Pressure-Induced Transition from an Antiferromagnet to a Ferrimagnet for MnII(TCNE)[C4(CN)8]1/2 (TCNE = Tetracyanoethylene)

MnII(TCNE)[C4(CN)8]1/2 (TCNE = tetracyanoethylene) exhibits a reversible pressure-induced piezomagnetic transition from a low magnetization antiferromagnetic state to a high magnetization ferrimagnetic state above 0.50 ± 0.15 kbar. In the ferrimagnetic state, the critical temperature, Tc, increases with increasing hydrostatic pressure and is ∼97 K at 12.6 kbar, the magnetization increases by 3 orders of magnitude (1000-fold), and the material becomes a hard magnet with a significant remnant magnetization.