Current-in-Plane GMR Trilayer Head Design for Hard-Disk Drives: Characterization and Extendibility
Current-in-Plane GMR Trilayer Head Design for Hard-Disk Drives: Characterization and Extendibility
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适用于硬盘驱动器的电流面 GMR 三层磁头设计：特性和可扩展性
DOI：
10.1109/tmag.2006.888213
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发表时间：
2007
影响因子：
2.1
通讯作者：
S. Mao
中科院分区：
文献类型：
--
作者：
R. Lamberton;M. Seigler;K. Pelhos;H. Zhou;M. McCurry;M. Ormston;G. Yi;G. McClean;T. Mclaughlin;P. Kolbo;O. Heininen;V. Sapozhnikov;S. Mao
本文综述了平面内巨磁阻（GMR）三层读回传感器（CIP-3L），该传感器仅在GMR堆栈的后边缘使用一个永磁体来稳定和偏置双自由层系统。微磁模拟表明，该设计提高了相邻结（ABJ）隧道磁阻（TMR）头设计的效率。实验评估了永磁体厚度（PM Th）、层间交换耦合(J)和条纹高度如何影响CIP-3L原型磁头的信噪比、对称性和稳定性。研究表明，PM Th >400 nm， J<-0.8 erg/cm2，读取宽度与SH长宽比为1:1至0.75:1，可以获得最佳的传递曲线性能。与同类最佳TMR读取器的垂直记录媒体上的头万向架组件旋转比较表明，尽管CIP-3L头的振幅较低（据信与过程相关），但对称性，稳定性，最重要的是，归一化到电写入宽度和读取宽度的误码率是相当的。此外，CIP-3L设计比TMR磁头具有更好的线性度和低频噪声性能。最佳的CIP-3L磁头的面密度性能为195gb /in2的记录能力和1100kbpi的线性密度
The current-in-plane giant magnetoresistive (GMR) trilayer readback sensor (CIP-3L), where only one permanent magnet at the back edge of the GMR stack is used to stabilize and bias a dual free layer system, is reviewed. Micromagnetic modeling is employed to show that the design has improved efficiency over abutted junction (ABJ) tunneling magnetoresistive (TMR) head designs. An experimental evaluation of how permanent magnet thickness (PM Th), interlayer exchange coupling (J), and stripe height impact the signal-to-noise ratio, symmetry, and stability of prototype CIP-3L heads is conducted. The study indicates that PM Th >400 nm, J<-0.8 erg/cm2, and a read width to SH aspect ratio of 1:1 to 0.75:1, gives optimal transfer curve performance. A head gimbal assembly spinstand comparison on perpendicular recording media with best-in-class TMR readers shows that although the amplitude of the CIP-3L heads is lower (believed to be process related), the symmetry, stability, and most important, bit-error rate normalized to electrical write width and read width, are comparable. In addition, the CIP-3L design shows better linearity and low-frequency noise performance than TMR heads. The areal density performance of the best CIP-3L heads shows 195 Gb/in2 recording capability and linear densities of 1100 kbpi