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Dictionary / Coverage & Falloff

Gradient Rate (G/mm)

Coverage & Falloff
How quickly the field changes across the surface, given as the steepest drop between adjacent scan points in Gauss per millimeter. A steep gradient marks a tightly focused hot spot; a gentle one means the field spreads smoothly outward.

Also known as: Gradient, Field Falloff

Field strength peaks at the coil center and falls off with distanceA symmetric bell-shaped curve with its peak in the middle: the magnetic field is strongest at the coil center and weakens with distance in either direction. Using the on-axis dipole model, the field drops to 50 percent of its peak at about 0.77 coil radii from center and to 10 percent at about 1.93 coil radii.100%50%10%Peak50% at 0.77 R10% at 1.93 R3 R2 R1 Rcenter1 R2 R3 RDistance from center (multiples of coil radius R)Field strength (% of peak)© 2026 Gauss Labs
The field is strongest right at the coil and weakens with distance in every direction. On the on-axis dipole model the report uses, it reaches half its peak strength at about three quarters of a coil radius from center and one tenth at about two radii. A larger coil holds the field up farther out.
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