procedures for the magnetic characterization of the registrierungsschicht a magnetic informationstraegers.

摘要

A method and an apparatus are disclosed for determining or defining a magnetic information carrier (TAMB) which includes a plurality of tracks P each having a synchronization index (IND). In the method, (1) the synchronization index (IND) is located, which makes it possible to initialize (pulse IN) the sequence (SEQ1, SEQ2, . . . ) of the following successive operations, which are repeatable p times; (2) the entire surface of the track is first erased; (3) next, on this same surface, a succession of magnetic domains (Ai, Ai+1, Ai+2, . . . ) is written; (4) at predetermined sampling times (tn, tn+1. . . ), with a predetermined sampling period TE, a signal S is read, which is a function of the magnetization inside each of the domains read at these times; and (5) the values of the current I and signal S are memorized.