Plot of the relative observed moment as a function of the length of the sample. The empirical polynomial fit is of the form .
Sample is pressed into a cylindrical shape into the first straw and held in place by two inner straws.
The effect on the diamagnetic slope due to the size of the gap in the inner straw. The solid symbols show the hysteresis curve for freeze-dried mouse brain tissue which was packed down to and a gap of the same size. The open symbol shows the hysteresis curve for a different sample which was packed down to and a gap of the same size.
Plot of the linear slope, mainly diamagnetic, and antidiamagnetic contribution, as a function of the ratio of the gap length over the wet mass of the sample. The slope would vanish for a gap over a mass ratio of .
Typical raw data from a SQUID magnetometer for a magnetically dilute biological sample; in this case mouse brain tissue, measured at .
Hysteresis curve measurements of a mouse brain tissue sample (as in Fig. 5) where a diamagnetic slope of has been subtracted. Measurement (a) gives the best result and was done in no-overshoot mode with waiting time. Measurement (b) is no-overshoot mode with waiting time. Measurements (c) and (d) were done in hysteresis mode and in oscillate mode, both with a waiting period.
Error bar analysis of the hysteresis curve measurements of Fig. 6. The error was averaged over the four points of the same absolute field and was further averaged at low field between 0–1, 1–2, and for clarity purpose. Measurements (a) and (d) give the best result and are similar. Measurements (b) and (c) give the worst error bar as expected.
Percentage error of the magnetization. Measurement (a) was done in no-overshoot mode with waiting time. Measurement (b) is no-overshoot mode with waiting time. Measurements (c) and (d) were done in hysteresis mode and in oscillate mode, both with a waiting period.
Article metrics loading...
Full text loading...