Georgetown University researchers have discovered a new class of strong magnets that do not rely on rare-earth or precious metals—a breakthrough that could significantly advance clean energy technologies and consumer electronics such as motors, robotics, MRI machines, data storage and smart phones.
A key figure of merit for a magnet is the ability of its magnetization to strongly prefer a specific direction, known as magnetic anisotropy, which is a cornerstone property for modern magnetic technologies.
Today, the strongest anisotropy materials for permanent magnets depend heavily on rare-earth elements, which are expensive, environmentally damaging to mine and vulnerable to supply-chain disruptions and geopolitical instability. For thin film applications, certain alloys of iron and platinum have become the materials of choice for next generation magnetic recording media, which contain precious metal platinum. Finding high-performance alternatives based on earth-abundant elements has therefore been a long-standing scientific and technological challenge.
A team led by professors Kai Liu and Gen Yin and graduate student Willie Beeson (G'25) in the Department of Physics at Georgetown University College of Arts & Sciences recently discovered a new type of strong magnets based on high entropy borides using earth-abundant transition metals and boron. The materials are both rare-earth-free and precious-metal-free, offering a compelling new strategy for sustainable magnet design. Their results are published in the journal Advanced Materials.
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