Tunable Pole Side Bridge for PMR Write Head Protrusion Control
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Solution Overview
Problem
Existing perpendicular magnetic recording (PMR) write heads face challenges in achieving optimal write-ability and high-frequency response due to limitations in pole protrusion control and bias field generation.
Innovation Solution
The implementation of a Tunable Pole Protrusion or Tunable Pole Performance (TPP) side bridge design in the PMR write head, which includes a main pole, a hot seed portion, a write shield, and a bias circuit with a metallic side bridge and oxide layer, allows for an electric current path to the main pole tip without altering the existing PMR pad layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional PMR write head design is used, then the structure is simple and manufacturing is easier, but write-ability is insufficient and high-frequency response is poor
Solution Approach 1:
The write head is segmented into distinct functional components: main pole, hot seed portion, write shield, and metallic side bridge. This segmentation allows each component to be optimized independently for its specific function while maintaining overall system performance.
Solution Approach 2:
The metallic side bridge provides a tunable electrical connection between the main pole and hot seed portion, allowing dynamic adjustment of the electrical current path. This enables optimization of pole protrusion and rotational coherence without fixed structural constraints.
2Productivity
If pole protrusion is increased to enhance write-ability, then storage density improves, but manufacturing precision requirements increase
Solution Approach 1:
The metallic side bridge allows adjustment of electrical parameters (current flow, resistance) that directly control pole protrusion magnitude. By changing electrical parameters rather than mechanical dimensions, manufacturing precision requirements are reduced while maintaining control over protrusion for optimized storage density.
3Speed
If a bias circuit with metallic side bridge is added, then high-frequency response improves through coherent rotation, but device complexity increases
Solution Approach 1:
The metallic side bridge merges the electrical connection function between main pole and hot seed portion with the structural support function. This integration achieves coherent rotation for improved high-frequency response while avoiding the need for separate, complex biasing mechanisms.
Solution Approach 2:
The metallic side bridge serves multiple functions simultaneously: providing electrical current path, establishing magnetic coupling, and enabling tunable pole protrusion. This multi-functionality reduces overall device complexity compared to using separate components for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances write-ability by increasing pole protrusion and improves high-frequency response by making the main pole and hot seed rotation more coherent, thereby increasing storage density and reliability.
Implementation Method 1
The bias circuit can direct an electrical current flow along an electrical path between the tip portion of the main pole and the write shield via the first metallic side bridge
Implementation Method 2
improves high-frequency response by making the main pole and hot seed rotation more coherent
Implementation Method 3
a bias circuit with a metallic side bridge and oxide layer
Data Source
AI summary
The present embodiments relate to a perpendicular magnetic recording (PMR) write head with a Tunable Pole Protrusion or Tunable Pole Performance (TPP) side bridge design. A PMR write head can include a main pole including a tip portion configured to be disposed at an air-bearing surface (ABS) and configured to interact with a magnetic recording medium. The PMR write head can also include a hot seed (HS) portion and a first write shield. The PMR write head can also include a first metallic side bridge disposed between the tip portion of the main pole and the HS portion. The PMR write head can also include a bias circuit including at least a first bias electrical pad and a second electrical bias pad directing an electrical current flow along an electrical path between the tip portion of the main pole and the write shield portion via the first metallic side bridge.