# Permanent Magnets and the Rare-Earth Supply Chain The most important materials most people have never heard of may be the rare-earth permanent magnets — small, powerful magnets, mostly **neodymium-iron-boron (NdFeB)**, that sit inside an astonishing range of modern machines. They are what make an electric-vehicle motor compact and efficient, what spins inside a wind turbine, and what aims and actuates the control surfaces of precision-guided weapons. A single F-35 fighter contains hundreds of kilograms of rare-earth materials; an EV traction motor depends on a few kilograms of magnet that has no good substitute. These magnets are the point where the abstract category of [[Critical Minerals]] becomes a specific, irreplaceable, China-controlled component — and in 2025 they became the single most powerful piece of leverage in the US–China trade war. ## What Makes Them Strategic The magnetism comes from rare-earth elements — particularly neodymium, praseodymium, and, for high-temperature performance, the "heavy" rare earths dysprosium and terbium (see [[Rare Earth Elements]] for the elements themselves). Rare earths are not actually geologically rare, but they are dispersed, hard to separate from one another, and environmentally nasty to refine. The strategic vulnerability is not in mining but in **processing and magnet-making**, which China has concentrated almost entirely: China controls roughly 90% of the world's rare-earth refining and the overwhelming majority of finished NdFeB magnet production. Decades of Western offshoring, undercut by Chinese state subsidy and lax environmental enforcement, hollowed out the allied supply chain. The result is the same processing chokepoint documented for Lithium and Battery Materials, but even more concentrated and harder to reshore. ## RWKB Angle: The Magnet as a Weapon of Economic Statecraft **The 2025 escalation.** Rare-earth magnets became the centerpiece of China's response to the second Trump administration's tariffs. On **April 4, 2025**, China's Ministry of Commerce imposed export controls on seven medium-and-heavy rare earths (including dysprosium and terbium — precisely the elements that make magnets work in hot environments like motors and munitions), requiring case-by-case MOFCOM licenses. On **October 9, 2025**, Beijing escalated dramatically with Announcement No. 61, adding more elements and — for the first time — adopting a **foreign direct product rule** (the 0.1% rule): any magnet made *anywhere* in the world using Chinese rare earths, Chinese processing, or even Chinese magnet-making technology would require Chinese approval to export. This was a deliberate mirror of the very mechanism Washington had used to choke off [[Semiconductor]] exports to China — China demonstrating it could play the extraterritorial export-control game too. **Leverage, then restraint.** As part of a trade truce reached at the Busan summit, China **suspended the October expansion on November 7, 2025** (for one year, to November 2026), while keeping the April controls and the licensing infrastructure in place. The pattern is the vault's key insight about rare earths as statecraft: China showed it could halt allied defense and auto production at will, extracted concessions, and then eased off — demonstrating leverage rather than firing the weapon outright. The licensing architecture remains built and ready, which is itself the point. Magnets are now a permanent pressure point, not a one-time shock. **The scramble to rebuild.** The crisis supercharged Western efforts to rebuild a non-Chinese magnet supply chain: MP Materials (Mountain Pass, California) restarting domestic mining and refining and building magnet capacity, often with [[Defense Production Act]] funding and Pentagon offtake guarantees; allied projects in Australia, and processing in Japan and Europe. But rebuilding refining and magnet-making takes years and runs into the same problem that offshored it in the first place — the [[EPA]]-style environmental cost of rare-earth processing, which the US largely exported to China decades ago and is now reluctant to re-internalize. The magnet supply chain is the cleanest case in the folder of a deliberate, decades-long offshoring decision creating a strategic dependency that cannot be quickly undone. **The political scramble.** Rare-earth magnets are one of the rare materials issues with genuine bipartisan urgency — both a [[Defense Tech Ecosystem]] survival question and an EV/clean-energy question — which is why magnet reshoring survives even as the climate rationale around it is contested. It also drives some of the era's stranger geopolitics: the interest in Greenland, Ukraine's mineral deals, and deep-sea mining all trace partly to the search for rare earths outside Chinese control. ## See Also - [[Materials Science]] — parent hub - [[Critical Minerals]] — the broader strategic-minerals frame - [[Rare Earth Elements]] — the elements themselves (Terminology) - [[Defense Tech Ecosystem]] — magnets in precision weapons - Lithium and Battery Materials — the parallel China-processing chokepoint - Gallium, Germanium, and Compound Semiconductors — the other half of China's 2024–25 export-control arsenal - [[Defense Production Act]] — the tool funding domestic magnet capacity