Building-size magnet shrunk to the palm of your hand in physics breakthrough

Researchers at ETH Zurich have compressed the magnetic strength of installations the size of small buildings into devices that fit in the palm of a hand, a leap that could change how scientists probe matter and pursue advanced energy research. The breakthrough uses high-temperature superconducting tape to create tiny, ultra-powerful magnets that promise to bring high-field techniques out of large national labs and onto benchtops.

These compact magnets open doors for faster, cheaper, and more widely available instruments for nuclear magnetic resonance (NMR) and other high-field applications — possibilities that until now required vast infrastructure, huge power plants, and tons of cooling hardware.

How the miniature high-field magnets were made

ETH Zurich engineers adopted a radically compact coil design built from REBCO (rare-earth barium copper oxide) superconducting tape. Instead of long solenoids or bulky windings, they wound the tape into flat, disk-shaped coils — often called “pancake” coils — and stacked those disks into a concentrated assembly.

Key design choices that enabled the shrink

• Using short lengths of REBCO tape reduced mechanical complexity and localized the magnetic field into a small volume.
• By avoiding joints, coil breaks, and internal insulation, the assemblies preserved uninterrupted superconducting pathways, minimizing losses.
• Compact geometry meant much less conductor material was needed compared with traditional large magnets.

When the team drove about 1,000 amps through these dense stacks of REBCO coils, the devices produced magnetic fields in the range of 38 to 42 tesla. That level of field strength previously required machines occupying tens of feet and consuming massive resources.

How these tiny magnets stack up against large facilities

The most powerful hybrid resistive magnet in the world — housed at the National High Magnetic Field Laboratory in Florida — generates roughly 45 tesla. But that comes at enormous cost and scale. The Florida installation, built in the late 1990s, required substantial capital and infrastructure that put it out of reach for most labs.

Typical resource footprint for a building-sized high-field magnet

• Construction cost in the order of $15 million
• Structural mass totaling dozens of tons and heights exceeding 20 feet
• Electrical cabling equivalent to enough copper to wire dozens of family homes
• Peak power consumption measured in the tens of megawatts
• Massive cooling needs: thousands of gallons per minute of water and several thousand liters of liquid helium to reach cryogenic temperatures (near -456° Fahrenheit)

By contrast, the ETH Zurich prototypes use a fraction of that material and space while still hitting fields close to the largest laboratory magnets — a dramatic shift in density and practicality.

Why REBCO tape and pancakes matter for compact high-field devices

REBCO is a high-temperature superconductor that carries huge current densities without resistance when cooled below its critical temperature. Its tape form factor lets engineers make tight, planar coils that concentrate magnetic flux where it’s most useful.

Technical advantages in plain terms

• High current capability: REBCO tapes support kiloampere-class currents in compact geometries.
• Low-loss operation: Eliminating joints removes common points of dissipation that force large magnets to consume extra power and require elaborate cooling.
• Scalable assembly: Pancake coils can be stacked, tested, and replaced individually, simplifying construction and maintenance.

Because the coils are small and electrically continuous, the ETH team achieved stable, repeatable fields without the enormous ancillary systems typical of conventional magnets.

Applications: from tabletop NMR to fusion research and beyond

Generating tens of tesla in a palm-sized device could democratize several technologies.

• Nuclear magnetic resonance (NMR): High-field NMR yields sharper, more detailed spectra for chemistry, structural biology, and materials science. Compact 38 T magnets could move high-resolution NMR out of centralized facilities and into university labs and industrial R&D benches.
• Fusion and plasma studies: Strong, localized magnetic fields are central to confinement and diagnostics; portable high-field sources could accelerate experimental work on smaller reactors and test stands.
• Advanced sensing and materials work: High magnetic fields enable exploration of exotic electronic and magnetic phases that are otherwise hard to access.

In initial tests, the team successfully performed NMR measurements using the 38-tesla device, suggesting that these miniaturized magnets can deliver real-world performance for demanding spectroscopy tasks.

Challenges and next engineering hurdles

While the prototypes are a major milestone, several practical issues remain before palm-sized high-field magnets become routine lab equipment:

• Cryogenics: Even compact superconducting assemblies need effective cooling strategies to keep REBCO within its superconducting regime.
• Mechanical stresses: Fields above 30 tesla produce substantial Lorentz forces that require robust structural design at small scales.
• Thermal stability and quench protection: Maintaining uninterrupted superconductivity and safely handling any transition back to resistive states are critical.
• Manufacturing yield: Producing defect-free REBCO tape and assembling many uniform, joint-free pancakes at scale will be a production challenge.

Despite those hurdles, the ETH Zurich results point toward a future where high-field magnetics are no longer confined to massive national labs. The authors of the study suggest that such compact, high-field magnets could make advanced NMR and similar technologies significantly more available around the world, transforming experimental workflows and expanding access to powerful magnetic-field-based methods.

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Michael Thompson

Michael Thompson is an experienced journalist covering U.S. and global news. With ten years on the front lines, he breaks down political and economic stories that matter. His precise writing and keen attention to detail help you grasp the real‑world impact of every event.