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Perpendicular magnetic recording (PMR) write head with patterned leading shield

  • US 10,014,021 B1
  • Filed: 05/15/2017
  • Issued: 07/03/2018
  • Est. Priority Date: 05/15/2017
  • Status: Active Grant
First Claim
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1. A perpendicular magnetic recording (PMR) writer, comprising:

  • (a) a main pole with a first leading side and a trailing side, and two sides that connect the first leading side with the trailing side, the first leading side adjoins a lead gap having a front side at an air bearing surface (ABS), and the trailing side has a track width at the ABS;

    (b) the lead gap that separates the first leading side and a leading shield; and

    (c) the leading shield with an upper layer having a first cross-track width, a front side at the ABS, a backside at a first height (a) from the ABS, an upper surface adjoining the lead gap, and a lower surface adjoining a top surface of a lower layer wherein the lower layer comprises;

    (1) a front side having the first cross-track width at the ABS;

    (2) a backside at a second height (b) from the ABS where b>

    a; and

    (3) the top surface that is orthogonal to the ABS, and wherein the lower layer has a notch with a first side that is parallel to the ABS, one end at the top surface, and is recessed a third height (v) from the ABS, and a second side that extends from a second end of the first side to the lower layer backside, the first side has a second cross-track width between two notch sidewalls that are equidistant from a center plane that bisects the leading shield and the main pole.

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