Current-Assisted HAMR Writer Pole Design
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Solution Overview
Problem
Current heat-assisted magnetic recording (HAMR) write heads face challenges in achieving high recording density due to high sector error rates, which are limited by the small surface area of the main pole and the resulting small recording field.
Innovation Solution
The HAMR write head design includes a waveguide and a main pole with a main pole tip, featuring one or more current paths through the main pole tip, with terminals coupled to shields, heat sink layers, or other components, generating assisting magnetic fields via bias currents through trailing or leading gap electrical connections to reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the main pole surface area is decreased to achieve higher recording density, then the recording density increases, but the recording field becomes smaller and sector error rate increases
Solution Approach 1:
The patent combines heat-assisted magnetic recording (HAMR) with current-assisted magnetic recording (CAMR) in a single write head structure. The laser heating element and current path are integrated into the same main pole assembly, allowing simultaneous thermal and magnetic field assistance to overcome the limitations of small main pole area while maintaining high recording density and reducing sector error rates
Solution Approach 2:
The patent introduces an intermediary current path that flows through the main pole to generate an assisting magnetic field. This current path acts as a mediator that enhances the magnetic field strength without requiring a larger main pole surface area, thereby improving signal strength and reducing sector errors while maintaining high recording density
2Quantity of substance
If the main pole surface area is decreased to achieve higher recording density, then the recording density increases, but the magnetic field strength becomes insufficient
Solution Approach 1:
The patent changes the operational parameters by introducing a current path that flows through the main pole, transforming the magnetic field generation mechanism. The current through the main pole creates an additional magnetic field component that supplements the coil-generated field, effectively increasing magnetic field strength without increasing main pole surface area
Solution Approach 2:
The patent merges two magnetic field generation mechanisms: the traditional coil-generated field and the new current-path-generated field. This combination of fields provides sufficient magnetic field strength for high-density recording while maintaining a small main pole surface area
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 recording density by reducing sector error rates and improving magnetic field effectiveness, allowing for more precise data writing with reduced errors.
Implementation Method 1
a laser source is located next to or near the write element in order to produce heat, such as a laser source exciting a near-field transducer (NFT) to produce heat at a write location of a magnetic recording medium
Implementation Method 2
A coil is around the main pole
Implementation Method 3
An electrical connection is between the main pole tip and the trailing shield. A current path is formed between the first terminal and the second terminal through the trailing shield, the electrical connection, and the main pole
Data Source
AI summary
The present disclosure relates to heat-assisted magnetic recording (HAMR) write heads including a waveguide and a main pole having a main pole tip. One or more current paths are provided through the main pole tip. Terminals of the one or more current paths can be coupled to the main pole, a trailing shield, a leading shield, a heat sink layer, a touch pad, a pole diffusion barrier layer, a NTS sensor, or another suitable component of the HAMR write head.