Kenji Yoshii

Kenji Yoshii

Japan Atomic Energy Agency, Japan

Title: Magnetic properties and magnetocaloric effect of field-induced ferromagnet BaFeO3


Kenji Yoshii received his PhD in 1998 from University of Tokyo. He is a Principal Researcher of Japan Atomic Energy Agency. He has published more than 100 papers in the field of solid state science.


Lanthanide ions are well-known to exhibit large magnetic moments and strong magnetic anisotropy and therefore they are considered as good candidates for the elaboration of Single Molecule Magnets (SMMs). Complexation of these particular metal ions by redox active ligands derived from TTFs led to electroactive SMM with antennae effect of the ligands as well as very good correlation between magnetism and luminescence at the molecular scale. In this lecture several compounds exemplifying these features will be reported. Among them, dinuclear complexes of lanthanides associating both 4,5-Bis(thiomethyl) -4’-carboxylictetrathiafulvalene and 4,5-Bis(thiomethyl) -4’-ortho-pyridyl -N-oxide -carbamoytetrathiafulvalene ligands have been elaborated. Dc magnetic susceptibility measurements highlight ferromagnetic interactions between the metallic centres. The two Dy(III) and Yb(III)-based analogues display SMM behaviour. Experimental and theoretical magnetic and photo-physical investigations have confirmed that a multi-electroactive luminescent SMM is obtained in the case of the Yb(III) analogue. The first Dy(III)/TTF complex which exhibit a memory effect both in solid state and in solution will be also presented.

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