Why is samarium considered strategically important?

Samarium-cobalt magnets retain performance at high temperatures, making them essential for missile guidance, fighter jets, and satellites where substitutes underperform.

Who controls samarium supply?

China dominates global mining, separation, and magnet manufacturing for samarium and most other rare earths, giving it leverage in trade and security disputes.

Is samarium actually rare?

Like most rare earths, samarium is relatively abundant in the earth's crust but is rarely found in concentrated, economically extractable deposits, and separation from other lanthanides is chemically difficult.

Samarium: A Key Rare Earth Element

Samarium is one of the 17 rare earth elements and sits in the lanthanide series of the periodic table. Its political-economic importance derives almost entirely from samarium-cobalt (SmCo) permanent magnets, which retain magnetic strength at high temperatures and are used in precision-guided munitions, fighter aircraft (including the F-35), missile guidance systems, satellites, and certain medical devices. Samarium isotopes also have niche applications in cancer therapy (samarium-153) and nuclear reactor control rods.

The strategic concern around samarium is concentration of supply. China dominates global mining, separation, and processing of rare earths, including samarium, and controls the bulk of downstream magnet manufacturing. This has made samarium a recurring subject in debates over critical mineral supply chains, export controls, and industrial policy in the United States, European Union, Japan, and Australia.

Several policy moments are relevant:

In April 2025, China's Ministry of Commerce imposed export licensing requirements on seven rare earth elements including samarium, gadolinium, terbium, dysprosium, lutetium, scandium, and yttrium, in response to US tariff measures. The restrictions disrupted defense and automotive supply chains globally.
The US Defense Production Act has been invoked to fund domestic rare earth separation capacity, and the Department of Defense has issued awards to firms such as MP Materials and Lynas USA.
The EU Critical Raw Materials Act (entered into force 2024) lists rare earth elements as both critical and strategic, setting benchmarks for domestic extraction, processing, and recycling by 2030.

Because samarium-cobalt magnets are difficult to substitute in high-temperature defense applications—neodymium-iron-boron magnets degrade above roughly 150°C without heavy rare earth additives—samarium occupies a disproportionately sensitive position relative to its small market size. Analysts frequently cite it alongside dysprosium and terbium as a chokepoint mineral in US–China strategic competition.

Several policy moments are relevant:

In April 2025, China's Ministry of Commerce imposed export licensing requirements on seven rare earth elements including samarium, gadolinium, terbium, dysprosium, lutetium, scandium, and yttrium, in response to US tariff measures. The restrictions disrupted defense and automotive supply chains globally.
The US Defense Production Act has been invoked to fund domestic rare earth separation capacity, and the Department of Defense has issued awards to firms such as MP Materials and Lynas USA.
The EU Critical Raw Materials Act (entered into force 2024) lists rare earth elements as both critical and strategic, setting benchmarks for domestic extraction, processing, and recycling by 2030.

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Frequently asked questions

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