公开(公告)号：US06651313B1

公开(公告)日：2003-11-25

申请号：US09684227

申请日：2000-10-06

Applicant: Thomas Young Chang ,  Michael Andrew Parker

Inventor： Thomas Young Chang ,  Michael Andrew Parker

IPC: G11B5127

CPC classification number: G11B5/3116 ,  G11B5/3163 ,  Y10T29/49032 ,  Y10T29/49041 ,  Y10T29/49043 ,  Y10T29/49046 ,  Y10T29/49048

Abstract: In the present method for manufacturing a magnetic write head a focused ion beam (FIB) tool is utilized to mill the side edges of a P2 pole, in order to provide a narrowed track width. Prior to milling, a thin film layer of material is deposited upon the P2 pole tip. The milling boxes of the FIB tool are properly aligned upon the layer with reference to the location of the P2 pole tip. Milling of the lateral edges of the P2 pole tip is then conducted to the appropriate depth, and the layer of material is removed. The resulting P2 pole tip has sharp lateral edges, rather than the rounded edges that are produced in prior art FIB processing methods that do not utilize the thin film layer. In a preferred implementation, the FIB tool is utilized first to deposit the thin film layer and thereafter to perform the milling operation.

Abstract translation: 在本发明的磁写头的制造方法中，为了提供窄的轨道宽度，使用聚焦离子束（FIB）工具来研磨P2极的侧边缘。 在铣削之前，将薄膜层材料沉积在P2极尖端上。 参考P2极尖的位置，FIB工具的铣床在层上正确对准。 然后将P2极端部的侧边缘的铣削进行到适当的深度，并且去除材料层。 所得到的P2极端头具有尖锐的侧边缘，而不是在不利用薄膜层的现有技术FIB处理方法中产生的圆形边缘。 在优选的实施方式中，首先利用FIB工具沉积薄膜层，然后进行铣削操作。

公开(公告)号：US06473276B1

公开(公告)日：2002-10-29

申请号：US09721850

申请日：2000-11-24

Applicant: Thomas Young Chang ,  Edward Hinpong Lee ,  Jyh-Shuey Jerry Lo

Inventor： Thomas Young Chang ,  Edward Hinpong Lee ,  Jyh-Shuey Jerry Lo

IPC: G11B539

CPC classification number: G11B5/3967 ,  G11B5/024 ,  G11B5/23 ,  G11B5/232 ,  G11B5/3116 ,  G11B5/3163 ,  Y10T29/49044 ,  Y10T29/49046

Abstract: A single-sided, notched write head is provided for writing narrow erase band servo tracks as well as a double-notched write head, and for writing data tracks better than a double-notched write head. The single-sided, notched write head writes a narrow erase band on the notched side and a wide erase band on the unnotched side. In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment a first side of the first pole piece layer is notched more than a second side. By writing servo tracks only a fraction of the track width of the write head, a wide erase band region is overwritten so that a narrow erase band is on each side of the servo track. Data tracks are written with a narrow erase band on one side and a wide erase band on the other side. The wide erase band on one side of the data track allows more flexibility in spacing the read head from adjacent tracks. The single-sided, notched write head can be manufactured with methods that require less processing time than a double-notched write head. In one method, a notching layer is employed where removal of a small corner of the notching layer provides the first pole piece with a notch. Other methods employ photoresist to protect the side of the first pole piece that is not to be notched, and/or oscillating the workpiece less than 360°. so that milling is more concentrated at the notch site.

Abstract translation: 提供单面，带缺口的写入头，用于写入窄擦除带伺服磁道以及双切口写入头，并且用于比双切口写入头更好地写入数据轨道。 单面缺口写头在缺口侧写入窄擦除带，并在无缺口侧写入宽擦除带。 在一个实施例中，仅第一极靴层的一侧被切口，而在另一实施例中，第一极靴层的第一侧比第二侧更多地被切口。 通过仅将写入磁道的磁道宽度的一部分写入伺服磁道，将覆盖宽的擦除带区域，使得在伺服磁道的每一侧上存在窄的擦除带。 数据磁道在一侧写入窄的擦除频带，另一侧写入宽的擦除频带。 在数据轨道的一侧上的宽擦除带允许在读取头与相邻轨道间隔距离方面更加灵活。 单面，缺口写头可以使用比双切口写头要少的处理时间的方法制造。 在一种方法中，采用切口层，其中切口凹陷层的小角的移除为第一极片提供凹口。 其他方法使用光致抗蚀剂来保护第一极靴的不被切口的一侧，和/或使工件摆动小于360°。 使得铣削更集中在切口部位。

