Spin flop transition in the substituted Mn-porphyrin magnet [Mn(OC12H25)(4)TPP][TCNE]*2PhMe

The modificated Mn-porphyrin magnet [Mn(OC12H25)(4)TPP] [TCNE]* solvent ord ers ferromagnetically at T-c = 22 K, Close to T-c transition to the spin gl ass-like state occurs. The coercive field H-c at T = 2.3 K equals 21 kOe bu t decreases quickly with temperature. In the paper the low temperature magn etization curves are investigated. The observed field induced magnetization jump we identify as the spin flop which is the transition from the longitu dinal to the transverse spin glass state. The transition may come from the sign change of the anisotropy constant. The critical field for the transiti on decreases with temperature and equals zero for T > 7.5 K. Above 7.5 K ma gnetic uniaxial anisotropy is lost and a single ion anisotropy favours the ferromagnetic ordering of spins.