Stable ultrahigh-density magneto-optical recordings using introduced linear defects.

摘要: The stability of data bits in magnetic recording media1,2 at ultra-high densities is compromised by the thermal ‘flips’—magnetic spin reversals—of nano-sized domains3, which erase stored information. Media that are magnetized perpendicular to plane film, such as ultrathin cobalt films or multilayered structures4,5, more stable against self-erasure2,6 than conventional memory devices. In this context, magneto-optical memories seem particularly promising for ultrahigh-density on portable disks, and bit ∼100 Gbit inch-2 (ref. 7) have been demonstrated using recent advances writing reading techniques7,8,9,10,11. But roughness mobility domain walls12,13 prevents closer packing bits, therefore presents a challenge reaching even higher densities. Here we report strain imposed linear defect thin film can smooth rough walls over regions hundreds micrometres size, halt their motion. A scaling analysis process, based generic physics disorder-controlled elastic lines14,15,16,17, points simple way media might be prepared store excess 1 Tbit inch-2.