The World Won’t Run Out of Magnets-It Will Run Out of the Right Ones

Highlights

• Rare earth magnets (NdFeB and SmCo) are essential to EVs, wind turbines, defense systems, and robotics, with demand doubling since 2015 driven by electrification and AI infrastructure.
• High-performance magnets require dysprosium and terbium (often 8–11% in EV motors) to withstand extreme heat, creating a critical dependency that cannot be easily engineered away.
• China controls 90%+ of magnet production and heavy rare earth supply, with expanding export controls creating a bifurcated market where defense-grade magnets face severe qualification and supply constraints over the next 2–3 years.

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Rare earth magnets are the quiet engines of the modern world—permanent magnets made primarily from neodymium-iron-boron (NdFeB) and, in more specialized applications, samarium-cobalt (opens in a new tab) (SmCo). NdFeB dominates because it delivers unmatched magnetic strength for its size. SmCo, while more expensive, performs better under extreme heat and corrosion, making it essential for aerospace and defense.

These magnets sit at the heart of electric vehicle motors, wind turbines, robotics, data centers, MRI machines, speakers, and missile guidance systems. In simple terms, they convert electricity into motion with exceptional efficiency. That efficiency makes machines smaller, lighter, and more powerful—a defining advantage in everything from consumer electronics to national defense. The International Energy Agency reports (opens in a new tab) demand for magnet rare earths has roughly doubled (opens in a new tab) since 2015, driven by electrification, automation, and AI infrastructure.

Decoding the Magnet Code

Magnet grades like N35, N42, or N52 primarily reflect magnetic strength. The suffix—if present—signals temperature tolerance and resistance to demagnetization.

Rare Earth Magnet Grades — Performance, Heat, and Use Case

Magnet Grade	Temperature Tolerance	Relative Strength (Energy Density)	Typical Dy/Tb Content (wt.%)	Industries & Product Examples
High N (e.g., N48–N52, no suffix)	Up to ~80°C	Highest commercially common strength (maximum power density)	~0% (typically none)	Consumer electronics (headphones, speakers), toys, magnetic clasps, low-heat motors, and assemblies
No suffix (standard N grades, e.g., N35–N45)	Up to ~80°C	High strength (below N48–N52)	~0–1% (often none)	Consumer electronics (headphones, speakers), toys, magnetic clasps, low-heat motors and assemblies
Medium Temperature Grade (M)	Up to ~100°C	Moderate–high strength (slight tradeoff for heat tolerance)	(slight heat tradeoff)~1–2%	Electronics (hard drives), sensors, small motors, appliances, select medical devices
High Temperature Grade (H)	Up to ~120°C	Moderate strength (increased coercivity vs. base grades)	~2–3%	Industrial equipment, gauges, pumps, magnetic separation, factory automation
Super High Temperature (SH)	Up to ~150°C	Moderate strength with improved thermal stability	~3–5%	Automotive components (power steering), e-bikes, industrial motors, some wind turbine components
Ultra-High temperature grade (UH)	Up to ~180°C	Reduced strength relative to standard grades (heat-resistant design tradeoff)	~5–7%	High-performance motors, EV subsystems, wind turbine generators, robotics, select oil & gas applications
Extra High Temperature (EH) Advanced High Temperature (AH)	~200–220°C	Lower strength relative to high-N grades, but maximum thermal stability	~7–11% (can reach higher in extreme cases)	EV traction motors, hybrid drivetrains, aerospace systems (actuators), defense systems (missile guidance, radar)

Most high-performance applications rely on sintered NdFeB magnets. Bonded NdFeB is weaker but easier to shape, making it common in compact electronics.

The Dysprosium–Terbium Constraint

Here is where the story becomes strategic. Heavy rare earths—especially dysprosium (Dy) and terbium (Tb)—are added to magnets to maintain performance at high temperatures. They are the difference between a magnet that works in a smartphone and one that survives inside a jet engine or EV motor. There is a popular narrative that heavy rare earth content has fallen from ~12% to ~3.5–4%. That is partly true—but incomplete.

In reality:

• Lower-HREE designs exist, enabled by grain-boundary diffusion and better engineering
• But high-performance magnets—especially in EV drivetrains—still often require ~8–11% HREEs

 In short: efficiency gains are real, but physics still demands heavies at the highest performance levels.

Who Uses the Magnets

Magnets are often embedded inside finished goods—but the directional picture is clear:

• China: ~60% of global demand, ~90–94% of production
• Europe: ~16,000 tonnes annually, ~98% import-dependent
• United States: ~16 kt demand (2020), potentially >30 kt by 2030
• Japan: smaller volume (~12–13 kt historically), but highly specialized, high-performance production

China is not just the largest producer—it is the system.

What Happens Next

This is where the market tightens.

China controls:

• ~90% of rare earth processing
• ~90%+ of magnet production
• A dominant share of the heavy rare earth supply (alongside Myanmar)

Recent export controls now extend beyond raw materials to magnets, components, and even enabling technologies—including grain-boundary diffusion processes. That matters more than most appreciate. Because it means the West cannot easily “engineer around” the problem.

The Next Few Years: Scarcity at the Top End

For magnet makers, the implications are already emerging:

• Higher ex-China price premiums
• Redesign efforts to reduce Dy/Tb dependence
• Substitution into SmCo or ferrite where possible
• Accelerated recycling efforts (but this is hard to do)

And here’s the constraint: The highest-performance applications—EVs, aerospace, defense—cannot easily substitute.

And that is where the bottleneck concentrates. Estimates suggest non-China supply may meet only a fraction of heavy rare earth demand over the next decade.

Bottom Line (Expanded REEx View)

The magnet market is not constrained by how strong magnets can be made.

It is constrained by how many heat-resistant magnets can be produced—and that is ultimately a dysprosium and terbium problem.

The Coming Constraint: A Supply Chain Squeeze in Plain Sight

A tightening phase is now moving from theory to reality. China’s expanding export controls (granular licensing schemes, etc.) on heavy rare earths and related technologies—administered through its licensing regime and export rules—are increasingly drawing a hard line around dual-use applications, especially those tied to defense, aerospace, advanced motors, and high-performance computing systems.

These controls do not just restrict raw materials; they extend into magnets, components, and process know-how, making it far harder for Western manufacturers to source or substitute at scale.

At the same time, the West faces a structural gap: there is  no meaningful, scalable, and fully qualified heavy rare earth pipeline coming online in the next 24 months that can fully offset Chinese or Myanmar-linked supply. Even where separation capacity is emerging, the upstream heavies simply are not there in sufficient volume. This leaves magnet makers exposed—particularly for UH, EH, and AH grades, where Dy/Tb content is non-negotiable.

Compounding the issue, even credible non-China players such as Lynas Rare Earths will continue to rely in part on SEG+ sourced through Asian supply chains that may not meet DFARS origin requirements to balance supply. While commercially viable, these materials do not meet Defense Federal Acquisition Regulation Supplement (opens in a new tab) (DFARS) requirements, effectively excluding them from U.S. defense supply chains. That distinction—commercial access versus defense compliance—is where the market fractures.

The result is a bifurcating system:

• Commercial markets: constrained, higher cost, but still functioning
• Defense and strategic markets: increasingly supply-limited and qualification-bound

Even if magnets are made outside China, they still depend on China-controlled inputs or technology.

That’s the real choke point.

What This Means

Over the next two to three years, the world is unlikely to run out of magnets. It is increasingly likely to run short of the right magnets—the ones that can withstand heat, stress, and mission-critical environments. And those magnets depend on dysprosium and terbium—materials that remain scarce, controlled, and geopolitically sensitive.