G PHYSICS
G11 INFORMATION STORAGE
G11B INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B5/00 Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
G11B5/127 Structure or manufacture of heads, e.g. inductive
G11B5/1278 specially adapted for magnetisations perpendicular to the surface of the record carrier