Itinerant electron nanomagnetism -Photoinduced magnetism accompanied by itinerant electrons-

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We have theoretically characterized nanotubular halogen-bridged platinum complexes in cooperation with experimental research groups. Half-metallic charge-density-wave states as well as novel mixed-valent ground states were revealed. We have found out photoinduced phase transitions of one-way aspect in polyacene, which consists of linearly fused benzene rings. Strucural isomers of the so-called cis and trans types are energetically degenerate but optically distinguishable and therefore the present findings may open a way to a brandnew photochromic device. We have further constructed a nuclear-magnetic-relaxation theory for the field-induced level crossings in single-molecular ring antiferromagnets. Novel NMR observations in octanuclear chromic wheels were theoretically solved.