Researchers, led by Chunhui Rita Du from the University of California, San Diego, have made significant strides in understanding an engineered quantum state of matter known as moiré magnetism, which emerges when two-dimensional crystals are stacked with a slight twist. This area of study is at the cutting edge of condensed matter physics. By using quantum sensing, Du’s team has observed magnetic domains and spin behaviors in twisted double trilayer chromium triiodide (tDT CrI3). They found that in low-twist-angle structures, distinct moiré patterns of opposite magnetizations appear, while spin fluctuations show little variation due to strong interactions within the layers.