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Magnetic read head structure with improved bottom shield design for better reader performance

机译:磁性读头结构,具有改进的底部屏蔽设计,可用于更好的读者性能

摘要

A bottom shield in a read head is modified by including a non-magnetic decoupling layer and second magnetic layer on a conventional first magnetic layer. The second magnetic layer has a magnetization that is not exchange coupled to the first magnetic layer, and a domain structure that is not directly affected by stray fields due to domain wall motion in the first magnetic layer. Accordingly, the modified bottom shield reduces shield related noise on the reader and will provide improved signal to noise (SNR) ratio and better reader stability. The second magnetic layer may be further stabilized with one or both of an antiferromagnetic coupling scheme, and insertion of an antiferromagnetic pinning layer. In dual readers, the modified bottom shield is used in either the bottom or top reader although in the latter, first magnetic layer thickness is reduced to maintain reader-to-reader spacing and acceptable bit error rate (BER).
机译:通过在传统的第一磁性层上包括非磁性去耦层和第二磁性层来改变读头中的底部屏蔽。第二磁层具有不交换耦合到第一磁层的磁化,并且由于第一磁性层中的畴壁运动而不受杂散场的直接影响的畴结构。因此,修改的底部屏蔽在读取器上减少了屏蔽相关噪声,并将提供改进的噪声(SNR)比和更好的读取器稳定性。第二磁性层可以用反铁磁耦合方案的一个或两个进一步稳定,并插入反铁磁钉钉扎层。在双读取器中,改进的底屏蔽在底部或顶部读取器中使用,尽管在后者中,减小了第一磁性层厚度以维持读取器到读取器间距和可接受的塔错误率(BER)。

著录项

  • 公开/公告号US11024333B2

    专利类型

  • 公开/公告日2021-06-01

    原文格式PDF

  • 申请/专利权人 HEADWAY TECHNOLOGIES INC.;

    申请/专利号US201916715538

  • 发明设计人 YAN WU;

    申请日2019-12-16

  • 分类号G11B5/39;G11B5/11;

  • 国家 US

  • 入库时间 2022-08-24 19:03:31

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