It would be cool to read the magnetic field of the cores directly. The first problem is you'd essentially destroy the core stack disassembling it to get at the

It would be cool to read the magnetic field of the cores directly. The first problem is you'd essentially destroy the core stack disassembling it to get at the planes and expose the cores. The second problem is the cores are sub-millimeter sized, so you'd need a fairly high resolution probe. I think a typical Hall effect sensor would be too big, and a magnetic-force microscopy probe would be too small. But if anyone knows of a probe that work work, please let me know.