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We report the magnetic field dependent dc magnetization and thepressure-dependent (pmax ~ 16 kbar) ac susceptibilities Xp(T) on both powderand bulk multiferroic BiMnO3 samples, synthesized in different batches underhigh pressure. A clear ferromagnetic (FM) transition is observed at TC ~ 100 K,and increases with magnetic field. The magnetic hysteresis behavior is similarto that of a soft ferromagnet. Ac susceptibility data indicate that both the FMpeak and its temperature (TC) decrease simultaneously with increasing pressure.Interestingly, above a certain pressure (9 ~ 11 kbar), another peak appears atTp ~ 93 K, which also decreases with increasing pressure, with both these peakspersisting over some intermediate pressure range (9 ~ 13 kbar). The FM peakdisappears with further application of pressure; however, the second peaksurvives until present pressure limit (pmax ~ 16 kbar). These features areconsidered to originate from the complex interplay of the magnetic and orbitalstructure of BiMnO3 being affected by pressure.

Anomalous pressure effect on the magnetic ordering in multiferroic BiMnO3