Guide Perpendicular magnetic recording

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This is in contrast to the longitudinal reader configuration, for which the flux is returned through the ABS regions of the shields, which is many times larger than the area of the read element. Consequently, provided that the returning sensitivity field has a dominantly perpendicular component, a conventional reader is more sensitive to side reading when it is used with a perpendicular medium. The read head is similar in many aspects to the read head 30 , as was described in detail herein. The read head includes a read element and means for magnetically shielding the read element to reduce or improve side reading and to improve resolution of the read head Specifically, the means for magnetically shielding the read element includes a magnetic shield, generally designated by reference number The magnetic shield includes individual magnetic shield members and which are connected to collectively form the magnetic shield The magnetic shield , in this embodiment, at least partially surrounds the read element at an ABS of the read element to magnetically shield during a read operation.

By providing the magnetic shield with individual magnetic shield members and , at least a portion of the magnetic shield magnetically shields the read element in the across-the-track direction and at least a portion of the magnetic shield magnetically shields the read element in an along-the-track direction of the read element as well. Due to the symmetric nature of perpendicular magnetic recording, as discussed, the read head will result in the reduction of side reading and improvement of resolution of the read head The magnetic shield is constructed to have a thickness TH.

In addition, the magnetic shield is spaced apart from the read element a distance of D. The thickness TH and distance D may be the same as for the read head 30 , as described herein. In comparison with the graph in FIG. The fact that the negative polarity tail is smaller in magnitude than the positive polarity tail is explained by the fact that the net ABS area of the shields is larger than the ABS area of the reader. Whereas particular embodiments have been described herein for the purpose of illustrating the invention and not for the purpose of limiting the same, it will be appreciated by those of ordinary skill in the art that numerous variations of the details, materials, and arrangement of parts may be made within the principle and scope of the invention without departing from the invention as described in the appended claims.

Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : A read head for perpendicular magnetic recording that reduces side reading. The read head includes a read element and a magnetic shield spaced apart from the read element. What is claimed is: 1. A read head for perpendicular magnetic recording, comprising:.

The read head of claim 1 , wherein said read element is a magnetoresistance type read element. The read head of claim 1 , wherein said read element is a giant magnetoresistance type read element. The read head of claim 1 , wherein said means for magnetically shielding said read element includes said magnetic shield, at least a portion of said magnetic shield magnetically shielding said read element in an across the track direction of said read element and at least a portion of said magnetic shield magnetically shielding said read element in an along the track direction of said read element.

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The read head of claim 1 , wherein said magnetic shield at least partially surrounds said read element at an air-bearing surface of said read element. The read head of claim 1 , wherein the ratio of an air-bearing surface area of said magnetic shield to an air-bearing surface area of said read element is from about to about The read head of claim 1 , wherein said magnetic shield is spaced apart from said read element a distance of from about 10 nm to about 50 nm. The read head of claim 9 , wherein said magnetic shield at least partially surrounds said read element at an air-bearing surface of said read element.

The read head of claim 9 , wherein at least a portion of said magnetic shield magnetically shields said read element in an across the track direction of said read element. The read head of claim 9 , wherein at least a portion of said magnetic shield magnetically shields said read element in an along the track direction of said read element.

The read head of claim 9 , wherein said magnetic shield has an air-bearing surface area in the range of about 10, nm 2 to about 40, nm 2. The read head of claim 9 , wherein said magnetic shield is spaced apart from said read element a distance of from about 10 nm to about 50 nm. A magnetic disc drive storage system, comprising:. The magnetic disc drive storage system of claim 15 , wherein said magnetic shield at least partially surrounds said read element at an air-bearing surface of said read element.

The read head of claim 15 , wherein said means for magnetically shielding said read element includes a magnetic shield, at least a portion of said magnetic shield magnetically shielding said read element in an across the track direction of said read element and at least a portion of said magnetic shield magnetically shielding said read element in an along the track direction of said read element.

The read head of claim 15 , wherein said magnetic shield is spaced apart from said read element a distance from about 10 nm to about 50 nm. The read head of claim 15 , wherein said magnetic shield surrounds said read element at an air-bearing surface of said read element. USP true Perpendicular magnetic recording head with a magnetic shield to reduce side reading.

USB2 en. Magnetic recording head with a side shield structure for controlling side reading of thin film read sensor. Perpendicular magnetic write head having a magnetic write pole with a concave trailing edge.


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Perpendicular write head having a modified wrap-around shield to improve overwrite, adjacent track interference and magnetic core width dependence on skew angle. Magnetoresistive magnetic head having a non-magnetic part on a medium facing surface side of the sensor. Magnetic write head manufactured by damascene process producing a tapered write pole with a non-magnetic step and non-magnetic bump. Method for manufacturing a magnetic write head having a wrap around shield that is magnetically coupled with a leading magnetic shield.

Magnetically soft, high saturation magnetization laminates of iron-cobalt-nitrogen and iron-nickel. As described in this paper, the invention and development of a new method of placing the magnetized information perpendicular to the plane of the magnetic recording medium is presented.

The yield in the mass production of high-density hard disk drives HDDs for perpendicular recording is much higher than that of HDDs for conventional recording.

perpendicular recording

Read Article at publisher's site. How does Europe PMC derive its citations network? Protein Interactions. Protein Families. Nucleotide Sequences.

Head Instability Detection for Testing Process in Perpendicular Magnetic Recording System

Consequently, the better the resolution of the reader, the larger the data density than can be read back from a recording medium. It has been determined that another fundamental disadvantage of implementing a conventional longitudinal reader in perpendicular magnetic recording is the fundamental difference of waveforms generated in the perpendicular and longitudinal recording modes.

