Invention Grant
- Patent Title: Coil routing designs for dual and triple perpendicular magnetic recording (PMR) writers
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Application No.: US15966192Application Date: 2018-04-30
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Publication No.: US10777220B2Publication Date: 2020-09-15
- Inventor: Yue Liu , Ying Liu , Yuhui Tang
- Applicant: Headway Technologies, Inc.
- Applicant Address: US CA Milpitas
- Assignee: Headway Technologies, Inc.
- Current Assignee: Headway Technologies, Inc.
- Current Assignee Address: US CA Milpitas
- Agency: Saile Ackerman LLC
- Agent Stephen B. Ackerman
- Main IPC: G11B5/17
- IPC: G11B5/17 ; G11B5/29 ; G11B5/48 ; G11B5/127

Abstract:
Dual and triple PMR writers are disclosed wherein the number of writer pads required to energize the selected PMR writer is minimized to three or four, respectively, with a coil configuration wherein separate top coils are connected by separate interconnects or side taps to separate bottom coils. Either top coils or bottom coils may be linked to a common W− pad. Alternatively, there may be one bottom coil that allows all output current to flow to a common W− pad. Coils may have a pancake or helical shape. In dual PMR writer embodiments, there may be one or two dynamic fly height heater coils. Magnetic performance in the selected writer of a dual PMR writer is similar to that of a single PMR writer with regard to erase width in AC mode (EWAC), Hy field, trailing and side shield return fields, down-track and cross-track gradient.
Public/Granted literature
- US20190333531A1 Coil Routing Designs for Dual and Triple Perpendicular Magnetic Recording (PMR) Writers Public/Granted day:2019-10-31
Information query
IPC分类: