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1.发明授权Process for measuring nonlinear transition shift (NLTS) at high recording densities with a giant magetoresistive (GMR) head 失效用巨型阻抗（GMR）头在高记录密度下测量非线性过渡位移（NLTS）的过程公开(公告)号：US06788481B2
公开(公告)日：2004-09-07
申请号：US10104422
申请日：2002-03-21
IPC分类号： G11B2736
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/09 , G11B20/10009 , G11B27/36 , G11B2005/001 , G11B2005/3996 , Y10S977/934
摘要： A nonlinear transition shift (NLTS) measurement procedure for read/write heads employing a giant magnetoresistive (GMR) merged heads. The method of this invention includes the pulse-shape distortion effects on recording nonlinearity, which can significantly affect the existing theoretical formulae for calculating nonlinearity correction factor from measured partial erasure values, and second-order approximation of equation of NLTS and nonlinearity correction factor. Transition broadening effects (TBE) and partial erasure (PE) are incorporated in the NLTS measurement procedure to permit accurate isolation of the NLTS from the unrelated TBE/PE and GMR nonlinear transfer characteristic (NTC). First, a fifth harmonic elimination (5HE) test is performed at bit period T to measure a first nonlinearity value X. Then two partial erasure (PE) tests are done at two different densities, one below the PE threshold to measure a second nonlinearity value XS and the other at the same density as the 5HE test to measure a third nonlinearity value Xh. Finally, the NLTS is computed by combining the first, second and third nonlinearity values.
摘要翻译： 采用巨磁阻（GMR）合并磁头的读/写头的非线性转换偏移（NLTS）测量程序。 本发明的方法包括对记录非线性的脉冲形状失真影响，这可以显着影响现有的用于从测量的部分擦除值计算非线性校正因子的理论公式，以及NLTS和非线性校正因子等式的二阶近似。 过渡拓宽效应（TBE）和部分擦除（PE）被纳入到NLTS测量程序中，以允许NLTS与无关TBE / PE和GMR非线性传递特性（NTC）的精确隔离。 首先，在位周期T执行第五次谐波消除（5HE）测试以测量第一非线性值X.然后，以两个不同的密度进行两次部分擦除（PE）测试，一个低于PE阈值，以测量第二非线性值 XS和另一个与5HE测试相同的密度来测量第三非线性值Xh。 最后，通过组合第一，第二和第三非线性值来计算NLTS。
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