Beaked write transducer

Patent metadata

Field	Value
Publication number	US-10121498-B2
Application number	US-201715444169-A
Country	US
Kind code	B2
Filing date	Feb 27, 2017
Priority date	Feb 27, 2017
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

An apparatus, according to one embodiment, includes: an array of write transducers, each write transducer having: a first write pole having a pole tip extending from a media facing side of the first write pole, a second write pole having a pole tip extending from a media facing side of the second write pole, a nonmagnetic write gap between the pole tips of the write poles, and a high moment layer between the write gap and the pole tip of the second write pole. The high moment layer has a higher magnetic moment than a magnetic moment of the pole tip of the second write pole. Moreover, the high moment layer protrudes beyond a plane extending along a media facing side of the second pole tip. Other systems, methods, and computer program products are described in additional embodiments.

First claim

What is claimed is:

1. An apparatus, comprising:
at least one write transducer having:
a first write pole having a pole tip extending from a media facing side of the first write pole, wherein the pole tip of the first write pole is configured to emanate magnetic flux directly from the media facing side toward a magnetic medium;
a second write pole having a pole tip extending from a media facing side of the second write pole;
a nonmagnetic write gap between the pole tips of the write poles;
a first high moment layer between the write gap and the pole tip of the second write pole, the first high moment layer having a higher magnetic moment than a magnetic moment of the pole tip of the second write pole;
wherein the first high moment layer protrudes beyond a plane extending along a media facing side of the second pole tip; and
a second high moment layer between the write gap and the pole tip of the first write pole, the second high moment layer having a higher magnetic moment than a magnetic moment of the pole tip of the first write pole,
wherein the second high moment layer protrudes beyond a plane extending along a media facing side of the first pole tip.

2. An apparatus as recited in claim 1 , wherein the second high moment layer extends along the pole tip of the first write pole in a cross track direction for a distance about equal to a width of the pole tip of the second write pole measured in the same direction.

3. An apparatus as recited in claim 1 , wherein, for the at least one write transducer, the pole tip of the first pole has a pedestal extending toward the write gap, wherein a width of a trimmed portion of the pedestal extends in a cross track direction for a distance about equal to a width of the pole tip of the second write pole measured in the same direction.

4. An apparatus as recited in claim 1 , wherein the second write pole is comprised of a yoke portion and the pole tip, wherein the first high moment layer does not extend along the yoke portion.

5. An apparatus as recited in claim 1 , further comprising:
a drive mechanism for passing a magnetic medium over the write transducer; and
a controller electrically coupled to the write transducer.

6. An apparatus as recited in claim 1 , wherein, for the at least one write transducer, the write gap is electrically conductive.

7. An apparatus, comprising:
an array of write transducers, each write transducer having:
a first write pole having a pole tip extending from a media facing side of the first write pole, wherein the pole tip of the first write pole is configured to emanate magnetic flux directly from the media facing side toward a magnetic medium;
a second write pole having a pole tip extending from a media facing side of the second write pole;
a nonmagnetic write gap between the pole tips of the write poles;
a first high moment layer between the write gap and the pole tip of the second write pole; and
a second high moment layer between the write gap and the pole tip of the first write pole,
the first high moment layer having a higher magnetic moment than a magnetic moment of the pole tip of the second write pole,
the second high moment layer having a higher magnetic moment than a magnetic moment of the pole tip of the first write pole,
wherein the first high moment layer protrudes beyond a plane extending along a media facing side of the second pole tip,
wherein the second high moment layer protrudes beyond a plane extending along a media facing side of the first pole tip.

8. An apparatus as recited in claim 7 , wherein, for at least one of the write transducers, the first high moment layer is an alloy of iron and a material, the material being selected from a group consisting of: cobalt, nickel, aluminum, platinum.

9. An apparatus as recited in claim 7 , wherein the second write pole is comprised of a yoke portion and the pole tip, wherein the first high moment layer does not extend along the yoke portion.

10. An apparatus as recited in claim 7 , wherein, for at least one of the write transducers, a deposition thickness of the first high moment layer is in a range of about 50 nm to about 400 nm.

11. An apparatus as recited in claim 7 , wherein, for at least one of the write transducers, the pole tip of the first pole has a pedestal extending toward the write gap, wherein a width of a trimmed portion of the pedestal extends in a cross track direction for a distance about equal to a width of the pole tip of the second write pole measured in the same direction.

12. An apparatus as recited in claim 11 , wherein the second high moment layer is between the write gap and the pedestal of the pole tip of the first write pole.

13. An apparatus as recited in claim 7 , wherein the second high moment layer extends along the pole tip of the first write pole in a cross track direction for a distance about equal to a width of the pole tip of the second write pole measured in the same direction.

14. An apparatus as recited in claim 7 , wherein, for each of the write transducers, the first write pole is a lower write pole, wherein the second write pole is formed above the first write pole along a deposition direction of the respective write transducer.

15. An apparatus as recited in claim 7 , wherein, for each of the write transducers, the second write pole is a lower write pole, wherein the first write pole is formed above the second write pole along a deposition direction of the respective write transducer.

16. An apparatus as recited in claim 7 , wherein, for at least one of the write transducers, the write gap is electrically conductive.

17. An apparatus as recited in claim 7 , further comprising:
a drive mechanism for passing a magnetic medium over the write transducers; and
a controller electrically coupled to the write transducers.

18. An apparatus, comprising:
an array of write transducers, each write transducer having:
a first write pole having a pole tip extending from a media facing side of the first write pole;
a second write pole having a pole tip extending from a media facing side of the second write pole;
a nonmagnetic write gap between the pole tips of the write poles;
a first high moment layer between the write gap and the pole tip of the second write pole; and
a second high moment layer between the write gap and the pole tip of the first write pole,
the first high moment layer having a higher magnetic moment than a magnetic moment of the pole tip of the second write pole,
the second high moment layer having a higher magnetic moment than a magnetic moment of the pole tip of the first write pole,
wherein the first high moment layer protrudes beyond a plane extending along a media facing side of the second pole tip,
wherein the second high moment layer protrudes beyond a plane extending along a media facing side of the first pole tip,
wherein the second high moment layer extends along the pole tip of the first write pole in a cross track direction for a distance greater than a width of the pole tip of the second write pole measured in the same direction.

19. An apparatus as recited in claim 18 , wherein the second high moment layer has a trimmed portion extending toward the write gap.

Assignees

• IBM

Inventors

• Biskeborn Robert G
• Lo Calvin S

Classifications

• G11B5/3945

  Heads comprising more than one sensitive element · CPC title

• G11B5/147

  with cores being composed of metal sheets, i.e. laminated cores {with cores composed of isolated magnetic layers, e.g. sheets (in thin films G11B5/31)} · CPC title

• G11B5/3116

  Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks (G11B5/3113, G11B5/245 take precedence) · CPC title

• G11B5/00813

  magnetic tapes · CPC title

• G11B5/265

  Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track (G11B5/33 takes precedence {in thin film structures G11B5/31}) · CPC title