# US 10,121,498 B2 · Beaked write transducer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,121,498 B2 - Document ID: US10121498B2 - Status: Granted - Kind: B2 - Application number: 15/444,169 - Filed: 2017-02-27 - Published: 2018-08-30 - Granted: 2018-11-06 - Earliest claimed: 2017-02-27 - Assignees: International Business Machines Corporation - Applicants: International Business Machines Corporation - Inventors: Robert G. Biskeborn; Calvin S. Lo - Web page: https://patentgrep.com/patent/US10121498B2 ## CPC - G11B 5/3153: {including at least one magnetic thin film coupled by interfacing to the basic magnetic thin film structure} - G11B 5/00813: {magnetic tapes} - G11B 5/00826: {comprising a plurality of single poles or gaps or groups thereof operative at the same time} - G11B 5/147: 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)} - G11B 5/1871: {Shaping or contouring of the transducing or guiding surface} - G11B 5/23: Gap features {(G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence)} - G11B 5/265: 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}) - G11B 5/2652: {with more than one gap simultaneously operative (with controlled single gap G11B5/245)} - G11B 5/29: Structure or manufacture of unitary devices formed of plural heads for more than one track {(G11B5/33, G11B5/49 and subgroups take precedence; in thin film structure G11B5/31)} - G11B 5/3116: {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)} - G11B 5/3945: {Heads comprising more than one sensitive element} - G11B 5/3967: {Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read (G11B5/3906 takes precedence)} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 1) An apparatus as recited in claim 1, wherein, for the at least one write transducer, the write gap is electrically conductive. ### Claim 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. ### Claim 8 (depends on 7) 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. ### Claim 9 (depends on 7) 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. ### Claim 10 (depends on 7) 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. ### Claim 11 (depends on 7) 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. ### Claim 12 (depends on 11) 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. ### Claim 13 (depends on 7) 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. ### Claim 14 (depends on 7) 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. ### Claim 15 (depends on 7) 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. ### Claim 16 (depends on 7) An apparatus as recited in claim 7, wherein, for at least one of the write transducers, the write gap is electrically conductive. ### Claim 17 (depends on 7) 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. ### Claim 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. ### Claim 19 (depends on 18) An apparatus as recited in claim 18, wherein the second high moment layer has a trimmed portion extending toward the write gap.