A very-high-sensitivity magnetometer is described in detail. The sensitivity of the apparatus is typically of the order of 10−9 A cm2/(Hz)1/2, so that changes in magnetic moment of 10−10 A cm2 can be detected. The magnetic moment can be calculated by simulation of the measurement system. An example of a hysteresis loop is shown. The size of the sample is determined by electron microscopy. The physical limits of the measurement system are worked out and discussed.
"The patient himself did not eat anything during this evening and since everybody knew that the patient was allergic to peanuts, the peanuts were put away and not eaten in front of him."