公开(公告)号：US20050018347A1

公开(公告)日：2005-01-27

申请号：US10624656

申请日：2003-07-21

申请人： Wen-Chien Hsiao ,  Quan-Chiu Lam

发明人： Wen-Chien Hsiao ,  Quan-Chiu Lam

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/10 ,  G11B5/17 ,  G11B5/31 ,  G11B5/39

CPC分类号： G11B5/3133 ,  G11B5/012 ,  G11B5/17 ,  G11B5/3103 ,  G11B5/3113 ,  G11B5/3116 ,  G11B5/3143 ,  G11B5/3967 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0008 ,  G11B2005/0013

摘要： The magnetic head is formed with a narrow pole tip, and a pole tip heating element is fabricated to reduce the pole tip stress and increase its permeability, such that the magnetization switching speed of the pole tip is increased. The heating element is preferably electrically interconnected within the induction coil circuit of the magnetic head, such that the electrical current flowing through the induction coil also flows through the heating element. In a preferred embodiment, the heating element is fabricated above the second magnetic pole. The heating element is preferably formed with a resistance of approximately 0.2 to 1.0 ohms, such that the approximately 40 mA current that flows through the induction coil and the heating element creates a heating energy of the heating element of approximately 0.3 to 1.6 mW. The heating element can be comprised of a variety of materials such as Cu, W, NiFe, NiCr and IrRh.

摘要翻译： 磁头形成有窄极尖，并且制造极尖加热元件以减小极尖应力并增加其磁导率，使得极尖的磁化转换速度增加。 加热元件优选地在磁头的感应线圈电路内电互连，使得流过感应线圈的电流也流过加热元件。 在优选实施例中，加热元件制造在第二磁极之上。 加热元件优选地形成有大约0.2至1.0欧姆的电阻，使得流过感应线圈和加热元件的大约40mA的电流产生大约0.3至1.6mW的加热元件的加热能量。 加热元件可以由诸如Cu，W，NiFe，NiCr和IrRh的各种材料组成。

公开(公告)号：US20050024768A1

公开(公告)日：2005-02-03

申请号：US10628790

申请日：2003-07-28

申请人： Quan-Chiu Lam

发明人： Quan-Chiu Lam

IPC分类号： G11B5/147 ,  G11B5/39

CPC分类号： G11B5/3932

摘要： An apparatus for providing transverse magnetic bias proximate to a pole tip to speed up the switching time of the pole-tip during the writing operation is disclosed. The transverse field disposed proximate the pole-tip helps the conventional driving field in rotating the magnetization through the first 90-degrees, especially at small angle where the effective anisotropy-field is strongest in opposing the conventional driving field. By offsetting the magnetization from its easy-axis, the transverse field also increases the torque that the collinear driving field would have on the magnetization.

摘要翻译： 公开了一种在写入操作期间提供靠近极尖的横向磁偏压以加速极尖的切换时间的装置。 设置在极尖附近的横向场有助于传统的驱动场，使磁化旋转第一个90度，特别是在与常规驱动场相反的有效各向异性场最强的小角度。 通过使磁化强度从容易轴偏移，横向磁场也增加了共线驱动磁场对磁化的影响。

公开(公告)号：US20050120544A1

公开(公告)日：2005-06-09

申请号：US10730687

申请日：2003-12-08

申请人： Quan-Chiu Lam

发明人： Quan-Chiu Lam

IPC分类号： G11B5/127

CPC分类号： G11B5/1272 ,  Y10T29/49021 ,  Y10T29/49032 ,  Y10T29/49034

摘要： A pole piece of a magnetic write head is formed over a substrate and includes a pole tip having a width that is less than its height which is normal the substrate. Due to stress-anisotropy, the pole tip structure has an inherent easy-axis which is oriented in an unfavorable direction (i.e. perpendicular to the ABS and almost collinear with a driving field of the write head). To alleviate this problem, during electroplating or annealing of the pole piece a magnetic field is applied to the pole tip in a direction which is out-of-plane from the substrate but in-plane with a side wall of the pole tip which vertically projects from the substrate. By applying the magnetic field in this manner, the easy axis of the pole piece is oriented in the direction of the applied magnetic field to facilitate more efficient switching in the write head. Ideally, the angle θ is about 90° for Hexagonal-Closed Packed (HCP) materials or about 50° for Face-Centered Cubic or Body-Centered Cubic (BCC) materials (e.g. NiFe and CoFe).

摘要翻译： 磁性写头的极片形成在衬底上，并且包括具有小于其垂直于衬底的高度的宽度的极尖。 由于应力各向异性，极尖结构具有固有的容易轴，其以不利的方向（即垂直于ABS并且与写入头的驱动场几乎共线）定向。 为了减轻这个问题，在极片的电镀或退火过程中，磁极沿着与基板不平面的方向施加到磁极尖端，但是与磁极端部的侧壁垂直地突出 从底物。 通过以这种方式施加磁场，极片的容易轴在施加的磁场的方向上取向，以便于在写入头中更有效的切换。 理想情况下，六角封闭填料（HCP）材料的角度θ约为90°，面心立方或体心立方（BCC）材料（如NiFe和CoFe）的角度θ约为50°。

公开(公告)号：US20050024177A1

公开(公告)日：2005-02-03

申请号：US10628646

申请日：2003-07-28

申请人： Quan-Chiu Lam

发明人： Quan-Chiu Lam

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  H01F13/00 ,  H01F17/00 ,  H01F5/00

CPC分类号： G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0008 ,  G11B2005/0013 ,  H01F13/00 ,  H01F17/0006

摘要： A method for providing transverse magnetic bias proximate to a pole tip to speed up the switching time of the pole-tip during the writing operation is disclosed. The transverse field disposed proximate the pole-tip helps the conventional driving field in rotating the magnetization through the first 90-degrees, especially at small angle where the effective anisotropy-field is strongest in opposing the conventional driving field. By offsetting the magnetization from its easy-axis, the transverse field also increases the torque that the collinear driving field would have on the magnetization.

摘要翻译： 公开了一种在写入操作期间提供靠近极尖的横向磁偏压以加速极尖的切换时间的方法。 设置在极尖附近的横向场有助于传统的驱动场，使磁化旋转第一个90度，特别是在与常规驱动场相反的有效各向异性场最强的小角度。 通过使磁化强度从容易轴偏移，横向磁场也增加了共线驱动磁场对磁化的影响。