Abstract: 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.sup.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.