Magnet Supply Chain

Neodymium-iron-boron (NdFeB) sintered permanent magnets are the most strategically exposed link in the critical materials chain. They are the enabling component in EV traction motors (a typical BEV uses 1-2 kg of NdFeB magnets), offshore wind generators (5-8 tonnes per turbine), and a wide range of precision defense systems. China controls approximately 90% of global NdFeB magnet production. There is no commercially viable substitute for high-performance NdFeB in these applications at comparable size, weight, and efficiency.

The Four-Step Chain

Light/Heavy RE Ore → NdPr/Dy/Tb Separation → NdFeB Alloy → Sintered Magnet
  [Mt Weld, Mountain Pass,    [China ~90%]      [China ~85%]   [China ~90%]
   Nolans, Bayan Obo]

The ore step has ex-China producers (Lynas, MP Materials, Arafura). The separation step has limited ex-China capacity (Lynas Estonia; Lynas Kalgoorlie; MP Mountain Pass). The alloy and magnet sintering steps are almost entirely in China. Two ex-China sintered NdFeB producers of note: Noveon Magnetics (US, existing small-scale) and MP Materials Texas (under construction, 10,000 t/yr target, 2028).

Key Claims

• China produces ~90% of global NdFeB magnets, a market worth $25B+ annually. Evidence: strong (CSIS, Jan 2026)
• Heavy rare earths (dysprosium, terbium) are the highest-risk input — they come almost exclusively from Chinese ion-adsorption clay deposits in Jiangxi, Fujian, and Guangdong. Evidence: strong (S&P Global, 2026)
• January 2026 export restrictions dried up dysprosium supplies to Japan, the only country outside China with significant sintered magnet manufacturing. Evidence: strong (S&P Global/Platts, Jan 2026)
• MP Materials' DoD partnership (groundbreaking Feb 2026, North Texas campus, 10,000 t/yr NdFeB): 100% DoD offtake, $1B construction financing from JPMorgan/Goldman Sachs, $150M DoD loan for Mountain Pass heavy RE separation, $110/kg NdPr price floor guaranteed. Evidence: strong (MP Materials investor releases, Feb 2026)
• Noveon Magnetics remains the only other US sintered NdFeB producer — its scale is small and commercially limited. Evidence: moderate (industry sources, 2025)
• Ex-China heavy-rare-earth (HREE) supply bottlenecks are forecast to persist through 2026 and 2027 as alternative suppliers are still being constructed and commissioned — supply cannot ramp fast enough to offset Chinese control in the near term. Evidence: moderate (S&P Global, Jan 2026, summary-derived)
• Magnet-manufacturing capacity additions are expected to come online around summer 2026 but are insufficient to close the HREE gap by year-end. Evidence: moderate (S&P Global, Jan 2026, summary-derived)
• Lynas produced the first ex-China dysprosium in May 2025 — an early, partial crack in the heavy-rare-earth monopoly, but not yet at the scale that closes the gap. Evidence: strong (CSIS, Apr 2026, full-text)
• The US whole-of-government magnet build-out runs well beyond MP Materials — Vulcan Elements ($620M DOD financing), USA Rare Earth ($1.6B CHIPS package), Ucore ($18.4M DOD, Louisiana), and HyProMag ($92M EXIM, magnet recycling, Texas) are all DOD/EXIM-backed legs of the same effort. Evidence: strong (CSIS, Apr 2026, full-text)
• Heavy-rare-earth feedstock remains a single point of failure, and the commercial scalability of alternative (ex-China) processing routes is still uncertain. Evidence: moderate (CSIS, Apr 2026, full-text)

Demand Drivers (2026-2030)

Critical Bottleneck: Heavy Rare Earths

Even if NdPr supply is secured from ex-China sources, dysprosium (Dy) and terbium (Tb) remain near-total Chinese monopolies. These heavy rare earths are used in small quantities to improve magnet coercivity (resistance to demagnetization at high temperature) in EV motors and MRI machines. Without Dy/Tb access, EV motor magnets underperform at high temperatures — requiring motor redesigns or operating limits. No significant ex-China Dy/Tb separation project is at commercial scale as of mid-2026.

Open Questions

• Will MP Materials' Texas facility achieve 10,000 t/yr by 2028, or face the construction cost overruns typical of first-of-kind plants?
• Can magnet grain-boundary diffusion techniques reduce heavy RE loading enough to sidestep the Dy/Tb chokepoint?
• How rapidly can Lynas' US processing plant (Kalgoorlie + Texas) build a Western separation chain for heavy REs?
• Will DoD's preferred-stock ownership of MP Materials create conflicts if production targets slip?

Related Concepts

• Processing Chokepoint — the structural context
• China Export Controls — the policy weapon targeting this chain
• Friend-Shoring and Stockpiles — Project Vault as bridging supply

Changelog

• 2026-06-15 — Initial compilation from MP Materials investor disclosures, CSIS, S&P Global/Platts (2025-2026)
• 2026-06-24 — Compiled new sources (csis-rare-earth-one-year-later, iea-export-control-supply-risks, sp-global-ree-bottlenecks-2026)