Given that we’re going over the basics to give a good foundation, I thought I’d mention the mass problem.
To be an effective sensing magnet, the magnet needs to have a high field strength, which is why N52 grade magnets are used. And, it also needs a low mass, so that it can move easily back and forth when exposed to a field.
This basic concept is the root of the coating problem. You can make high strength magnets, and you can safely coat them. But a SAFE coating ends up being so thick that the overall mass get too heavy and dampens the motion out.
The ideal magnet would be:
- Small / Light
- Magnetically powerful
- Extremely bio-safe.
Right now, you can have any 2 of the 3. Which just won’t cut it.
The M31 of old, was small and powerful. It had good sensing properties. It would also break down the coating in the body and turn into magnetic rust.
The Current xG3 (lifting magnet) is Powerful and biosafe (glass coating) But physically largeish and mass-y. The mass dampens out the feel. Some people report some sensing with it, but it’s far far from useable in that regard as a sensing magnet.
This issue (coating safety vs mass) is the one thing that I think really stops development. Crack that code and sensing magnets will probably make a comeback. However, this is gonna be tough.