公开(公告)号：US06339872B1

公开(公告)日：2002-01-22

申请号：US09564155

申请日：2000-05-03

Applicant: Thomas Young Chang ,  Edward Hinpong Lee ,  Jyh-Shuey Jerry Lo

Inventor： Thomas Young Chang ,  Edward Hinpong Lee ,  Jyh-Shuey Jerry Lo

IPC: G11B542

CPC classification number: G11B5/3967 ,  G11B5/024 ,  G11B5/23 ,  G11B5/232 ,  G11B5/3116 ,  G11B5/3163 ,  Y10T29/49044 ,  Y10T29/49046

Abstract: A single-sided, notched write head is provided for writing narrow erase band servo tracks as well as a double-notched write head, and for writing data tracks better than a double-notched write head. The single-sided, notched write head writes a narrow erase band on the notched side and a wide erase band on the unnotched side. In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment a first side of the first pole piece layer is notched more than a second side. By writing servo tracks only a fraction of the track width of the write head, a wide erase band region is overwritten so that a narrow erase band is on each side of the servo track. Data tracks are written with a narrow erase band on one side and a wide erase band on the other side. The wide erase band on one side of the data track allows more flexibility in spacing the read head from adjacent tracks. The single-sided, notched write head can be manufactured with methods that require less processing time than a double-notched write head. In one method, a notching layer is employed where removal of a small corner of the notching layer provides the first pole piece with a notch. Other methods employ photoresist to protect the side of the first pole piece that is not to be notched, and/or oscillating the workpiece less than 360°C. so that milling is more concentrated at the notch site.

Abstract translation: 提供单面，带缺口的写入头，用于写入窄擦除带伺服磁道以及双切口写入头，并且用于比双切口写入头更好地写入数据轨道。 单面缺口写头在缺口侧写入窄擦除带，并在无缺口侧写入宽擦除带。 在一个实施例中，仅第一极靴层的一侧被切口，而在另一实施例中，第一极靴层的第一侧比第二侧更多地被切口。 通过仅将写入磁道的磁道宽度的一部分写入伺服磁道，将覆盖宽的擦除带区域，使得在伺服磁道的每一侧上存在窄的擦除带。 数据磁道在一侧写入窄的擦除频带，另一侧写入宽的擦除频带。 在数据轨道的一侧上的宽擦除带允许在读取头与相邻轨道间隔距离方面更加灵活。 单面，缺口写头可以使用比双切口写头要少的处理时间的方法制造。 在一种方法中，采用切口层，其中切口凹陷层的小角的移除为第一极片提供凹口。 其他方法使用光致抗蚀剂来保护第一极靴的不被切口的一侧，和/或使工件摆动小于360℃。 使得铣削更集中在切口部位。

公开(公告)号：US06330128B1

公开(公告)日：2001-12-11

申请号：US09299542

申请日：1999-04-26

Applicant: Thomas Young Chang ,  Glen Adam Garfunkel ,  Edward Hin Pong Lee ,  Neil Leslie Robertson ,  Samuel Wonder Yuan

Inventor： Thomas Young Chang ,  Glen Adam Garfunkel ,  Edward Hin Pong Lee ,  Neil Leslie Robertson ,  Samuel Wonder Yuan

IPC: G11B5147

CPC classification number: G11B5/3103 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3146 ,  G11B5/3967 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/4906

Abstract: A magnetic head assembly has an open yoke type write head constructed on top of a read head so that the write head can be constructed with a very narrow track width without restraint by the requirements of the read head. The write head has first and second pole piece portions wherein the second pole piece portion has separate front and back layer portions. A coil layer is wrapped around only the first pole piece portion and the back layer portion so that the front layer portion can be constructed separately to provide a narrow track width. Further, in a preferred embodiment the front layer portion has a reduced thickness and a higher magnetic moment than the thickness and magnetic moment of the first pole piece portion and the back layer portion. Still further, in a preferred embodiment the first pole piece portion and the back layer portion are planar due to planarization of underlying layers.

