公开(公告)号：DE2748351A1

公开(公告)日：1978-06-01

申请号：DE2748351

申请日：1977-10-28

Applicant: IBM

Inventor： CHEATHAM SAMUEL DAVID ,  LEWKOWICZ JULIAN

IPC: G01D5/18 ,  G01H11/02 ,  G11B5/00 ,  G11B5/02 ,  G11B5/39 ,  G11B19/02 ,  G11B23/00 ,  H03G3/20 ,  G11B5/30

公开(公告)号：DE2849693A1

公开(公告)日：1979-06-07

申请号：DE2849693

申请日：1978-11-16

Applicant: IBM

Inventor： CHEATHAM SAMUEL DAVID ,  ROBINSON NEIL LLOYD ,  SMATHERS EDMOND WATKINSON

IPC: G11B5/127 ,  G11B5/23 ,  G11B5/14 ,  G11B5/42

Abstract: An AC magnetic erase head having improved AC erase characteristics, the magnetic head being formed of two half core elements of a magnetic material, preferably ferrite, defining an irregular edged or jagged-edged gap, and including a non-magnetic substance, preferably glass, within the gap. The magnetic head is preferably produced by thermally etching ferrite magnetic material forming the half core elements by means of relatively prolonged heat soak at an elevated temperature.