公开(公告)号：US20120249130A1

公开(公告)日：2012-10-04

申请号：US13067887

申请日：2011-07-01

申请人： Siuman MOK ,  Hokei LAM ,  Cheukwing LEUNG ,  Juren DING ,  Rongkwang NI ,  Wanyin KWAN ,  Cheukman LUI ,  Chiuming LUENG

发明人： Siuman MOK ,  Hokei LAM ,  Cheukwing LEUNG ,  Juren DING ,  Rongkwang NI ,  Wanyin KWAN ,  Cheukman LUI ,  Chiuming LUENG

IPC分类号： G01R33/18

CPC分类号： G01R33/098

摘要： A method for measuring longitudinal bias magnetic field in a tunnel magnetoresistive sensor of a magnetic head, the method includes the steps of: applying an external longitudinal time-changing magnetic field onto the tunnel magnetoresistive sensor; determining a shield saturation value of the tunnel magnetoresistive sensor under the application of the external longitudinal time-changing magnetic field; applying an external transverse time-changing magnetic field and an external longitudinal DC magnetic field onto the tunnel magnetoresistive sensor; determining a plurality of different output amplitudes under the application of the external transverse time-changing magnetic field and the application of different field strength values of the external longitudinal DC magnetic field; plotting a graph according to the different output amplitudes and the different field strength values; and determining the strength of the longitudinal bias magnetic field according to the graph and the shield saturation value.

摘要翻译： 一种用于测量磁头的隧道磁阻传感器中的纵向偏置磁场的方法，所述方法包括以下步骤：将外部纵向时变磁场施加到隧道磁阻传感器上; 在外部纵向时变磁场的应用下，确定隧道磁阻传感器的屏蔽饱和度值; 将外部横向时变磁场和外部纵向直流磁场施加到隧道磁阻传感器上; 在外部横向时变磁场的应用和外部纵向直流磁场的不同场强值的应用中确定多个不同的输出幅度; 根据不同的输出幅度和不同的场强值绘制图形; 并根据曲线图和屏蔽饱和度值确定纵向偏置磁场的强度。

公开(公告)号：US20130114387A1

公开(公告)日：2013-05-09

申请号：US13289399

申请日：2011-11-04

申请人： Chiu ming LUENG ,  Mankit LEE ,  Cheukwing LEUNG ,  Ju ren DING ,  Rong kwang NI

发明人： Chiu ming LUENG ,  Mankit LEE ,  Cheukwing LEUNG ,  Ju ren DING ,  Rong kwang NI

IPC分类号： G11B5/455

CPC分类号： G11B5/455

摘要： Measuring method of a magnetic head includes (a) placing the magnetic head at normal position, defining a first direction parallel to an air bearing surface and two shielding layers of the magnetic head, and defining a second direction perpendicular to the first direction; (b) tilting the magnetic head at an angle to the second direction, applying a plurality of first magnetic fields with different intensities in the first direction, and measuring out a first output parameter curve; (c) repeating the step (b) with different angles and measuring out a plurality of first output parameter curves; (d) calculating a plurality of pinned direction tilt ratios that a pinned direction of a pinned layer of the magnetic head tilts towards the second direction according to the parameter curves; and (e) calculating a pinned direction tilt angle that the pinned direction tilts towards the second direction according to the pinned direction tilting ratios.

摘要翻译： 磁头的测量方法包括（a）将磁头放置在正常位置，限定平行于空气支承表面的第一方向和磁头的两个屏蔽层，并限定垂直于第一方向的第二方向; （b）使磁头与第二方向成一角度倾斜，在第一方向施加多个具有不同强度的第一磁场，并测量第一输出参数曲线; （c）以不同的角度重复步骤（b）并测量多个第一输出参数曲线; （d）根据所述参数曲线计算所述磁头的被钉扎层的钉扎方向朝向所述第二方向倾斜的多个钉扎方向倾斜比; 以及（e）根据被钉扎方向倾斜比计算销钉方向朝向第二方向倾斜的钉扎方向倾斜角度。