Abstract translation: 磁头组件具有构造在读头的顶部上的开式轭型写入头，使得写入头可以被构造成具有非常窄的轨道宽度，而不受读取头的要求的限制。 写头具有第一和第二极靴部分，其中第二极靴部分具有分离的前部和后部部分。 线圈层仅缠绕在第一极靴部分和背层部分上，使得前层部分可以分开构造以提供窄的轨道宽度。 此外，在优选实施例中，前层部分具有比第一极靴部分和背部部分的厚度和磁矩更小的厚度和更高的磁矩。 此外，在优选实施例中，由于下层的平坦化，第一极片部分和背层部分是平面的。

公开(公告)号：US06201670B1

公开(公告)日：2001-03-13

申请号：US08876451

申请日：1997-06-16

Applicant: Thomas Young Chang ,  Edward Hinpong Lee ,  Jyh-Shuey Jerry Lo

Inventor： Thomas Young Chang ,  Edward Hinpong Lee ,  Jyh-Shuey Jerry Lo

IPC: G11B539

CPC classification number: G11B5/3967 ,  G11B5/024 ,  G11B5/23 ,  G11B5/232 ,  G11B5/3116 ,  G11B5/3163 ,  Y10T29/49044 ,  Y10T29/49046

Abstract: A single-sided, notched write head is provided for writing narrow erase band servo tracks as well as a double-notched write head, and for writing data tracks better than a double-notched write head. The single-sided, notched write head writes a narrow erase band on the notched side and a wide erase band on the unnotched side. In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment a first side of the first pole piece layer is notched more than a second side. By writing servo tracks only a fraction of the track width of the write head, a wide erase band region is overwritten so that a narrow erase band is on each side of the servo track. Data tracks are written with a narrow erase band on one side and a wide erase band on the other side. The wide erase band on one side of the data track allows more flexibility in spacing the read head from adjacent tracks. The single-sided, notched write head can be manufactured with methods that require less processing time than a double-notched write head. In one method, a notching layer is employed where removal of a small corner of the notching layer provides the first pole piece with a notch. Other methods employ photoresist to protect the side of the first pole piece that is not to be notched, and/or oscillating the workpiece less than 360°, so that milling is more concentrated at the notch site.

Abstract translation: 提供单面，带缺口的写入头，用于写入窄擦除带伺服磁道以及双切口写入头，并且用于比双切口写入头更好地写入数据轨道。 单面缺口写头在缺口侧写入窄擦除带，并在无缺口侧写入宽擦除带。 在一个实施例中，仅第一极靴层的一侧被切口，而在另一实施例中，第一极靴层的第一侧比第二侧更多地被切口。 通过仅将写入磁道的磁道宽度的一部分写入伺服磁道，将覆盖宽的擦除带区域，使得在伺服磁道的每一侧上存在窄的擦除带。 数据磁道在一侧写入窄的擦除频带，另一侧写入宽的擦除频带。 在数据轨道的一侧上的宽擦除带允许在读取头与相邻轨道间隔距离方面更加灵活。 单面，缺口写头可以使用比双切口写头要少的处理时间的方法制造。 在一种方法中，采用切口层，其中切口凹陷层的小角的移除为第一极片提供凹口。 其他方法使用光致抗蚀剂来保护第一极片的不被切口的一侧和/或使工件摆动小于360°，使得铣削更集中在切口部位。

公开(公告)号：US06069775A

公开(公告)日：2000-05-30

申请号：US996433

申请日：1997-12-22

Applicant: Thomas Young Chang ,  Jyh-Shuey Jerry Lo

Inventor： Thomas Young Chang ,  Jyh-Shuey Jerry Lo

IPC: G11B5/012 ,  G11B5/31 ,  G11B5/39 ,  G11B5/127

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/3116 ,  G11B5/3146 ,  G11B5/3163 ,  G11B2005/3996 ,  G11B5/012 ,  G11B5/3967 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49052

