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Following the observation in 1993 of superparamagnetism on a molecule of [Mn1Z(OAc)18O11(HZO)5]·4HZO, [Mn1Z]1, now known as single-molecule-magnet, much advances have been made in elevating the blocking temperature, the barrier energy for magnetization reversal and the memory ability by widening the hysteresis loop through the design and syntheses of a wide range of multinuclear compounds of various metals of the periodic table.