For example, FIG. The calculations were based on the reciprocity principle using a commercial three-dimensional boundary element field solver to calculate the sensitivity functions. From FIG. In other words, the longitudinal signal 19 comes only from the transition while the perpendicular signal 21 spreads significantly from the transition.

perpendicular recording Definition from PC Magazine Encyclopedia

More specifically, FIG. It can be seen that the sensitivity function of the longitudinal reader has a bi-polar shape for the longitudinal component 23 and a mono-polar shape for the perpendicular component There is identified, therefore, a need for a read head for a perpendicular magnetic recording system which overcomes disadvantages, limitations, or shortcomings of known read heads, and in particular conventional longitudinal readers, that may be used in a perpendicular magnetic recording system.

Embodiments of the invention meet the identified need, as well as other needs, as will be more fully understood following a review of this specification and drawings. In accordance with an aspect of the invention, a read head for perpendicular magnetic recording includes a read element and means for magnetically shielding the read element to reduce side reading. The means for magnetically shielding the read element may include a magnetic shield spaced apart from the read element and at least partially surrounding the read element at an air-bearing surface of the read element.

The ratio of an air-bearing surface area of the magnetic shield to an air-bearing surface area of the read element is from about to about In addition, the magnetic shield may be spaced apart from the read element a distance from about 10 nm to about 50 nm.


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In accordance with an additional aspect of the invention, a read head for perpendicular magnetic recording comprises a read element and a magnetic shield spaced apart from the read element. The ratio of an air-bearing surface area of the magnetic shield to an air-bearing area of the read element is from about to about The magnetic shield at least partially surrounds the read element at an air-bearing surface of the read element.

In accordance with yet another aspect of the invention, a magnetic disc drive storage system includes a housing, a perpendicular magnetic storage medium positioned in the housing and a read head for perpendicular magnetic recording positioned adjacent the perpendicular magnetic storage medium. The read head of the magnetic disc drive storage system is constructed in accordance with the invention as described herein.

The invention provides a perpendicular magnetic recording head, and more particularly a perpendicular magnetic recording read head for reducing side reading during a read operation.

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The invention also provides for improved resolution of the read head. The invention is particularly suitable for use with a magnetic disc drive storage system. The disc drive 10 includes a housing 12 with the upper portion removed and the lower portion visible in this view sized and configured to contain the various components of the disc drive. The disc drive 10 includes a spindle motor 14 for rotating at least one magnetic storage medium 16 , which may be a perpendicular magnetic recording medium, within the housing, in this case a magnetic disc. At least one arm 18 is contained within the housing 12 , with each arm 18 having a first end 20 with a recording head or slider 22 , and a second end 24 pivotally mounted on a shaft by a bearing An actuator motor 28 is located at the arm's second end 24 for pivoting the arm 18 to position the recording head 22 over a desired sector or track 27 of the disc The actuator motor 28 is regulated by a controller, which is not shown in this view and is well known in the art.

The read element 32 may be, for example, a magnetoresistance MR type read element, a giant magnetoresistance GMR type read element, or the like. Perpendicular magnetic recording is generally symmetric in many aspects with respect to an along-the-track direction see arrow 29 in FIG.

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This is in contrast to longitudinal magnetic recording where the magnetization is directed generally parallel to the plane of the disc, such as disc Accordingly, for perpendicular magnetic recording it is desirable to shield the read element 32 in both the along-the-track and the across-the-track direction. Thus, the means for magnetically shielding the read element in accordance with the invention includes means, such as a magnetic shield, wherein at least a portion of the magnetic shield shields the read element 32 in the across-the-track direction and at least a portion of the magnetic shield also magnetically shields the read element 32 in the along-the-track direction to minimize or reduce side reading during a read operation.

Still referring to FIG. The magnetic shield 34 is spaced apart from the read element 32 to at least partially surround the read element 32 at the ABS of the read element Specifically, the magnetic shield 34 , in this embodiment, includes magnetic shield members 36 , 38 , 40 and 42 which are connected to collectively form the magnetic shield 34 and to surround the read element 32 , particularly at the ABS of the read element This particular configuration provides optimal magnetic shielding in both the along-the-track and the across-the-track directions while performing the read operation.

In accordance with the invention, the magnetic shield 34 is constructed such that a thickness TH thereof is relatively narrow in comparison to a thickness of magnetic shields used in a conventional longitudinal read head. The thickness TH, which may be the same or may be different for each of the individual magnetic shield members 36 , 38 , 40 and 42 , is selected such that the ratio of an ABS area of the magnetic shield 34 to an ABS area of the read element 32 may be in the range from about to about However, it will be appreciated that the ABS of the magnetic shield 34 and the ABS of the read element 32 may be of other shapes and configurations.

The ABS area of the magnetic shield 34 may be in the range of about 10, nm 2 to about 40, nm 2. The bi-polar localized shape of the sensitivity field is equivalent to the fact that the reader is going to be sensitive only to a varying in space magnetization pattern. In other words, it is going to be insensitive to a uniform DC magnetization pattern in a recording medium.

This provides that the waveforms provided by the invented reader configuration, if used along with a perpendicular medium, is very similar to the waveforms provided by a conventional longitudinal reader when used along with a longitudinal medium. Another aspect of the invention is the distance D which separates the read element 32 from the individual magnetic shield members 36 , 38 , 40 and 42 of the magnetic shield The distance D may be from about 10 nm to about 50 nm.

In addition, it will be appreciated that the distance D may be the same on all sides of the read element 32 or the distance D may be varied for one or more sides while still within the stated range. By maintaining the distance D within the stated range, the resolution of the read head 30 is improved. The smaller the distance D, the better the resolution.

However, D can not be too small because if it is too small the maximum magnitude of the sensitivity field is not going to be sufficiently large.