Abstract: A method makes an inverted merged MR head with a second pole tip layer which is self-aligned with a top first pole tip layer. After forming a bottom first pole tip layer, which is relatively thin and relatively wide, a top first pole tip layer is formed thereon with a width that defines the track width of the merged MR head. A second pole tip forming layer is formed on the top first pole tip layer and layers adjacent both sides of the top first pole tip layer. The forming layer and the top first pole tip layer are lapped so that their top surfaces are flush with one another. Ion milling is then implemented to mill the top first pole tip layer at a faster rate than the forming layer causing a recess that is defined by a top surface of the top first pole tip layer and inclined surfaces of the forming layer immediately adjacent thereto. After formation of a write gap layer in the recess a second pole tip layer is formed in a recess replicated by the write gap layer causing a bottom base portion of the second pole tip layer to be substantially the same width as the track width and aligned with the top first pole tip layer so that flux can be transferred between the pole tips more narrowly confined within the track width.

Abstract translation: 一种方法使得具有与顶部第一极尖端层自对准的第二极尖端层的反向合并MR头。 在形成相当薄且相对宽的底部第一极尖端层之后，在其上形成顶部第一极尖端层，其宽度限定了合并的MR头的轨道宽度。 第二极尖形成层形成在顶部第一极尖端层和邻近顶部第一极尖端层两侧的层。 成形层和顶部第一极尖端层被重叠，使得它们的顶表面彼此齐平。 然后实施离子铣削，以比形成层更快的速度铣削顶部第一极尖端层，所述形成层形成由顶部第一极尖端层的顶表面和紧邻其的形成层的倾斜表面限定的凹部。 在凹部中形成写间隙层后，在由写间隙层复制的凹部中形成第二极尖端层，使第二极尖端层的底部基部与轨道宽度基本相同的宽度并与 顶部的第一极尖端层，使得焊剂可以在极尖之间传输更狭窄地限制在轨道宽度内。

公开(公告)号：US06747850B1

公开(公告)日：2004-06-08

申请号：US09721853

申请日：2000-11-24

Applicant: Thomas Young Chang ,  Edward Hinpong Lee ,  Jyh-Shuey Jerry Lo

Inventor： Thomas Young Chang ,  Edward Hinpong Lee ,  Jyh-Shuey Jerry Lo

IPC: G11B539

CPC classification number: G11B5/3967 ,  G11B5/024 ,  G11B5/23 ,  G11B5/232 ,  G11B5/3116 ,  G11B5/3163 ,  Y10T29/49044 ,  Y10T29/49046

Abstract: A single-sided, notched write head is provided for writing narrow erase band servo tracks as well as a double-notched write head, and for writing data tracks better than a double-notched write head. The single-sided, notched write head writes a narrow erase band on the notched side and a wide erase band on the unnotched side. In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment a first side of the first pole piece layer is notched more than a second side. By writing servo tracks only a fraction of the track width of the write head, a wide erase band region is overwritten so that a narrow erase band is on each side of the servo track. Data tracks are written with a narrow erase band on one side and a wide erase band on the other side. The wide erase band on one side of the data track allows more flexibility in spacing the read head from adjacent tracks. The single-sided, notched write head can be manufactured with methods that require less processing time than a double-notched write head. In one method, a notching layer is employed where removal of a small corner of the notching layer provides the first pole piece with a notch. Other methods employ photoresist to protect the side of the first pole piece that is not to be notched, and/or oscillating the workpiece less than 360° so that milling is more concentrated at the notch site.

Abstract translation: 提供单面，带缺口的写入头，用于写入窄擦除带伺服磁道以及双切口写入头，并且用于比双切口写入头更好地写入数据轨道。 单面缺口写头在缺口侧写入窄擦除带，并在无缺口侧写入宽擦除带。 在一个实施例中，仅第一极靴层的一侧被切口，而在另一实施例中，第一极靴层的第一侧比第二侧更多地被切口。 通过仅将写入磁道的磁道宽度的一部分写入伺服磁道，将覆盖宽的擦除带区域，使得在伺服磁道的每一侧上存在窄的擦除带。 数据磁道在一侧写入窄的擦除频带，另一侧写入宽的擦除频带。 在数据轨道的一侧上的宽擦除带允许在读取头与相邻轨道间隔距离方面更加灵活。 单面，缺口写头可以使用比双切口写头要少的处理时间的方法制造。 在一种方法中，采用切口层，其中切口凹陷层的小角的移除为第一极片提供凹口。 其他方法使用光致抗蚀剂来保护第一极靴的不被切口的一侧和/或使工件摆动小于360°，使得铣削更集中在切口部位。

