Samarium's Critical Role Powering Next-Generation Military Propulsion

Samarium stands apart among the 17 rare earth elements due to its exceptional thermal stability, positioning it as a cornerstone material for America's most advanced military platforms. Unlike neodymium-iron-boron magnets that lose their magnetic properties at high temperatures, samarium-cobalt (SmCo) magnets remain stable in extreme heat environments critical to modern defense systems.

The F-35 Lightning II fighter jet exemplifies samarium's strategic importance in contemporary warfare. Each aircraft contains approximately 50 pounds of SmCo magnets distributed throughout engine turbomachines, pumps, and power systems. The fighter requires over 900 pounds of rare earth materials total, with samarium-cobalt addressing the specific thermal demands that no alternative material can match at equivalent performance levels. Defense contractor Lockheed Martin has become the largest U.S. consumer of samarium, reflecting the element's critical necessity in fifth-generation aircraft development.

Beyond fighter aviation, samarium serves equally vital functions in naval propulsion and thermal management systems. Virginia-class submarines incorporate extensive rare earth magnets in their electric drive propulsion motors, with SmCo magnets handling high-temperature environments where propulsion efficiency directly impacts operational capability. Similarly, the Navy's emerging Columbia-class submarines are expected to utilize even more magnet-rich systems, further increasing samarium demand across the fleet.

The broader defense industrial base consumed 3,000 to 4,000 tons of rare earth magnets annually as of 2025, with samarium representing a concentrated demand segment for high-temperature military applications. Procurement plans for hundreds of additional F-35s over the coming decade, combined with new B-21 stealth bombers and advanced drone platforms, will substantially increase samarium consumption.

However, America faces a critical vulnerability: China refines over 85 percent of the world's rare earths and produces nearly 90 percent of high-performance rare earth magnets. When China tightened export controls on seven rare earth elements in April 2025, it directly threatened samarium supply chains feeding defense contractors. The Department of Defense currently relies on finished or near-finished samarium-cobalt magnets from potentially unreliable sources, creating a national security exposure that existing raw ore stockpiles cannot address.

The rare earth elements market, valued at USD 4.20 billion in 2025 and projected to reach USD 10.51 billion by 2036, reflects structural demand growth where no commercially viable substitute exists. Samarium's irreplaceability in military thermal applications ensures its strategic premium within this expanding market, making supply chain diversification and domestic processing capacity development essential priorities for sustained U.S. defense capabilities.