However, the E-core
coil uses the soft magnetic material, which has magnetic hysteresis  between the magnetic field H and the bulk magnetic flux density B, and the typical B-H curve is illustrated in Figure 3.
Tapering the E-core
fiber changes the V-number as well as the sensitivity of the sensor along its length.
These inductors are wound using very thick helical coils on Sendust powder E-core
construction, with distributed air gaps using ceramic binders.
The inductors use a shielded E-core
package, allowing for exceptional heat dissipation and desirable EMI shielding.