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Patent Issued for Slanted Bump Design for Magnetic Shields in Perpendicular Write Heads and Method of Making Same

May 27, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- HGST Netherlands B.V. (Amsterdam, NL) has been issued patent number 8724258, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Zhang, Sue S. (Saratoga, CA); Zheng, Yi (San Ramon, CA).

This patent was filed on September 30, 2009 and was published online on May 13, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "Embodiments of the present invention generally relate to write heads for hard disk drives and in particular to a slanted bump design for magnetic shields of write heads used for perpendicular recording on a magnetic disk.

"There has been increasing progress in the field of magnetic disk storage system technology in recent years. Such success has made storage systems an important component of modern computers. Some of the most important customer attributes of any storage system are the cost per megabyte, data rate, and access time. In order to obtain the relatively low cost of magnetic disk storage systems compared to solid state memory, the customer must accept the less desirable features of this technology, which include a relatively slow response, high power consumption, noise, and the poorer reliability attributes associated with any mechanical system. On the other hand, magnetic storage systems have always been nonvolatile; i.e., no power is required to preserve the data, an attribute which in semiconductor devices often requires compromises in processing complexity, power-supply requirements, writing data rate, or cost. Improvements in areal density (the amount of information that can be placed within a given area on a disk drive), have been the chief driving force behind the historic improvement in storage cost. In fact, the areal density of magnetic disk storage systems continues to increase. As the magnetic particles that make up recorded data on a magnetic disk become ever smaller, technical difficulties in writing and reading such small bits occur.

"Perpendicular recording is one alternative to increase areal densities when compared with longitudinal recording. In recent years, the increased demand for higher data rate and areal density has driven the perpendicular head design to scale toward smaller dimensions and the need for constant exploration of new head designs, materials, and practical fabrication methods. Some of the problems encountered with perpendicular recording are side writing and side erasure, to adjacent tracks on the disk. These problems occur from leakage and fringing of the magnetic flux from the magnetic write head. To minimize these effects, one approach is to provide either a trailing or wrap-around shield on the magnetic write head. These shields allow effective magnetic flux to be provided for writing to the disk, while avoiding leakage and fringing that can lead to the above-described problems. As the areal density of the disks increases, however, the ability of existing shields to achieve the desired results decreases."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "The present invention, in a first embodiment, is a magnetic write head for a hard disk drive. The magnetic write head includes: an air bearing surface (ABS); a magnetic write pole having an end that defines part of the ABS; a layer of non-magnetic gap material on the magnetic write pole, the layer of non-magnetic gap material including a taper defined by an increasing thickness of the layer of non-magnetic gap material from a first thickness at a first distance from the ABS, to greater thicknesses in a direction away from the ABS; and a magnetic shield on the layer of non-magnetic gap material.

"In a further embodiment, the invention is a hard disk drive having a magnetic storage disk and a magnetic write head for writing data to the disc drive. The magnetic write head includes an air bearing surface (ABS), adjacent to and facing the magnetic disk, a magnetic write pole having an end substantially on the ABS, a layer of non-magnetic gap material on the magnetic write pole, the layer of non-magnetic gap material including a taper defined by an increasing thickness of the layer of non-magnetic gap material from a first thickness at a first distance from the ABS, to greater thicknesses in a direction away from the ABS; and a magnetic shield on the layer of non-magnetic gap material.

"In another embodiment the invention is a method of forming a magnetic write head. The method includes providing a substrate, wherein the substrate has a first layer of magnetic material for forming a magnetic pole of the write head, and a second layer of non-magnetic material on the first layer. A third layer of non-magnetic gap material is then deposited on the second layer, followed by depositing a layer of photoresist on the third layer. A first etch process is conducted on the third layer using the layer of photoresist as a mask. A second etch process is conducted on the third layer and the first and second etch processes form a taper in the third layer, such that the layer of non-magnetic gap material increases in thickness at a first distance from the ABS, in a direction away from the ABS. A fourth layer of magnetic material is deposited on the third layer to form a magnetic shield of the write head."

For the URL and additional information on this patent, see: Zhang, Sue S.; Zheng, Yi. Slanted Bump Design for Magnetic Shields in Perpendicular Write Heads and Method of Making Same. U.S. Patent Number 8724258, filed September 30, 2009, and published online on May 13, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=54&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2687&f=G&l=50&co1=AND&d=PTXT&s1=20140513.PD.&OS=ISD/20140513&RS=ISD/20140513

Keywords for this news article include: Technology, Electronics, Magnetic Flux, HGST Netherlands B.V..

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Source: Journal of Technology


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