公开(公告)号：US06683759B1

公开(公告)日：2004-01-27

申请号：US09549802

申请日：2000-04-14

Applicant: Thomas Young Chang ,  Edward Hinpong Lee ,  Jhy-Shuey Jerry Lo

Inventor： Thomas Young Chang ,  Edward Hinpong Lee ,  Jhy-Shuey Jerry Lo

IPC: G11B5127

CPC classification number: G11B5/3967 ,  G11B5/3116 ,  G11B5/3163 ,  Y10T29/49044 ,  Y10T29/49048

Abstract: In the manufacture of a combined magnetic head, milling time for notching a first pole piece of the head's write element is reduced by constructing the first pole piece with a notching layer on a first pole piece layer, the notching layer having first and second corners adjacent first and second side walls of the second pole tip. The first pole piece layer has a wide lateral expanse, and the notching layer has a narrow lateral expanse. The width of the notching layer is preferably 0.2 &mgr;m to 2.0 &mgr;m wider than a target track width of the second pole tip. With this arrangement, the notching layer has first and second side walls that project 0.10 &mgr;m to 1.0 &mgr;m. laterally, beyond first and second side walls, respectively, of the second pole tip. The thickness of the notching layer is preferably between 0.1 &mgr;m to 1.0 &mgr;m. Accordingly, full notching of the notching layer can be achieved by milling a small-corner in a range of 0.10 &mgr;m by 0.10 &mgr;m to 1.0 &mgr;m by 1.0 &mgr;m, as seen in an ABS view. The gap layer is formed on the notching layer, followed by forming the second pole tip on the gap layer. Milling at an angle is then employed to mill through the gap layer and notch the notching layer. In comparison to milling a prior art large lateral expanse of the first pole piece to achieve notching. milling the small corner of the notching layer requires a very short milling time. This results in less consumption of the second pole tip, so that better control of a final track width can be accomplished. Also, since there is less consumption of the top of the second pole tip, the aspect ratio of photoresist employed to construct the second pole tip is reduced, so as to enhance the line width of the second pole tip. Further, there is less redeposited material to clean up after the milling cycle. All of these factors reduce the process time and increase manufacturing throughput.

Abstract translation: 在组合磁头的制造中，通过在第一极片层上构造具有切口层的第一极靴来减小头部写入元件的第一极靴的切割的铣削时间，该切口层具有第一和第二角部相邻 第二极尖的第一和第二侧壁。 第一极片层具有宽的横向宽度，并且开槽层具有窄的横向宽度。 切口层的宽度比第二极尖的目标轨道宽度优选为0.2μm〜2.0μm。 通过这种布置，切口层具有将0.10mum调整到1.0μm的第一和第二侧壁。 分别横跨第二极尖的第一和第二侧壁。 切口层的厚度优选为0.1μm〜1.0μm。 因此，如ABS视图所示，通过将0.10μm至0.10μm的范围内的小角度铣削1.0μm，可以实现切口层的完全切口。 间隙层形成在切口层上，随后在间隙层上形成第二极尖。 然后采用一定角度铣削通过间隙层并切开切口层。 与铣削现有技术的第一极片的大侧向宽度相比，以实现开槽。 铣削开槽层的小角度需要非常短的铣削时间。 这导致较少的第二极尖的消耗，使得可以实现对最终轨道宽度的更好的控制。 此外，由于第二极尖的顶部的消耗较少，所以用于构造第二极尖的光致抗蚀剂的纵横比减小，从而增强第二极尖的线宽。 此外，在研磨循环之后，清除较少的再沉积材料。 所有这些因素减少了处理时间并提高了生产量。

公开(公告)号：US06477008B1

公开(公告)日：2002-11-05

申请号：US09317668

申请日：1999-05-24

Applicant: Thomas Young Chang ,  Shanlin Duan ,  Terence Tin-Lok Lam ,  Wai C. Leung

Inventor： Thomas Young Chang ,  Shanlin Duan ,  Terence Tin-Lok Lam ,  Wai C. Leung

