China controls roughly 70% of rare-earth mining, 90% of processing, and 93% of magnet manufacturing worldwide -- and even with its broadest December 2025 export-licensing rules currently suspended, a narrower regime already puts every high-performance permanent-magnet motor, including the ones inside eVTOL propulsion units, inside a compliance perimeter.
# The Magnet Problem Nobody Certifies For
eVTOL propulsion depends heavily on permanent-magnet motors, typically built with neodymium-iron-boron magnets doped with heavy rare earths like dysprosium and terbium to hold their magnetic strength at high operating temperatures. That dependency now sits inside a tightening geopolitical chokepoint.
## What changed
China controls an estimated 70% of global rare-earth mining, roughly 90% of processing capacity, and about 93% of permanent-magnet manufacturing. Export-control rules that would have taken effect December 1, 2025 extended China's licensing regime to cover magnets containing even trace amounts, as little as 0.1% by the stated heavy-rare-earth threshold, of Chinese-origin material or made using Chinese processing or manufacturing technology, regardless of where final assembly happens, with automatic license denial for companies affiliated with foreign militaries. China suspended those rules on November 7, 2025 as part of a US-China trade truce, with the suspension set to run through November 10, 2026. What's actually in force today is a narrower regime dating to April 2025 that requires case-by-case export licenses for seven specific medium and heavy rare earths, including dysprosium and terbium.
## Why eVTOL propulsion is exposed
Distributed electric propulsion architectures multiply the number of individual permanent-magnet motors per aircraft rather than reducing it: each rotor typically has its own motor, and each motor needs its own set of high-performance magnets. That's more units per aircraft touching a constrained material, not fewer. Motor suppliers across the industry have already reported production slowdowns during earlier, narrower rounds of Chinese export restrictions.
## The available responses
The industry's options are the same ones facing defense and EV manufacturers: qualify non-Chinese magnet suppliers, redesign motors to use less heavy-rare-earth-dependent magnet formulations or topologies that avoid permanent magnets entirely, or absorb longer lead times and higher costs while supply diversifies. None of these are fast fixes: new magnet production capacity and requalification of motor designs against a new supplier both run on multi-year timelines, longer than most eVTOL developers' current certification runways.
Not investment advice -- for informational and technical-analysis purposes only.
