Method of producing a head core slider

A method of producing a core slider for a rigid magnetic disk drive, comprising the steps of:

• forming a groove in at least one of abutting surfaces of a first and a second ferrite block;
• butting and bonding together said first and second ferrite blocks at said abutting surfaces, to form an integral ferrite bar which has a closed magnetic path defined between said first and second blocks, said ferrite bar having a magnetic gap corresponding to a depth of said groove;
• applying an etching mask to a surface of said ferrite bar in which said magnetic gap is open, and etching said surface of the ferrite bar to form a plurality of spaced-apart air bearing portions on said first ferrite block, and a plurality of track portions which extend from said air bearing portions, respectively, and between said first and second ferrite blocks, said air bearing portions and said track portions having a predetermined height, one of each pair of two adjacent track portions of said plurality of track portions having a larger width in a transverse direction perpendicular to a direction of extension of said air bearing portions, than the other of said each pair of two adjacent track portions;
• and
• cutting said ferrite bar to prepare at least one core slider, each of which includes a slider body having the two adjacent air bearing portions corresponding to said two adjacent track portions, and a pair of yoke portions which are formed on said second ferrite block and which cooperate with said slider body to form said two adjacent track portions.

A method of producing a core slider for a rigid magnetic disk drive, comprising the steps of:

• forming a primary groove in at least one of abutting surfaces of a first and a second ferrite block, by etching said at least one abutting surface through a first etching mask applied thereto;
• forming a plurality of secondary recesses in at least one of said abutting surfaces of the first and second ferrite blocks, by etching said at least one abutting surface through a second etching mask applied thereto;
• butting and bonding together said first and second ferrite blocks at said abutting surfaces, to form an integral ferrite bar which has a closed magnetic path defined between said first and second blocks, said ferrite bar having a first magnetic gap corresponding to a total depth of said primary groove, and a second magnetic gap corresponding to a total depth of said primary groove and said secondary recesses;
• applying a third etching mask to a surface of said ferrite bar in which said first and second magnetic gaps are open, and etching said surface of the ferrite bar to form a plurality of spaced-apart air bearing portions on said first ferrite block, and a plurality of track portions which extend from said air bearing portions, respectively, and between said first and second ferrite blocks, said air bearing portions and said track portions having a predetermined height, said first magnetic gap being open in one of each pair of two adjacent track portions of said plurality of track portions, while said second magnetic gap being open in the other of said each pair of two adjacent track portions, said other of said each pair of two adjacent track portions having a larger width in a transverse direction perpendicular to a direction of extension of said air bearing portions, than said one of said each pair of two adjacent track portions;
• and
• cutting said ferrite bar to prepare at least one core slider, each of which includes a slider body having the two adjacent air bearing portions corresponding to said two adjacent track portions, and a pair of yoke portions which are formed on said second ferrite block and which cooperate with said slider body to form said two adjacent track portions.