Handbook of Magnetic Measurements

90 Handbook of Magnetic Measurements

Another arrangement of magnets was proposed by

Cugat et al. (1994) (Figure 2.160b). A set of four rod

magnets when rotated can create the variable magnetic

eld depending on the angular position of the mag-

nets (magic mangle), enabling to change the value and

direction of the uniform magnetic eld from −0.2 to

+0.2 T.

Figure 2.161 presents the examples of a magnet array

generating uniform magnetic eld over a large area

(used in magnetic resonance devices in medicine) and

at the same time practically cancellation of external

stray magnetic eld. This conguration realizes t ...