Chinese scientists have discovered ultratiny, "linear" boundaries inside three-dimensional crystals that could eventually allow a postage stamp-sized chip to store 10,000 high-definition movies.

The study, published in the journal Science on Friday, suggests that these structures — measuring one hundred-thousandth of the diameter of a human hair — could lead to artificial intelligence chips hundreds of times more powerful and energy-efficient than those available today.

To understand the discovery, imagine the interior of a ferroelectric crystal — a common material used in electronics — as a 3D grid, similar to a Rubik's Cube. In these materials, data is stored in different sections, or "blocks".

For years, scientists believed the boundaries separating these blocks were flat, two-dimensional interfaces, like sheets of paper. However, researchers at the Chinese Academy of Sciences' Institute of Physics found that in certain layered crystals, these "sheets" actually shrink into single, one-dimensional lines. These lines are roughly the width of a single atom.

The discovery challenges previous physics theories. Normally, these charged lines would be unstable and vanish quickly due to electrical forces.

The team found that tiny imperfections in the crystal — specifically missing or extra oxygen atoms — act like a form of atomic "glue". These defects hold the charged lines in place, making them stable enough to record and hold information.

Current storage technology, like the solid-state drives in laptops, records data in areas measured in tens of nanometers. These newly discovered "linear" walls are hundreds of times smaller.

"In theory, replacing today's storage units with these atomic-scale features could dramatically increase how much information fits into a tiny space," said Zhong Hai, the study's first author and an associate professor at Ludong University in Shandong province.

The researchers estimate this technology could pack 20 terabytes of data into a single square centimeter. This represents a storage density roughly 600 times greater than current capabilities.

While the researchers were able to create, move, and erase these lines using advanced electron microscopes and local electric fields, the technology is not yet ready for the electronics store.

Zhong emphasized that the work is fundamental research. Significant hurdles remain, such as designing microscopic electrodes capable of controlling these fields in everyday devices.

"This research opens a new path in materials science by redefining how small and flexible information-carrying structures within solids can be," Zhong said.