Magnetic recording transducer with short effective throat height and method of fabrication
View Patent ↗A magnetic recording transducer for use in a data storage device includes a writer pole with a ABS surface, trailing edge bevel and a trailing shield. The effective throat height of the writer main pole is reduced by the use two gap layers between the writer main pole and the trailing shield. A first gap layer is on and in contact with the writer pole trailing surface, and a second gap layer is on a section of the first gap layer on the writer pole trailing edge bevel, from a point removed from the ABS surface and absent from a part on a section of the first gap layer on the writer pole trailing edge bevel nearest the ABS. A method of fabricating the transducer is also provided.
1. A magnetic recording transducer for use in a data storage device, comprising:
a writer pole with a trailing side and a leading side opposite the trailing side, the trailing side comprising:
a non-beveled surface beginning at a first vertex, the non-beveled surface extending in a direction away from an Air Bearing Surface (ABS);
a first trailing side beveled section beginning at the first vertex and extending from the first vertex in a direction toward the ABS;
the first trailing side beveled section beveled at a first bevel angle (α) from a direction perpendicular to the ABS;
the leading side comprising a leading side beveled section;
a first gap layer on and in contact with the non-beveled surface and the first trailing side beveled section;
a second gap layer on a first section of the first gap layer and absent from a second section of the first gap layer, wherein the second section of the first gap layer on the first trailing side beveled section is nearer to the ABS than the first section,
wherein the second gap layer has a thickness forming an edge, the edge forming a second bevel angle (β) from the direction perpendicular to the ABS, and β is less than 90 degrees;
a write coil;
a coil insulator on the second gap layer, wherein a portion of the write coil is embedded in the coil insulator; and
a trailing shield on at least a portion of the first gap layer and on at least a portion of the second gap layer, wherein the portion of the second gap layer comprises a surface that is substantially perpendicular to the ABS.
2. The magnetic recording transducer in claim 1 , wherein the trailing shield is on at least a portion of the non-beveled surface.
3. The magnetic recording transducer in claim 1 , wherein α is between 0 and 45 degrees.
4. The magnetic recording transducer of claim 1 , wherein an effective throat height of the magnetic recording transducer is about equal to a distance between the edge of the second gap layer and the ABS.
5. The magnetic recording transducer in claim 1 , wherein β is greater than 30.
6. The magnetic recording transducer in claim 1 , wherein α is less than β.
7. The magnetic recording transducer in claim 1 , wherein the distance from the ABS to the second gap layer is 20-150 nm.
8. The magnetic recording transducer in claim 1 , wherein the thickness of the trailing shield is 150-500 nm.
9. The magnetic recording transducer in claim 1 , wherein the thickness of the first gap layer is 15-50 nm.
10. The magnetic recording transducer in claim 1 , wherein the thickness of the second gap layer is 15-200 nm.
11. The magnetic recording transducer of claim 1 , wherein the first gap layer comprises non-magnetic material.
12. The magnetic recording transducer in claim 1 , wherein the first gap layer and second gap layer comprise Al2O3, SiO2, NiCr, NiNb, Ru, Cr, or Ta.
13. The magnetic recording transducer in claim 12 , wherein the first gap layer and second gap layer comprise different materials that can be selectively etched.
14. A disk drive comprising:
a slider including a magnetic recording transducer, the magnetic recording transducer including:
a writer pole with a trailing side and a leading side opposite the trailing side, the trailing side comprising:
a non-beveled surface beginning at a first vertex, the non-beveled surface extending in a direction away from an Air Bearing Surface (ABS);
a first trailing side beveled section beginning at the first vertex and extending from the first vertex in a direction toward the ABS;
the first trailing side beveled section beveled at a first bevel angle (a) from a direction perpendicular to the ABS;
the leading side comprising a leading side beveled section;
a first gap layer on and in contact with the non-beveled surface and the first trailing side beveled section;
a second gap layer on a first section of the first gap layer and absent from a second section of the first gap layer, wherein the second gap layer has a thickness forming an edge, the edge forming a second bevel angle (β) from the direction perpendicular to the ABS, and β is less than 90 degrees, wherein:
the second section of the first gap layer on the first trailing side beveled section is nearest the ABS;
a write coil;
a coil insulator on the second gap layer, wherein a portion of the write coil is embedded in the coil insulator; and
a trailing shield on at least a portion of the first gap layer and on at least a portion of the second gap layer, wherein the portion of the second gap layer comprises a surface that is substantially perpendicular to the ABS.