical syntheses, structural analyses, and physical measurements on this radical family, and discovered room-temperature magnetic bistability, photo-induced phase transition, organic ferromagnetism, etc.2)Development of molecular-/nano-magnets is a key issue for spintronics. Some of transition-metal cluster complexes exhibit a hysteresis loop on magnetization curve, so that they are called single molecule magnets(SMM). In this project, we performed chemical modifications on SMM, in order to elucidate the magneto-structural correlation and to control the classical and quantum magnetic relaxations. The magneto-structural correlation in SMM was revealed.We also developed synthesis of novel nanomagnets. We succeeded in uniform coating of polystyrene beads (O.D.300-1000 nm) with cobalt hydroxides, and obtained spherical hollow nanomagnets of fee Co and spinel Co_3O_4.