Bob Johnson Associates - Micro-Magnets

We can provide magnets in Neodymium Iron Boron, SmCo, Alnico, or any other magnetic material, and offer coatings and platings that are biocompatible, including Parylene, and Titanium cases.

One of our most technologically sophisticated magnets is a Micro-Magnet™ designed for a medical application. This magnet is offered in Neodymium Iron Boron with energy products up to 52 MGOe, and coated with an inert biocompatible protective coating.

A photograph of just a few of our micro-magnets™, with a sewing needle for scale. The eye of the needle is only 0.07” [1.78 mm] long x 0.017” [0.43 mm wide]. The lower right magnet will easily pass through the eye of the needle.

2:17 Type SmCo Magnet sitting on a US Dime! This magnet measures 1.60 mm square x 0.42 mm thick.

2:17 SmCo magnet on a US Penny for scale. This magnet measures 1.60 mm in outside diameter x 0.041 mm inside diameter x 0.040 mm in thickness.

In addition to medical applications, other uses include micro sensors for use with Hall Effect Chips, and reed switches, wrist watch movements, and micro motor designs.

Micro-Magnets™

BJA Magnetics manufacturers Micro-Magnets™ for a number of applications. These include industries as diverse as Medical Applications, Medical Devices, Micro Motors, and Sensors.

The diameter can be supplied as small as 0.010” [0.25 mm], with tolerances after coating or plating as tight as ±0.0003” [±0.008 mm], depending upon material.