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Areal Density Improvement of Perpendicular Magnetic Recording (PMR) Write Head by Tuning Magnetic Flux Loops

  • US 20170148473A1
  • Filed: 11/20/2015
  • Published: 05/25/2017
  • Est. Priority Date: 11/20/2015
  • Status: Active Grant
First Claim
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1. A PMR writer, comprising:

  • (a) a first trailing shield layer formed on a write gap and adjoining an air bearing surface (ABS), the write gap contacts a top surface of a front portion of a main pole layer at the ABS;

    (b) a second (PP3) trailing shield that adjoins a top surface of the first trailing shield layer and extends toward a back end of the PMR writer where the PP3 trailing shield contacts a top yoke formed on a top surface of a back portion of the main pole layer;

    (c) a leading shield with a top surface contacting a bottom surface of a leading gap at the ABS, the leading gap has a top surface adjoining a bottom surface of the front portion of the main pole layer at the ABS;

    (d) a leading shield connector (LSC) that contacts a bottom surface of the leading shield and extends from the ABS toward a back end of the PMR writer;

    (e) a shield connector that is recessed from the ABS and adjoins a bottom surface of the LSC and a top surface of a return path layer (RTP);

    (f) the RTP with an ABS facing side that is recessed from the ABS and with a top surface that is parallel to the main pole layer bottom surface; and

    (g) a back gap connection (BGC) that is a via filled with a magnetic material and connects the top surface of the RTP to a bottom surface of the back portion of the main pole layer wherein a magnitude of magnetic flux in a return pathway from a magnetic medium through the leading shield, SLC, shield connector, RTP, and BGC to the main pole layer is substantially less than a magnitude of magnetic flux returning from the magnetic medium to the main pole layer through the first trailing shield and PP3 trailing shield.

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