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Merged magnetic head which includes a write head with single-sided notched first pole piece
| Details |
Inventors: Chang, Thomas Young; Lee, Edward Hinpong; Lo, Jyh-Shuey Jerry;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Klimowicz; William
Assistant Examiner:
Attorney, Agent or Firm: Johnston; Ervin F.
A single-sided, notched write head is provided for writing narrow erase band servo tracks as well as a double-notched write head, and for writing data tracks better than a double-notched write head. The single-sided, notched write head writes a narrow erase band on the notched side and a wide erase band on the unnotched side. In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment a first side of the first pole piece layer is notched more than a second side. By writing servo tracks only a fraction of the track width of the write head, a wide erase band region is overwritten so that a narrow erase band is on each side of the servo track. Data tracks are written with a narrow erase band on one side and a wide erase band on the other side. The wide erase band on one side of the data track allows more flexibility in spacing the read head from adjacent tracks. The single-sided, notched write head can be manufactured with methods that require less processing time than a double-notched write head. In one method, a notching layer is employed where removal of a small corner of the notching layer provides the first pole piece with a notch. Other methods employ photoresist to protect the side of the first pole piece that is not to be notched, and/or oscillating the workpiece less than 360.degree.. so that milling is more concentrated at the notch site. |
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DETAILED DESCRIPTION We have discovered that a single-sided, notched write head writes narrow erase band servo tracks equally well as a double-notched write head since the servo pattern is written with only one side of the write head.
This produces a superior servo pattern compared to the conventional merge write head.
For data performance, this implies that the single sided notch head is not as good as the merged head for mitigating side interference, but is better than the dual-sided notched write head.
The single-sided notched write head will write a narrow erase band on the notched side and a wide erase band on the side that is not notched.
In one embodiment, only one side of the first pole piece layer is notched, and in another embodiment, a first side of the first pole piece layer is notched more than a second side thereof.
In operation, the single-sided, notched write head is moved a distance less than the track width of the write head for each servo track written on the disk.
For instance, if the write head is moved over one-half a track width for each servo track, servo tracks can be written with a narrow erase band on each side of each servo track.
Accordingly, the single-sided, notched write head can write servo tracks equally well as a double-sided, notched write head.
Data tracks will be written with a narrow erase band on one side and a wide erase band on the other side.
This is a better configuration for read head performance than one with a narrow erase band on both sides of the data track.
The wide erase band on one side of the data track allows greater flexibility in spacing the read head from adjacent tracks.
The construction of a single-sided, notched write head requires less time to construct than a double-sided, notched write head.
We have provided several methods of construction.
Generally, the windage of the second pole tip can be reduced by 2.
In one method, the second pole tip is frame-plated on the gap layer, and photoresist is employed for protecting a side of the first pole piece layer that is not to be notched
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Metal Working 
