Limits on data storage based on thermal error

Thermally induced error: Density limit for magnetic data storage.
R. F. L. Evans, R. W. Chantrell, U. Nowak, A. Lyberatos, and H.-J. Richter
Appl. Phys. Lett. 100, 102402 (2012)

Schematic of the “quadrilemma” of magnetic recording. The decrease of grain volume requires an increase in the anisotropy constant K for thermal stability and also maximisation of the saturation magnetisation Ms to ensure thermal writability.