Magnetic recording write apparatus having a pole having an aspect ratio greater than one and an auxiliary pole
A magnetic write apparatus has a media-facing surface (MFS) and includes an auxiliary pole, coil(s) and a main pole having a pole tip and a yoke. The pole tip occupies part of the MFS. The yoke has a yoke length measured from the MFS in a yoke direction perpendicular to the MFS. The yoke length is less than four microns. The main pole has a total length in the yoke direction and a width in a cross-track direction. The main pole is continuous along the total length. The aspect ratio of the main pole is the total length divided by the width and exceeds one. The main pole includes surface(s) having a nonzero acute flare angle from the MFS. The auxiliary pole is adjacent to the main pole and recessed from the MFS by not more than 1.05 micron. The coil(s) energizes the main pole and have not more than two turns.
1. A magnetic write apparatus comprising:
a main pole comprising:
a pole tip occupying a portion of a media facing surface;
a yoke recessed from the media facing surface and extending from the pole tip in a yoke direction that is perpendicular to the media facing surface; and
a yoke extension region extending in the yoke direction from the yoke,
wherein the main pole has a total length in the yoke direction, the total length extending from the media facing surface to a back surface of the yoke extension region, the back surface being the surface of the yoke extension region that is farthest away from the media facing surface in the yoke direction;
wherein the main pole is substantially rectangular in shape with rounded corners in the cross track direction, wherein the rounded corners have a radius of curvature that is at least 2 microns and not more than 4 microns;
wherein the main pole has a main pole width in a cross track direction that is perpendicular to the yoke direction and to the media facing surface; and
wherein the main pole has an aspect ratio obtained by dividing the total length by the main pole width, and wherein the aspect ratio is greater than 1.
2. The magnetic write apparatus of claim 1 , wherein the aspect ratio is at least 1.2 and not more than 2.
3. The magnetic write apparatus of claim 1 , wherein the pole tip comprises sidewalls extending in the cross track direction, wherein the sidewalls are oriented at a flare angle to a direction parallel to the media facing surface, and wherein the flare angle occurs at a flare point that is recessed from the media facing surface by a flare distance.
4. The magnetic write apparatus of claim 3 , wherein the flare angle is at least 30 degrees and not more than 70 degrees.
5. The magnetic write apparatus of claim 3 , wherein the flare distance is at least 0.1 micron and not more than 0.45 microns.
6. The magnetic write apparatus of claim 1 , wherein the yoke has a yoke length extending from the media facing surface to a front surface of the yoke extension region, the front surface of yoke extension region being closer to the media facing surface than the back surface of the yoke extension region, and wherein the yoke length is less than 4 microns.
7. The magnetic write apparatus of claim 1 , further comprising a trailing shield above the main pole in a down track direction that extends parallel to the media facing surface, wherein a portion of the trailing shield and a portion of the main pole are separated by a back gap.
8. The magnetic write apparatus of claim 1 , further comprising a leading shield below the main pole in a down track direction that extends parallel to the media facing surface, wherein a write gap separates the leading shield from the main pole.
9. A magnetic write apparatus comprising:
a main pole comprising:
a pole tip occupying a portion of a media facing surface;
a yoke recessed from the media facing surface and extending from the pole tip in a yoke direction that is perpendicular to the media facing surface;
a yoke extension region extending in the yoke direction from the yoke,
wherein the main pole has a total length in the yoke direction, the total length extending from the media facing surface to a back surface of the yoke extension region, the back surface being the surface of the yoke extension region that is farthest away from the media facing surface in the yoke direction; and
an auxiliary pole adjacent to the main pole, wherein the auxiliary pole is recessed from the media facing surface by not more than 1.05 microns,
wherein the main pole has a main pole width in a cross track direction that is perpendicular to the yoke direction and to the media facing surface; and
wherein the main pole has an aspect ratio obtained by dividing the total length by the main pole width, and wherein the aspect ratio is greater than 1.
10. The magnetic write apparatus of claim 9 , wherein the auxiliary pole has a thickness in a down track direction that extends parallel to the media facing surface, wherein the thickness is at least 0.2 microns and not more than 0.5 microns.
11. The magnetic write apparatus of claim 9 , wherein the auxiliary pole comprises a front surface and a back surface in the yoke direction, the front surface being closer to the media facing surface than the back surface, and wherein the front surface forms a first angle with a down track direction that extends parallel to the media facing surface, the first angle being at least 15 degrees and not more than 50 degrees.
12. The magnetic write apparatus of claim 11 , wherein the back surface forms a second angle with the down track direction, wherein the second angle is at least 15 degrees and not more than 50 degrees.
13. A magnetic write apparatus comprising:
a main pole comprising:
a pole tip occupying a portion of a media facing surface;
a yoke recessed from the media facing surface and extending from the pole tip in a yoke direction that is perpendicular to the media facing surface; and
a yoke extension region extending in the yoke direction from the yoke; and
a first auxiliary pole below the main pole in a down track direction that extends parallel to the media facing surface, the first auxiliary pole having a front surface and a back surface,
wherein the front surface is closer to the media facing surface than the back surface, and wherein the front surface is recessed from the media facing surface,
wherein a length of the first auxiliary pole in the yoke direction is smaller than a total length of the main pole in the yoke direction, and
wherein a width of the first auxiliary pole in a cross track direction that is perpendicular to the yoke direction and the down track direction is smaller than a width of the main pole in the cross track direction.
14. The magnetic write apparatus of claim 13 , further comprising a second auxiliary pole above the main pole in the down track direction, the second auxiliary pole having a front surface and a back surface, wherein the front surface of the second auxiliary pole is recessed from the media facing surface.
15. The magnetic write apparatus of claim 13 , wherein the first auxiliary pole has a thickness in the down track direction, and wherein the thickness is at least 0.2 microns and not more than 0.5 microns.
16. The magnetic write apparatus of claim 13 , wherein a shape of the main pole substantially matches a shape of the first auxiliary pole.