Handbook of Magnetic Measurements

184 Handbook of Magnetic Measurements

is to use external sense coil (Figure 4.58b). Because a cir-

cular ring core has a larger demagnetization factor in

comparison with a double-rod design, as a compromise

also racetrack (oval) design was proposed (Gordon et al.

1965, 1968, Ripka 2000a,b). One of the advantages of the

racetrack design is lower sensitivity to perpendicular

elds.

Indeed, the ring-core design (Figure 4.59) is easier to

manufacture than the double-rod sensor. But the main

advantage of the ring-core sensor is its much smaller

power consumption necessary to magnetize the closed

sample to saturation, which is importa