Who makes rare earths & permanent magnets for AI data centers

Neodymium-iron-boron and similar rare-earth magnets are what make small, powerful, efficient motors possible — the motors inside server and rack fans, CRAH and fan-wall units, CDU and cooling-loop pumps, and the alternators and starter systems on backup generators and gas turbines (Layers 4, 5, 6, 7). The chain runs from mined and separated rare-earth oxides through magnet manufacturing, a step that has historically been concentrated in a small number of countries and companies. Data centers are not the largest buyer of rare-earth magnets — that's still autos and wind — but AI infrastructure adds motors in places legacy IT didn't need them (liquid-cooling pumps, denser fan arrays) and draws on the same tight magnet-supply base that other electrified end markets are pulling from. Governments in multiple regions have pushed to build alternative separation and magnet-manufacturing capacity outside the traditional supply base, and some fan and motor makers are qualifying reduced-rare-earth designs as a hedge. For investors, the relevant signals are the pace of non-traditional separation and magnet capacity coming online, magnet-maker qualification cycles with data-center-relevant component makers, and how exposed a given fan, pump or genset supplier is to a single magnet source.