Customized head gimbal assembly bonding skew angle for adjusting two-dimensional magnetic recording reader alignment
View Patent ↗System and methods are illustrated for customizing the HGA bonding skew angle of a TDMR slider including a plurality of readers to adjust reader alignment relative to a track location on disk media. Overlay error caused by manufacturing variations is compensated for by adjusting the skew angle of the slider when it is bonded to the suspension to form the HGA. Process operations for manufacturing a TMDR HDD include manufacturing a multiple reader, multiple layer TDMR slider, determining an overlay error in the slider, determining a slider bonding skew angle based on the determined overlay error and other parameters, and bonding the slider to a HDD suspension at the determined bonding skew angle.
1. A method of correcting overlay error (OLE) in a slider comprising a plurality of readers, comprising:
determining a first OLE between a first reader and a second reader of the slider;
determining a bonding skew angle of the slider prior to bonding it to a suspension; and
bonding the slider to the suspension at the determined bonding skew angle.
2. The method of claim 1 , wherein the first OLE is determined based on a Scanning Electron Microscope (SEM) image of the plurality of readers at an air bearing surface (ABS).
3. The method of claim 2 , wherein the bonding skew angle of the slider is based on the first OLE.
4. The method of claim 1 , wherein the bonding skew angle is zero.
5. The method of claim 4 , wherein the slider is bonded to the suspension using a skew bin.
6. The method of claim 5 , wherein the first reader is on a first layer of the slider, and wherein the second reader is on a second layer of the slider.
7. The method of claim 6 , wherein the bonding skew angle is further based on the longitudinal separation between the first layer and the second layer.
8. The method of claim 7 , further comprising manufacturing the slider prior to determining the first OLE.
9. The method of claim 8 , wherein the slider is a two-dimensional magnetic recording (TDMR) slider.
10. The method of claim 8 , wherein the bonding skew angle is further based on a second OLE between the second reader and a third reader.
11. The method of claim 10 , wherein the third reader is on the first layer.
12. The method of claim 10 , wherein the third reader is on a third layer.
13. The method of claim 7 , wherein the bonding skew angle is further based on the width of each of the plurality of readers.