The team used a method known as X-ray diffraction, along with a computer simulation, to document what was happening to the material at the atomic level. By recording the changes in "slow motion," the researchers found that they could actually tune the electrical resistivity of the material during the time between its change from amorphous to crystalline form.
"Instead of going from black to white, it's like finding shades or a shade of gray in between," said En Ma, a professor of materials science and engineering, and a co-author of the PNAS paper. "By having a wide range of resistance, you can have a lot more control. If you have multiple states, you can store a lot more data."
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