EAMR Write Pole Apertures for Laser Energy Routing
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Solution Overview
Problem
Conventional energy-assisted magnetic recording (EAMR) transducers suffer from inefficient energy delivery due to light being blocked by the write pole, leading to reduced heating of the media and potential overheating of the pole, which affects performance.
Innovation Solution
The EAMR transducer design includes a waveguide that directs energy from a laser through apertures in the back pedestal of the write pole, allowing unobstructed energy delivery to the media while minimizing heating of the pole, using a configuration that includes a write pole tip, yoke, and back pedestal with strategically placed apertures to facilitate energy passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If light is directed through the write pole to heat the media, then media heating is achieved, but the write pole is blocked and overheated
Solution Approach 1:
The back pedestal is segmented with multiple apertures (e.g., first aperture, second aperture, third aperture) that divide the light path into separate channels. This segmentation allows light to pass through the pole structure without concentrating all energy at a single point, thereby heating the media while distributing thermal load away from the pole itself.
Solution Approach 2:
The apertures in the back pedestal serve as intermediaries that redirect light energy around the write pole. Instead of light directly passing through the pole tip (which causes overheating), the apertures act as mediators that channel light through alternative paths, allowing energy delivery to the media while protecting the pole from direct thermal exposure.
2Reliability
If the write pole is made larger to improve magnetic performance, then writing capability is enhanced, but light blocking increases and energy delivery efficiency decreases
Solution Approach 1:
The back pedestal incorporates apertures with specific local qualities (size, shape, position) that are optimized for both magnetic performance and optical transmission. The apertures are positioned and dimensioned to allow sufficient light passage while maintaining the magnetic integrity of the write pole structure, creating a localized solution that addresses both requirements simultaneously.
3Use of energy by moving object
If conventional waveguide structures are used, then light delivery is achieved, but energy is blocked and lost
Solution Approach 1:
The aperture structure in the back pedestal introduces a new dimensional solution to the energy blocking problem. Instead of modifying the traditional waveguide path in the conventional plane, the apertures create a three-dimensional light routing solution that allows energy to pass through the pole structure by utilizing vertical and lateral spatial dimensions, thereby eliminating energy loss while maintaining delivery efficiency.
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 optical efficiency and reduces pole heating, resulting in improved performance by ensuring that energy is effectively used for media heating without compromising magnetic performance.
Implementation Method 1
The waveguide, which is shown as a planar solid immersion mirror, directs light from the gratings 32A and 32B to the spot 16
Implementation Method 2
The back pedestal has at least one aperture therein. The aperture(s) are configured to allow the energy from the laser to pass therethrough
Implementation Method 3
A small region of the conventional media is heated by the spot 16
Data Source
AI summary
A method and system for providing an energy assisted magnetic recording (EAMR) transducer coupled with a laser are described. The EAMR transducer has an air-bearing surface (ABS) configured to reside in proximity to a media during use. The method and system include providing at least one waveguide, at least one write pole, and at least one coil. The waveguide(s) are for directing the energy from the laser toward the ABS. The write pole(s) each include a write pole tip, a yoke, a back pedestal and a return pole. The write pole tip is coupled to the back pedestal through the yoke. The back pedestal has at least one aperture therein. The aperture(s) are configured to allow the energy from the laser to pass therethrough. The coil(s) are for energizing the at least one write pole.