IPC: G11B5115

CPC classification number: G11B5/3103 ,  G11B5/11 ,  G11B5/3143 ,  G11B5/3967

Abstract: The present invention is a read/write head for writing information to magnetic media and reading information from magnetic media. It includes a write head element for writing information onto magnetic media, a read head element for reading information from the magnetic media, and an electromagnetic field shield element that is disposed between the write head element and the read head element. The shield functions to shield the read head from electromagnetic field energy created by the write head element. An enhanced second embodiment includes an electrical circuit element that is disposed proximate the read head element that functions to generate an electromagnetic field at the read head element that is generally oppositely directed to the electromagnetic field generated by the write head element to reduce the total electromagnetic field that the read head element is exposed to during a writing operation. The method for operating the read/write head in a hard disk drive, includes the steps of writing data onto a hard disk and reading data from the hard disk simultaneously with the data writing. This is accomplished by shielding the read head from the electromagnetic field energy generated during the data writing by utilizing the electromagnetic field shield element that is disposed between the write head element and the said read head element. The electrical circuit element of the second embodiment is preferably interconnected with the write head electric circuit.

Abstract translation: 本发明是一种用于向磁性介质写入信息并从磁性介质读取信息的读/写头。 它包括用于将信息写入磁介质的写入头元件，用于从磁性介质读取信息的读取头元件以及设置在写入头元件和读取头元件之间的电磁场屏蔽元件。 屏蔽功能用于屏蔽读取头与写入头元件产生的电磁场能量。 增强的第二实施例包括设置在读头元件附近的电路元件，其功能是在读头元件处产生电磁场，该磁头元件通常与写头元件产生的电磁场相反地指向以减小总电磁场 读写头元件在写操作期间被暴露。 用于在硬盘驱动器中操作读/写头的方法包括以下步骤：将数据写入硬盘并且与数据写入同时从硬盘读取数据。 这是通过利用设置在写头元件和所述读头元件之间的电磁场屏蔽元件来屏蔽读头从数据写入期间产生的电磁场能量。 第二实施例的电路元件优选地与写入头电路互连。

公开(公告)号：US06330122B1

公开(公告)日：2001-12-11

申请号：US09317664

申请日：1999-05-24

Applicant: Thomas Young Chang ,  Shanlin Duan ,  Terence Tin-Lok Lam ,  Wai C. Leung

Inventor： Thomas Young Chang ,  Shanlin Duan ,  Terence Tin-Lok Lam ,  Wai C. Leung

IPC: G11B2736

CPC classification number: G11B27/36 ,  G01R33/1207 ,  G11B5/012 ,  G11B5/4886 ,  G11B20/1816 ,  G11B2005/001 ,  G11B2220/20

Abstract: The hard disk testing and certifying device of the present invention includes a spin stand to rotate a disk to be tested. A single read/write head, including both a write head and a read head is mounted upon an armature which movably supports the read/write head. The device includes a computerized control system and signal processing system that provides write signals to the write head and receives and processes read head signals from the read head. In the preferred embodiment the read/write head simultaneously provides write signals to the disk and receives read signals from the disk. Preferably, the read/write head functions continually and the certification testing is conducted utilizing a spiral path. In the preferred read/write head the read head is disposed behind the write head and an electromagnetic field shield is disposed between them to reduce electromagnetic field interference between the write head and the read head during simultaneous operation. The read/write head may also include an electromagnetic field interference element to further reduce signal interference at the read head.

Abstract translation: 本发明的硬盘测试和认证装置包括旋转待测试盘的旋转架。 包括写入头和读取头的单个读/写头安装在可移动地支撑读/写头的电枢上。 该装置包括计算机控制系统和信号处理系统，其向写入头提供写入信号，并从读取头接收并处理读取头信号。 在优选实施例中，读/写头同时向盘提供写信号并从盘接收读信号。 优选地，读/写头连续工作，并且使用螺旋路径进行认证测试。 在优选的读/写头中，读头设置在写头后面，电磁场屏蔽设置在它们之间，以在同时操作期间减小写头和读头之间的电磁场干扰。 读/写头还可以包括电磁场干扰元件，以进一步减少读头的信号干扰。