The bubbles are magnetic garnet crystals grown on nonmagnetic substrate, ranging in size from 2 to 30 micrometers, and used as nonvolatile data storage.

• 泡沫是有磁性的深红色晶体，产生于无磁性的基地层，并会扩大到2到30微米，并产生非易失性的数据保存。