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… "So it turns out the system has memory," Comin says. "The material retains a memory of where the magnetic bits would be. This was also very unexpected. We thought we would see a completely new domain distribution, but we observed the same pattern re-emerging, even after seemingly erasing these magnetic bits altogether."
After mapping the material's magnetic domains, and measuring the size of each domain, the researchers counted the number of domains of a given size, and plotted their number as a function of size. The resulting distribution resembled a downward slope—a pattern that they found, again and again, no matter what range of domain size they focused in on. "We have observed textures of unique richness spanning multiple spatial scales," Li says. "Most strikingly, we have found that these magnetic patterns have a fractal nature." Comin says that understanding how a material's magnetic domains arrange at the nanoscale, and knowing that they exhibit memory, is useful, for instance in designing artificial neurons, and resilient, magnetic data storage devices. Related research: https://physicstoday.scitation.org/do/10.1063/PT.6.1.20191015a/full
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