Magnetic properties of a novel molecule-based ferrimagnet exhibiting multiple magnetic pole reversal

The magnetic properties of a new molecule-based ferrimagnet containing thre e different spin sources have been studied. Below the magnetic ordering tem perature, the magnetic poles reverse once in a small external field as the temperature varies. At a higher field, they reverse twice at temperatures t hat depend on the measurement process. A double thermal hysteresis is obser ved in a constant field. These experimental results can be rationalized by a combination of the molecular-field theory (MFT) and magnetic anisotropy. (C) 2001 Elsevier Science BN. All rights reserved.