[54] WRITE HEAD WITH HIGH THERMAL STABILITY MATERIAL
[75] Inventor: Hardayal Singh Gill, Portola Valley, Calif.
[73] Assignee: International Business Machines Corporation, Armonk, N.Y.
[21] Appl. No.: 09/127,386 [22] Filed: Jul. 31, 1998
[51] Int. CI.7 G11B 5/31; G11B 5/39
[52] U.S. CI 360/126; 360/113
[58] Field of Search 360/113, 126,
360/125
[56] References Cited
U.S. PATENT DOCUMENTS
5,462,809 10/1995 Berkowitz 428/546
5,529,814 6/1996 Tan et al 427/547
5,563,331 10/1996 Von Helmolt et al 360/113
5,587,026 12/1996 Iwasaki et al 148/313
5,589,221 12/1996 Hiramoto et al 427/130
5,591,532 1/1997 Berkowitz 428/611
5,719,730 2/1998 Chang et al 360/113
FOREIGN PATENT DOCUMENTS
0 791 915 A2 8/1997 European Pat. Off. .
A combined magnetic head (40) for a rotating magnetic media disk drive (30) wherein a write head portion (50) is structurally integral with a read head portion (52). During manufacture the read head portion (52) is exposed to high temperature in a magnetic field perpendicular to an air bearing surface (46) of the combined magnetic head (40). In order to prevent unwanted realignment of the PI pole (78) and P2 pole (80) of the write head portion (50) the PI pole (78) and (P2) pole are constructed from a class of materials known as nanocrystalline ferromagnetic oxides, which can withstand temperatures well in excess of the incident manufacturing conditions without succumbing to the unwanted effects.
34 Claims, 5 Drawing Sheets
