Magnetische Speicherkarte mit hoher Speicherkapazität und Verfahren zu ihrer Herstellung.

摘要

The invention relates to a high density high energy magnetic memory card. The card is provided throughout or part of at least one of its surfaces with a recording medium which contains magnetic particles having a coercitive field higher than 4000 Oe (320 kA/m), which has no overlying layer and which has a density of information higher than 5 kbits/cm<2>, an electric wear corresponding to an electric signal loss equal to or lower than 5 % for 2000 passages, a mean arithmetic rugosity lower than 10 nm, an abrasivity lower than 600 mu m, and a streak resistance lower than 1.5 mu m. Application to portable files and access controls.