Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2005-03-29
2005-03-29
Miller, Brian E. (Department: 2652)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
06873499
ABSTRACT:
A read head has a flux guide layer that is immediately adjacent (abuts) the back edge of a read sensor. The flux guide layer is made of a high resistance soft magnetic material that conducts magnetic flux from the back edge of the read sensor so that the magnetic response at the back edge of the read sensor is significantly higher than zero. This increases the efficiency of the read sensor. The material for the flux guide layer is A-B-C where A is selected from the group Fe and Co, B is selected from the group Hf, Y, Ta and Zr and C is selected from the group O and N. In a preferred embodiment A-B-C is Fe—Hf—O and the Msρ of the flux guide layer is greater than 50 times the Msρ of the read sensor layer where the read sensor layer is NiFe, Msis saturation magnetization and ρ is resistivity. Because of the flux guides high resistance current shunting losses are nearly eliminated.
REFERENCES:
patent: 4489357 (1984-12-01), Van Ooijen et al.
patent: 5018037 (1991-05-01), Krounbi et al.
patent: 5241439 (1993-08-01), Michalek et al.
patent: 5390061 (1995-02-01), Nakatani et al.
patent: 5469317 (1995-11-01), Nagata et al.
patent: 5473492 (1995-12-01), Terunuma et al.
patent: 5508868 (1996-04-01), Cheng et al.
patent: 5523687 (1996-06-01), Mouchot et al.
patent: 5527626 (1996-06-01), Gijs et al.
patent: 5541793 (1996-07-01), Schwarz
patent: 5583726 (1996-12-01), Mizoshita et al.
patent: 5617275 (1997-04-01), Ogura et al.
patent: 5627704 (1997-05-01), Lederman et al.
patent: 5636093 (1997-06-01), Gijs et al.
patent: 5702832 (1997-12-01), Iwasaki et al.
patent: 5731937 (1998-03-01), Yuan
patent: 5894385 (1999-04-01), Gill et al.
patent: 5905610 (1999-05-01), Mitchell et al.
patent: 5909344 (1999-06-01), Gill
patent: 5930084 (1999-07-01), Dovek et al.
patent: 5995339 (1999-11-01), Koshikawa et al.
patent: 6028749 (2000-02-01), Postma
patent: 6101072 (2000-08-01), Hayashi
patent: 6103545 (2000-08-01), Fedeli
patent: 6137661 (2000-10-01), Shi et al.
patent: 6205007 (2001-03-01), Ruigrok et al.
patent: 6223420 (2001-05-01), Lee et al.
patent: 6233126 (2001-05-01), Van der Zaag et al.
patent: 6266217 (2001-07-01), Ruigrok et al.
patent: 6369992 (2002-04-01), Yoda et al.
patent: 6396670 (2002-05-01), Murdock
patent: 0 654 782 (1994-11-01), None
patent: 404144210 (1992-05-01), None
patent: 408087715 (1994-09-01), None
patent: 408277445 (1995-04-01), None
patent: 8-339514 (1995-06-01), None
patent: 408138212 (1996-05-01), None
patent: 408161711 (1996-06-01), None
patent: 408287425 (1996-11-01), None
patent: 408339508 (1996-12-01), None
patent: 408339514 (1996-12-01), None
patent: 409212820 (1997-08-01), None
“Microstructure and Magnetoresistance of Fe-Hf-O Films with High Electrical Resistivity”, Journal of Magnetism and Magnetic Materials, 154, 1996, 175-182.
“Fe-Hf-N Soft Magnetic Film for Magnetoresistive Head Biasing”,IBM Technical Disclosure Bulletin, vol. 39, No. 10, Oct. 1996, pp. 19-20.
Lee Wen Yaung
Lin Tsann
Mauri Daniele
Seagle David John
Johnston Ervin F.
Miller Brian E.
LandOfFree
Read head having high resistance soft magnetic flux guide... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Read head having high resistance soft magnetic flux guide..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Read head having high resistance soft magnetic flux guide... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3419184