Slider Body Dynamic Performance Testing for TAMR Heads
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Solution Overview
Problem
Conventional dynamic performance testing of thermally-assisted magnetic heads requires precise optical alignment and attachment of a light source unit, leading to low testing efficiency and increased material and labor costs due to the need for precise alignment and potential wastage of resources.
Innovation Solution
A method and system for testing dynamic performances of slider bodies without attaching a light source unit, using a flat top beam or Gaussian beam aligned with an optical waveguide to test the slider body before bonding, allowing for rough alignment and reducing costs by identifying defective sliders early.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precise optical alignment is performed to test the TAMR head at TAMR-level, then the measurement precision is improved, but the productivity deteriorates due to low testing efficiency
Solution Approach 1:
The testing process is segmented into two distinct levels: slider-level testing (using a light source with large light spot) and TAMR-level testing (using precise optical alignment). This segmentation allows defective sliders to be identified early at the slider level, avoiding the time-consuming precise alignment process for defective units, thereby resolving the contradiction between measurement precision and productivity.
Solution Approach 2:
The invention performs preliminary testing at the slider level before committing to the resource-intensive TAMR-level testing. By conducting an initial screening with a light source that has a large light spot and does not require precise alignment, defective sliders are identified and eliminated early, preventing waste of time and resources on subsequent precise alignment procedures for defective units.
2Reliability
If a light source unit is attached to the slider body for testing, then the reliability of the test is improved, but the loss of substance increases due to wastage of materials
Solution Approach 1:
The testing process is divided into two stages: slider-level testing using a separate light source (without attaching light source unit) and TAMR-level testing with attached light source unit. This segmentation ensures that the light source unit is only attached to sliders that have passed the initial screening, preventing material wastage by avoiding attachment to defective sliders.
Solution Approach 2:
The invention performs preliminary screening at the slider level using a light source that does not require attachment to the slider body. This preliminary action identifies defective sliders before the light source unit is attached, thereby preventing material wastage by ensuring that the light source unit is only attached to functional sliders that will proceed to full testing.
3Measurement precision
If precise optical alignment is performed, then the measurement precision is improved, but the loss of time increases due to alignment time
Solution Approach 1:
The testing workflow is segmented into slider-level testing (no alignment required) and TAMR-level testing (precise alignment required). This segmentation ensures that time-consuming alignment procedures are only performed on sliders that have already been screened as functional, minimizing the total time lost to alignment operations while maintaining measurement precision for valid test subjects.
Solution Approach 2:
The invention performs preliminary screening at the slider level using a light source with a large light spot that does not require precise alignment. This preliminary action quickly identifies and eliminates defective sliders before the time-consuming precise alignment process, thereby significantly reducing the total alignment time while preserving measurement precision for the remaining functional sliders.
4Reliability
If the light source unit is attached to the slider body, then the reliability of testing is improved, but the ease of manufacture deteriorates due to increased manufacturing complexity
Solution Approach 1:
The manufacturing and testing process is segmented into two phases: slider-level testing using a standalone light source (simpler process) and TAMR-level testing with attached light source unit (more complex but necessary for final validation). This segmentation simplifies the overall manufacturing process by enabling early screening without complex attachment procedures, while still ensuring reliable testing through subsequent TAMR-level validation.
Solution Approach 2:
The invention performs preliminary testing at the slider level using a light source that does not require attachment to the slider body, thereby simplifying the manufacturing process at this stage. This preliminary action reduces manufacturing complexity by avoiding unnecessary attachment operations for defective sliders, while maintaining testing reliability through subsequent TAMR-level testing on qualified sliders.
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 approach reduces material and labor costs by enabling efficient dynamic performance testing at the slider level, allowing for the identification and discard of defective sliders before bonding, thus optimizing resource utilization and improving testing efficiency.
Implementation Method 1
an optical waveguide 354 formed adjacent to the magnetic pole 344 for guiding light generated by the light source unit 130
Implementation Method 2
The light source unit 130 includes a laser diode 131 located near the write element and a mounting base 132 for supporting the laser diode 131. The laser diode 131 emits a laser light to a portion of the magnetic recording medium, which reduces the medium's coercivity.
Implementation Method 3
a technology so-called thermal assisted magnetic recording (TAMR) has been proposed... When writing data, a write magnetic field and heat are applied almost simultaneously to the area of the magnetic recording medium where to write data, so that the area rises in temperature and drops in coercivity for data writing.
Data Source
AI summary
A method of testing dynamic performances for a slider body of a thermally-assisted magnetic head includes: providing a slider body which is disconnected with a light source unit; removably mounting the slider body to a test head suspension assembly; keeping to provide a flat top beam to the slider body, the flat top beam being aligned with the optical waveguide, and a projection of an incident end of the optical waveguide being located within a light spot of the flat top beam; and testing the dynamic performance of the slider body. It can save the material cost and labor cost, and eliminate a precise optical alignment between an input light and an optical waveguide in the slider body to improve testing efficiency.