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Patent Issued for Magnetic Recording Sensor with Sputtered Antiferromagnetic Coupling Trilayer between Plated Ferromagnetic Shields

July 8, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Liu, Feng (San Ramon, CA); Han, Dehua (Fremont, CA); Sun, Ming (Pleasanton, CA); Guo, Yimin (San Jose, CA), filed on December 23, 2010, was published online on June 24, 2014.

The assignee for this patent, patent number 8760819, is Western Digital (Fremont), LLC (Fremont, CA).

Reporters obtained the following quote from the background information supplied by the inventors: "FIG. 1 illustrates a conventional disk drive 10 used for data storage. FIGS. 1, 1a, and 1b are not drawn to scale and only certain structures are depicted for clarity. Disk media 50 is attached to spindle motor and hub 20. The spindle motor and hub 20 rotate the media 50 in a direction shown by arrow 55. Head Stack assembly (HSA) 60 includes a magnetic recording head 30 on actuator arm 70 and positions actuator arm 70 by positioning the voice coil motor (VCM) 25 over a desired data track, shown as recording track 40 in this example, to write data onto the media 50.

"FIG. 1a illustrates an enlarged view of area 30 of FIG. 1. A magnetic sensor 90 is fabricated on slider 80. Slider 80 may be attached to suspension 75 and suspension 75 may be attached to actuator arm 70 as shown in FIG. 1b. Slider 80 may also incorporate a write transducer 92.

"Referring again to FIG. 1a, slider 80 is illustrated above recording track 40. Media 50 and track 40 are moving under slider 80 in an in-track direction shown by arrow 42. The cross-track direction is shown by arrow 41.

"FIG. 1b illustrates a side view of the disk drive 10 shown in FIG. 1. At least one disk media 50 is mounted onto spindle motor and hub 20. HSA 60 comprises at least one actuator arm 70 that carries suspension 75 and slider 80. Slider 80 has an air bearing surface (ABS) facing media 50. When the media is rotating and actuator arm 70 is positioned over the media 50, slider 80 floats above media 50 by aerodynamic pressure created between the slider ABS and the surface of media 50 facing the ABS of slider 80."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "A magnetic recording sensor for use in a data storage device is described. The magnetic recording sensor has a magnetoresistive sensing element and magnetic shields shielding the magnetoresistive sensing element. The magnetic shields include a first plated soft ferromagnetic layer, a second plated soft ferromagnetic layer, and an antiferromagnetic coupling (AFC) trilayer between the first plated soft ferromagnetic layer and the second plated soft ferromagnetic layer. The AFC trilayer includes a first AFC layer of sputtered ferromagnetic material; a second AFC layer of a nonmagnetic antiferromagnetic exchange material, and a third AFC layer of sputtered ferromagnetic material. Shields with AFC trilayers in bottom, side, and/or top shields, and well as between shields are provided. A method of fabricating is also provided.

"The magnetic recording sensor for use in a data storage device has a read sensor stack having a read sensor and a first end opposing a second end. The magnetic shield may include a first soft ferromagnetic layer, a second soft ferromagnetic layer, and an antiferromagnetic coupling (AFC) trilayer between the first soft ferromagnetic layer and the second soft ferromagnetic layer. The AFC trilayer may include a first AFC layer comprising ferromagnetic material, a second AFC layer comprising a nonmagnetic antiferromagnetic exchange material, and a third AFC layer comprising ferromagnetic material. The second soft ferromagnetic layer may surround a portion of the first and second ends of the read sensor stack. The AFC trilayer may surround a portion of the first and second ends of the read sensor stack. The read sensor stack may be separated from the first and second soft ferromagnetic layers by a nonmagnetic gap. The AFC trilayer may surround the read sensor of the read sensor stack along the first and second ends of the read sensor stack.

"The read sensor stack may also include a third end opposing a fourth end. The magnetic recording sensor may further include a second AFC trilayer and a bottom shield disposed on the side of the fourth end of the read sensor stack. The magnetic shield may include a third soft ferromagnetic layer. The second AFC trilayer location may be at least one of: between the first and third soft ferromagnetic layers of the magnetic shield or within the bottom shield.

"A disk drive is described. The disk drive has a slider including a magnetic sensor. The magnetic sensor includes a read sensor stack. The read sensor stack may include a read sensor and a first end opposing a second end. The magnetic sensor may include at least one magnetic shield. The at least one magnetic shield may include a first soft ferromagnetic layer, a AFC trilayer, and a second soft ferromagnetic layer. The second soft ferromagnetic layer may surround a portion of the first and second ends of the read sensor stack. The AFC trilayer may surround a portion of the first and second ends of the read sensor stack. The read sensor stack may be separated from the first and second soft ferromagnetic layers by a nonmagnetic gap. The AFC trilayer may surround the read sensor of the read sensor stack along the first and second ends of the read sensor stack."

For more information, see this patent: Liu, Feng; Han, Dehua; Sun, Ming; Guo, Yimin. Magnetic Recording Sensor with Sputtered Antiferromagnetic Coupling Trilayer between Plated Ferromagnetic Shields. U.S. Patent Number 8760819, filed December 23, 2010, and published online on June 24, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8760819.PN.&OS=PN/8760819RS=PN/8760819

Keywords for this news article include: Western Digital, Information Technology, Information and Data Storage.

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Source: Information Technology Newsweekly


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