Magnetoresistance effect element having a pillar electrode

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

11347208

ABSTRACT:
There is provided a magnetoresistance effect element capable of precisely defining the active region in a CPP type MR element and of effectively suppressing and eliminating the influence of a magnetic field due to current from an electrode, and a magnetic head and magnetic reproducing system using the same. The active region of the MR element is defined by the area of a portion through which a sense current flows. Moreover, the shape of the cross section of a pillar electrode or pillar non-magnetic material for defining the active region of the element is designed to extend along the flow of a magnetic flux so as to efficiently read only a signal from a track directly below the active region. When the magnetic field due to current from the pillar electrode can not be ignored, the magnetic flux from a recording medium asymmetrically enters yokes and the magnetization free layer of the MR element to some extent. In expectation of this, if the cross section of the pillar electrode is designed to be asymmetric so as to extend along the flow of the magnetic flux, the regenerative efficiency is improved.

REFERENCES:
patent: 5666248 (1997-09-01), Gill
patent: 5715121 (1998-02-01), Sakakima et al.
patent: 5731937 (1998-03-01), Yuan
patent: 6077618 (2000-06-01), Sakakima et al.
patent: 6198609 (2001-03-01), Barr et al.
patent: 6387285 (2002-05-01), Sasaki
patent: 6452764 (2002-09-01), Abraham et al.
patent: 6456465 (2002-09-01), Louis et al.
patent: 6486662 (2002-11-01), Ruigrok et al.
patent: 6490139 (2002-12-01), Hayashi et al.
patent: 6504689 (2003-01-01), Gill et al.
patent: 6542342 (2003-04-01), Hayashi et al.
patent: 6590750 (2003-07-01), Abraham et al.
patent: 6665152 (2003-12-01), Nemoto
patent: 6671136 (2003-12-01), Arai et al.
patent: 6680827 (2004-01-01), Li et al.
patent: 6700760 (2004-03-01), Mao
patent: 6714374 (2004-03-01), Hayashi et al.
patent: 6795280 (2004-09-01), Song et al.
patent: 2001/0036045 (2001-11-01), Kondo
patent: 2002/0097533 (2002-07-01), Funayama et al.
patent: 2002/0135948 (2002-09-01), Funayama et al.
patent: 2002/0154453 (2002-10-01), Ikeda
patent: 2003/0035251 (2003-02-01), Asida et al.
patent: 1998-024097 (1998-07-01), None
M. N. Baibich, et al., Physical Review Letters, vol. 61, No. 21, pp. 2472-2475, “Giant Magnetoresistance of (001) Fe(001)Cr Magnetic Superlattices,” Nov. 21, 1998.
D.W. Chapman, et al., IEEE Transactions on Magnetics, vol. 25, No. 5, pp. 3689-3691, “A New, Horizontal MR Head Structure”, Sep. 1989.
B. Dieny, et al., Physical Review B, vol. 45, No. 2, pp. 806-813, “Giant Magnetoresistance of Magnetically Soft Sandwiches: Dependence on Tempature and on Layer Thicknesses”, Jan. 1, 1992.
B. Dieny, et al., J. Appl. Phys., vol. 69, No. 8, pp. 4774-4779, “Magnetotransport Properties of Magnetically Soft Spin-Valve Structures (Invited)”, Apr. 15, 1991.
M. A. M. Gijs, et al. Physical Review Letters, vol. 70, No. 21, pp. 3343-3346, “Perpendicular Giant Magnetoresistance of Microstructured Fe/Cr Magnetic Multilayers From 4.2 to 300 K”, May 24, 1993.
M. A. Howson, et al., J. Phys. Condens. Matter, vol. 11, pp. 5717-5722, “Magnetic Multilayers of Fe/Au: Role of the Electron Mean Free Path”, 1999.
S.S.P. Parkin, et al.., Physical Review Letters, vol. 64, No. 19, pp. 2304-2307, “Oscillations in Exchange Coupling and Magnetoresistance in Metallic Superlattice Structures: Co/Ru, Co/Cr, and Fe/Cr”, May 7, 1990.

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

Magnetoresistance effect element having a pillar electrode does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetoresistance effect element having a pillar electrode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetoresistance effect element having a pillar electrode will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3765746

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