公开(公告)号：US3626396A

公开(公告)日：1971-12-07

申请号：US3626396D

申请日：1968-10-03

Applicant: IBM

Inventor： EASTMAN DEAN E ,  FAN GEORGE J

IPC: G11B5/193 ,  G11B5/31 ,  G11B5/33 ,  G11B5/16 ,  G11B5/20

CPC classification number: G11B5/31 ,  G11B5/193 ,  G11B5/332

Abstract: A magnetic recording head is composed of a substantially Ushaped member made of very thin, highly permeable, ferrite pole pieces. The front gap of the head is of the order of 0.1 mil in width and the magnetic path of the head is closed at the back sides of the pole pieces with a magnetic permalloy film having square loop or nonlinear switching characteristics. The use of the square loop film together with high-permeability pole pieces permits a small magnetic field from a tape or disc to switch a large amount of flux in the permalloy film. Such flux reversal can be sensed with a single turn film of metal.