Method for manufacturing a patterned magnetic media with offset data and servo regions
A method for manufacturing a patterned magnetic media. The method allows both a data region and a servo region to be patterned without the patterning of one region adversely affecting the patterning of the other region. The method results in a patterned data region a patterned servo region and intermediate regions between the servo and data regions. The intermediate regions, which are most likely, but not necessarily, asymmetrical with one another indicate that the method has been used to pattern the media.
1. A method for manufacturing a magnetic media for magnetic data recording, comprising:
providing a wafer, the wafer having a first region and a second region;
depositing a first layer of hard mask material;
patterning the first layer of hard mask with a first pattern;
forming a first protective mask, the first protective mask covering at least a portion of the second region and leaving at least a portion of the first region uncovered;
performing a first material removal process to remove portions of the wafer that are not protected by the patterned first layer of hard mask material or the first protective mask to from a recessed pattern in the first region;
removing the first protective mask and the first layer of hard mask material;
depositing a second layer of hard mask material;
forming a second protective mask, the second protective mask covering at least a portion of the first region and leaving at least a portion of the second region uncovered;
patterning the second layer of hard mask with a second pattern; and
performing a second material removal process to remove a portion of the wafer that is not protected by the patterned second layer of hard mask material or the second protective mask to form a recessed pattern in the second region; wherein the first region and second region are either a servo region and a data region or a data region and a servo region.
2. The method as in claim 1 wherein the first region is a data region and the second region is a servo region.
3. The method as in claim 1 wherein the first region is a servo region and the second region is a data region.
4. The method as in claim 1 wherein the first and second material removal processes each comprise reactive ion etching.
5. The method as in claim 1 wherein the patterning of the second layer of hard mask material is performed after forming the second protective mask.
6. The method as in claim 1 wherein the patterning of the second layer of hard mask material is performed before forming the second protective mask.
7. The method as in claim 1 wherein the patterning of the first layer of hard mask material further comprises forming a first photoresist mask comprising concentric rings performing a first reactive ion etching to transfer the pattern of the first photoresist mask onto the first layer of hardmask material, and forming a second photoresist mask comprising radially extending segments and performing a second reactive ion etching to transfer the image of the second photoresist mask onto the first layer of hard mask material.
8. The method as in claim 1 wherein the first and second protective masks each comprise photoresist.
9. The method as in claim 1 wherein the patterning of the second layer of hard mask material further comprises forming a photoresist mask and performing a reactive ion etching to transfer the image of the photoresist mask onto the second layer of hard mask material.
10. The method as in claim 1 wherein the patterning of the first layer of hard mask material comprises patterning a negative image of a bit patterned servo region and the patterning of the second layer of hard mask material comprises patterning a negative image of a bit patterned data region.
11. The method as in claim 1 wherein the patterning of the first layer of hard mask material comprises patterning a negative image of a bit patterned servo region and the patterning of the second layer of hard mask material comprises patterning a negative image of a track patterned data region.