公开(公告)号：US20110134561A1

公开(公告)日：2011-06-09

申请号：US12632787

申请日：2009-12-07

申请人： Neil Smith ,  Petrus Antonius VanDerHeijden

发明人： Neil Smith ,  Petrus Antonius VanDerHeijden

IPC分类号： G11B5/02 ,  G11B5/127

CPC分类号： G11B5/3133 ,  G11B5/1278 ,  G11B2005/001 ,  G11B2005/0024

摘要： A microwave-assisted magnetic recording (MAMR) write head and system has a spin-torque oscillator (STO) located between the write pole of the write head and a trailing shield that alters the write field from the write pole. The STO is a stack of layers whose planes lie generally parallel to the X-Y plane of an X-Y-Z coordinate system, the stack including a ferromagnetic polarizer layer, a free ferromagnetic layer, and a nonmagnetic electrically conductive spacer between the polarizer layer and the free layer. In the presence of the write field from the write pole the polarizer layer has its magnetization oriented at an angle between 20 and 80 degrees, preferably between 30 and 70 degrees, with the Z-axis. In the presence of a direct electrical current through the STO stack, the free layer magnetization rotates or precesses about the Z-axis with a non-zero angle to the Z-axis.

摘要翻译： 微波辅助磁记录（MAMR）写头和系统具有位于写头的写极之间的自旋扭矩振荡器（STO）和从写极改变写入场的后屏蔽。 STO是其平面大致平行于X-Y-Z坐标系的X-Y平面的一叠层，该堆叠包括在偏振层和自由层之间的铁磁偏振器层，自由铁磁层和非磁性导电间隔物。 在写磁极存在写入场的情况下，偏振器层的磁化方向与Z轴成20度到80度之间，优选地在30度和70度之间的角度。 在存在通过STO堆叠的直接电流的情况下，自由层磁化围绕Z轴以与Z轴成非零角度的方式旋转或进动。

公开(公告)号：US07532432B2

公开(公告)日：2009-05-12

申请号：US11379858

申请日：2006-04-24

申请人： Yoshihiro Ikeda ,  Byron Hassberg Lengsfield, III ,  James Terrence Olson ,  Petrus Antonius VanDerHeijden

发明人： Yoshihiro Ikeda ,  Byron Hassberg Lengsfield, III ,  James Terrence Olson ,  Petrus Antonius VanDerHeijden

IPC分类号： G11B5/127 ,  G11B5/23

CPC分类号： G11B5/3116 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/3146 ,  G11B5/667

摘要： A perpendicular magnetic recording data storage system combines a perpendicular medium that has a thin low-magnetic-permeability or “soft” underlayer (SUL) with a recording head that has a trailing shield (TS) with a thick throat height, i.e., a thickness in a direction orthogonal to the recording layer of the medium. The SUL is thin enough and has a low enough magnetic permeability to become saturated in a region beneath the trailing gap of the head during writing, but the throat height of the TS is thick enough to prevent the TS from becoming magnetically saturated during writing. The magnetic saturation of the SUL during writing changes the magnetic reluctance such that more of the magnetic flux going through the SUL changes direction (“field undershoot”) and goes to the TS. If the permeability of the SUL is so low (e.g., close to unity) that the SUL does not magnetically saturate, field undershoot may still occur because the reluctance from the SUL to the TS is still smaller than the reluctance from the SUL to the return pole (RP). Field undershoot enables a high write field gradient, which results in narrower magnetic transitions.

摘要翻译： 垂直磁记录数据存储系统将具有薄的低磁导率或“软”底层（SUL）的垂直介质与具有厚的喉部高度的后挡板（TS）的记录头组合，即厚度 在与介质的记录层正交的方向上。 SUL足够薄并且在写入期间具有足够低的磁导率以在头部的拖尾间隙下方的区域饱和，但是TS的喉部高度足够厚以防止TS在写入期间变得磁饱和。 在写入期间SUL的磁饱和度改变磁阻，使得穿过SUL的更多的磁通量改变方向（“场下冲”）并且进入TS。 如果SUL的磁导率如此低（例如，接近于1），SUL不会磁饱和，则由于从SUL到TS的磁阻仍然小于从SUL到返回的磁阻，所以仍然可能发生场下冲 杆（RP）。 场下冲可实现高写磁场梯度，从而导致较小的磁转变。