Weaker hard ferrite (iron-oxide) permanent magnets typically max out at around 0.35 tesla. The world's strongest permanent magnets made of neodymium measure around 1.4‑1.6 teslas. Niron’s ...

“At that time, all these motors used ferrite magnets ... of neodymium–iron–boron permanent magnets has allowed the miniaturization of motors and hard disk drives, drastically reducing ...