Ferromagnetic Ordering and Simultaneous Fast Magnetization Tunneling in a Ni4 Single-Molecule Magnet

Low-temperature heat capacity and oriented single-crystal field-cooled and zero-field-cooled magnetization data for the single-molecule magnet [Ni(hmp)(dmb)Cl](4) are presented that indicate the presence of ferromagnetic ordering at approximately 300 mK, which has little effect on the magnetization relaxation rates.