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Magnetic tunnel junction magnetoresistive read head with sensing layer as rear flux guide
| Details |
Inventors: Fontana, Jr., Robert Edward; Parkin, Stuart Stephen Papworth; Tsang, Ching Hwa; Williams, Mason Lamar;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Wolff; John H.
Assistant Examiner:
Attorney, Agent or Firm: Berthold; Thomas R.
A magnetic tunnel junction (MTJ) magnetoresistive read head for a magnetic recording system has the MTJ sensing or free ferromagnetic layer also functioning as a flux guide to direct magnetic flux from the magnetic recording medium to the tunnel junction. The MTJ fixed ferromagnetic layer and the MTJ tunnel barrier layer have their front edges substantially coplanar with the sensing surface of the head. Both the fixed and free ferromagnetic layers are in contact with opposite surfaces of the MTJ tunnel barrier layer but the free ferromagnetic layer extends beyond the back edge of either the tunnel barrier layer or the fixed ferromagnetic layer, whichever back edge is closer to the sensing surface. This assures that the magnetic flux is non-zero in the tunnel junction region. The magnetization direction of the fixed ferromagnetic layer is fixed in a direction generally perpendicular to the sensing surface and thus to the magnetic recording medium, preferably by interfacial exchange coupling with an antiferromagnetic layer. The magnetization direction of the free ferromagnetic layer is aligned in a direction generally parallel to the surface of the medium in the absence of an applied magnetic field and is free to rotate in the presence of applied magnetic fields from the medium. A layer of high coercivity hard magnetic material adjacent the sides of the free ferromagnetic layer longitudinally biases the magnetization of the free ferromagnetic layer in the preferred direction. |
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DETAILED DESCRIPTION OF THE INVENTION Prior Art Referring first to FIG.
1, there is illustrated in sectional view a schematic of a prior art disk drive of the type using a MR sensor.
The disk drive comprises a base 10 to which are secured a disk drive motor 12 and an actuator 14, and a cover 11.
The base 10 and cover 11 provide a substantially sealed housing for the disk drive.
Typically, there is a gasket 13 located between base 10 and cover 11 and a small breather port (not shown) for equalizing pressure between the interior of the disk drive and the outside environment.
A magnetic recording disk 16 is connected to drive motor 12 by means of hub 18 to which it is attached for rotation by the drive motor 12.
A thin lubricant film 50 is maintained on the surface of disk 16.
A read/write head or transducer 25 is formed on the trailing end of a carrier, such as an air-bearing slider 20.
Transducer 25 is a read/write head comprising an inductive write head portion and a MR read head portion, as will be described with respect to FIG.
3.
The slider 20 is connected to the actuator 14 by means of a rigid arm 22 and a suspension 24.
The suspension 24 provides a biasing force which urges the slider 20 onto the surface of the recording disk 16.
During operation of the disk drive, the drive motor 12 rotates the disk 16 at a constant speed, and the actuator 14, which is typically a linear or rotary voice coil motor (VCM), moves the slider 20 generally radially across the surface of the disk 16 so that the read/write head 25 may access different data tracks on disk 16.
FIG.
2 is a top view of the interior of the disk drive with the cover 11 removed, and illustrates in better detail the suspension 24 which provides a force to the slider 20 to urge it toward the disk 16.
The suspension may be a conventional type of suspension, such as the well-known Watrous suspension, as described in IBM's U.
S.
Pat.
No.
4,167,765.
This type of suspension also provides a gimbaled attachment of the slider which allows the slider to pitch and roll as it rides on the air bearing
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Metal Working 
