Exchange-coupled magnetoresistive sensor with a coercive...

Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Reexamination Certificate

active

06992866

ABSTRACT:
An exchange-coupled magnetic structure includes a ferromagnetic layer, a coercive ferrite layer, such as cobalt-ferrite, for biasing the magnetization of the ferromagnetic layer, and an oxide underlayer, such as cobalt-oxide, in proximity to the coercive ferrite layer. The oxide underlayer has a lattice structure of either rock salt or a spinel and exhibits no magnetic moment at room temperature. The underlayer affects the structure of the coercive ferrite layer and therefore its magnetic properties, providing increased coercivity and enhanced thermal stability. As a result, the coercive ferrite layer is thermally stable at much smaller thicknesses than without the underlayer. The exchange-coupled structure is used in spin valve and magnetic tunnel junction magnetoresistive sensors in read heads of magnetic disk drive systems. Because the coercive ferrite layer can be made as thin as 1 nm while remaining thermally stable, the sensor satisfies the narrow gap requirements of high recording density systems.

REFERENCES:
patent: 5465185 (1995-11-01), Heim et al.
patent: 5530609 (1996-06-01), Koga et al.
patent: 5949622 (1999-09-01), Kamiguchi et al.
patent: 6111729 (2000-08-01), Kamiguchi et al.
patent: 6178072 (2001-01-01), Gill
patent: 6208492 (2001-03-01), Pinarbasi
patent: 6313973 (2001-11-01), Fuke et al.
patent: 6338899 (2002-01-01), Fukuzawa et al.
patent: 6348274 (2002-02-01), Kamiguchi et al.
patent: 6398924 (2002-06-01), Pinarbasi
patent: 6411476 (2002-06-01), Lin et al.
patent: 6567246 (2003-05-01), Sakakima et al.
patent: 6580589 (2003-06-01), Gill
patent: 6721144 (2004-04-01), Carey et al.
patent: 6836392 (2004-12-01), Carey et al.
patent: 6870718 (2005-03-01), Takahashi et al.
patent: 2002/0003685 (2002-01-01), Takahashi et al.
patent: 10032119 (1998-02-01), None
Y. Suzuki, R. B. van Dover, E.M. Gyorgy, Julia m. Phillips, V. Korenivski, D. J. Werder, C. H. Chen, R. J. Cave, J. J. Krajewski; “Structure and magnetic properties of expitaxial spinel ferrite thin films;” Appl. Phys. Lett. 68 (5), Jan. 29, 1996.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Exchange-coupled magnetoresistive sensor with a coercive... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exchange-coupled magnetoresistive sensor with a coercive..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exchange-coupled magnetoresistive sensor with a coercive... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3589729

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.