One of the foremost engineering hurdles in apparel magnetics is stray magnetic flux. Unshielded hardware magnets create localized fields that cause coats to cling to steel chairs or demagnetize hotel keycards. magtech® overcomes this through single-side multi-pole magnetization and ferromagnetic back-flux containment.

1. The Halbach and Concentric Bullseye Array Principle

Rather than simple dipolar through-thickness magnetization, magtech® concealed snaps feature concentric multipole tracks. Alternating annular north and south zones loop magnetic flux lines tightly across the mating boundary, sharply boosting close-range attraction while causing the external field to decay exponentially.

2. Field Decay Rate ($1/r^3$ Dynamics)

Through finite element method magnetics (FEMM) modeling, our bullseye array reduces stray field leakage to below 5 Gauss at an exterior distance of merely 4 mm. This ensures that credit cards, smartphones, and magnetic storage media remain safe even when placed in adjoining outer pockets.

3. Back-Shunt Ferromagnetic Shielding

For high-intensity bar snaps, a micro-thin permalloy or high-permeability soft iron back-plate absorbs leakage vectors on the outward-facing side, redirecting lines of flux inward to enhance forward clamping force by up to 28%.

Access electromagnetic finite element simulations and gauss distribution plots at magtech.global.