Abstract
The transition to ferromagnetic order was realized in 1991 with the discovery of a p –nitrophenyl nitronyl nitroxide (C 13 H 16 N 3 O 4 ) crystal. This was the first example of a ferromagnet without metal elements. Its ferromagnetism below the transition temperature of 0.6 K has been established by various experiments such as susceptibility, magnetization, heat capacity, zero–field muon spin rotation, neutron diffraction and ferromagnetic resonance measurements. Details of the results of these experiments are described in this paper.
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