Surface Laser Architected Magnets (SLAM)

Default ARPA-E Project Image

OPEN 2021
Malibu, California
Project Term:
08/29/2022 - 08/28/2025

Technology Description:

HRL Laboratories’ surface laser architected magnets (SLAM) approach can reduce the use of HRE by locally optimizing the crystallographic orientation of the microstructure on the magnet’s surface. Using laser-based post-processing methods, SLAM magnetically hardens the weakest points on a NdFeB magnet surface against demagnetization, which enables higher torque and more energy efficient motors. By increasing demagnetization resistance, the extent of usable magnetic energy produced at elevated operating temperatures can be increased up to 2X in permanent magnets. Magnet and motor size and mass can be reduced, saving HRE material and motor costs. These magnets will increase motor efficiency, and thereby accelerate the adoption of electric ground and air vehicles, reduce energy demands and greenhouse gases, and reduce the need for non-domestic rare-earth elements.

Potential Impact:

HRL Laboratories and General Motors will develop magnets with double the energy product of state-of-the-art NdFeB magnets at elevated operating temperatures by tailoring magnet surface architecture to resist demagnetization, which will result in increased efficiency electric motors.


Recycled heavy rare earth (HRE) helps to create a resilient U.S.-based energy infrastructure.


Higher-temperature magnets extend a motor range by 9-14%, thus reducing overall energy demands and greenhouse gasses.


SLAM magnets would allow motor manufacturers to reduce motor cost and mass to accelerate adoption of electric ground and air vehicles.


ARPA-E Program Director:
Dr. Philseok Kim
Project Contact:
Mr. Brennan Yahata
Press and General Inquiries Email:
Project Contact Email:


General Motors

Related Projects

Release Date: