Few genuine organic bulk-ferromagnets have been synthesized until now, but their transition temperatures (Tc) do not exceed 1.5 K. The representative organic bulk-ferromagnets such as β-phase p-NPNN (Tc = 0.61 K) and p-Cl-C6H5CH=N=TEMPO (Tc = 0.28 K) show a ferro-to-antiferromagnetic transition under pressure. In 2,5-DFPNN (Tc = 0.48 K), however, we find that ferromagnetism is stable even under pressure, and Tc increases with pressure. This result gives us a clue for realizing the high-temperature organic bulk-ferromagnet.
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