Brown Thin Film Keeps Magnetism at Atomic Scale

Researchers at Brown University grew bismuth ferrite films only a few angstroms thick that still hold ferroelectric and magnetic properties.

Updated on Nov. 1, 2026 in Materials Science

Close view of a thin crystalline film on a dark substrate inside a steel vacuum chamber, lit by soft cool daylight. — Brown University researchers grew bismuth ferrite films only a few angstroms thick that still hold magnetic and ferroelectric properties, overcoming the dead-layer barrier that has limited thin multiferroics. AI Illustration. Upload story photo >

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Brown University researchers developed a method for producing ultrathin bismuth ferrite films that retain both ferroelectric and magnetic behavior. The team also demonstrated altermagnetism in the engineered film, published in Nature Materials on October 28, 2026.

Why it matters

Thin multiferroic films normally lose their electrical and magnetic behavior due to the dead layer effect, which has limited their use in electronics. The Brown approach addresses this barrier, which matters for Rhode Island's research community and for future component design.

The engineered film remained functional at thicknesses of a few angstroms, roughly four billionths of an inch per angstrom, using compressive strain from a dysprosium scandate substrate. The study has not yet produced a finished computing device, so real-world performance remains unverified.

The players

Brown University

A private research university in Providence, Rhode Island, whose researchers developed the thin-film growth technique.

The details

The researchers grew bismuth ferrite on dysprosium scandate, a substrate with a smaller lattice spacing that places the film under compressive strain. They also incorporated a metallic layer to screen unwanted electric fields that would otherwise destabilize polarization in the ultrathin film.

October 28, 2026: Nature Materials publishes the study demonstrating the engineered bismuth ferrite and altermagnetism.

Paradigm Shift

For years, the dead layer effect has constrained multiferroic films, which lose ferroelectric and magnetic behavior when made extremely thin. The Brown team's compressive-strain and screening approach directly addresses that constraint, opening a path toward denser electronic components.

Altermagnetic properties could eventually support faster, more densely packed electronic components while reducing energy consumption. Commercialization timelines remain undetermined, as the technique has not yet produced a finished device.

The takeaway

Overcoming the dead layer effect is a key step toward thin multiferroic components, and readers tracking materials science should watch for device-level demonstrations that follow this proof of concept.