Physics Just Went Palm-Sized: Handheld Magnets Hit Game-Changing Power

Imagine holding something in your hand that packs the magnetic punch of a building-sized machine. That’s no longer science fiction—it’s happening in laboratories at ETH Zurich, where researchers just pulled off what sounds like something Tony Stark would dream up.

Scientists from the Department of Chemistry and Applied Biosciences at ETH Zurich have created two miniature superconducting magnets, each smaller than 2.5 inches in diameter, that generate magnetic fields of 38 and 42 tesla respectively. For perspective, the world-record holding hybrid resistive magnet at the National High Magnetic Field Laboratory in Florida produces 45 tesla—but that machine cost $15 million to build, weighs 35 tons, stands 22 feet high, and demands 33 megawatts of power plus 4,000 gallons of water every minute just to keep running. Oh, and it needs 2,800 liters of liquid helium to stay cold at -456° Fahrenheit.

The trick? Engineers wound flat REBCO tape (rare earth barium copper oxide) into disk-shaped coils called pancakes and stacked them together. The compact design eliminated joints, breaks, and insulation losses that plague traditional setups—meaning less power drain, less cooling overhead, pure magnetic efficiency. When they pumped 1,000-amp currents through these densely packed coils, the result was field strength that rivals decades-old behemoths.

The real-world payoff is enormous. Nuclear magnetic resonance, or NMR, is a high-tech method for examining sub-atomic particles—the kind of work that currently requires those massive, expensive installations. The ETH Zurich team already demonstrated that their 38 tesla magnet could perform NMR work, suggesting these mini-mega magnets could make cutting-edge magnetic resonance technology accessible worldwide and enable breakthrough applications in nuclear fusion and beyond. What once required an entire building’s worth of infrastructure, cooling systems, and power grids could soon sit on a laboratory tabletop.

This is the kind of breakthrough that doesn’t just improve existing tools—it fundamentally changes what’s possible. When you shrink the barrier to entry by orders of magnitude, you open doors that were previously locked. And that’s when innovation accelerates.