Room-temperature magnetic bistability in organic radical crystals

A Large first-order magnetic phase transition in an organic radical, 1,3,5- trithia-2,4,6-triazapentalenyl. is described. The transition occurs with a wide thermal hysteresis Loop over the temperature range 230 to 305 kelvin. The high-temperature phase is paramagnetic, and its structure consists of a uniform one-dimensional stacking of the radical. The Low-temperature phase is diamagnetic because of strong dimerization along the stacking direction . The results may have applications in thermal sensors, switching units, an d information storage media based on organic radical crystals.