Exchange-Spring Magnets

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Lemont, Illinois
Project Term:
01/01/2012 - 09/30/2015

Technology Description:

Argonne National Laboratory (ANL) is developing a cost-effective exchange-spring magnet to use in the electric motors of wind generators and EVs that uses no rare earth materials. This ANL exchange-spring magnet combines a hard magnetic outer shell with a soft magnetic inner core—coupling these together increases the performance (energy density and operating temperature). The hard and soft magnet composite particles would be created at the molecular level, followed by consolidation in a magnetic field. This process allows the particles to be oriented to maximize the magnetic properties of low-cost and abundant metals, eliminating the need for expensive imported rare earths. The ultimate goal of this project is to demonstrate this new type of magnet in a prototype electric motor.

Potential Impact:

If successful, ANL's exchange-spring magnets would be used to power an electric motor for use in wind generators and EVs using low-cost and abundant materials.


The U.S. produces a small fraction globally of industrial rare earths. Developing alternatives to the use of rare earths has the potential to reduce our dependence on these materials and will have a positive impact on our national economic and energy security.


The transportation and electric power sectors account for nearly 75% of U.S. greenhouse gas emissions each year. Better magnets would support the widespread use of EVs and wind power, significantly reducing these emissions.


The U.S. spends nearly $1 billion per day on imported petroleum. Improvements in magnet technology would enable a broader use of EVs, which would help insulate our economy from unexpected spikes in the price of oil.


ARPA-E Program Director:
Dr. Ji-Cheng Zhao
Project Contact:
John Hryn
Press and General Inquiries Email:
Project Contact Email:


Electron Energy Corporation
General Electric

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