Polycrystalline samples of [Dy(Dtp) 2 ][Al{OC(CF 3 ) 3 } 4 ] secured in eicosane were prepared as described above, and loaded into a straw that was fixed to a translucent glassreinforced polycarbonate adaptor attached to a carbon-fibre rod. To evaluate when the zero-field condition is reached and which method of data collection (vibrating-sample magnetometer (VSM) or DC modes), short magnetisation decay measurements were performed at 13 K. The sample was first cooled in zero-field then magnetised at +7 T for 30 minutes before the field was swept to the calibrated target of +23 Oe at 700 Oe/s, and held for 15 mins. The field and field status (stable or sweeping) were recorded at 0.25 s intervals using the logging function. This field sequence was repeated for each of the following settings: VSM mode with a peak amplitude of 1 mm and averaging time of 0.5 s with either sticky autorange or fixed range settings; or DC mode with fixed range, a 30 mm scan length and either 1 or 4 s scan time. For each measurement method, we examined both continuous measurement throughout the field sequence, or measurement only after stable field was achieved.