Dual purpose tape write transducer

Patent metadata

Field	Value
Publication number	US-9355656-B1
Application number	US-201514644534-A
Country	US
Kind code	B1
Filing date	Mar 11, 2015
Priority date	Mar 11, 2015
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

A tape write transducer includes a first yoke member, a second yoke member and a shield member arranged in a row so that row includes two gaps: an inter-yoke-member gap (between the two yoke members), and a shield-member gap (between one of the yoke members and the shield member). In operations using an underlayerless tape, the magnetic field in the inter-yoke member gap causes magnetic transitions to be written to the underlayerless recording medium in a point along the tape that is in vicinity to the inter-yoke-member gap. In operations using an underlayer tape, the magnetic field in the shield-member gap causes magnetic transitions to be written to the underlayer tape recording layer at a point along the tape that is in vicinity to the shield-member gap.

First claim

What is claimed is:

1. A write transducer for use with underlayer type magnetic tape storage mediums and underlayerless type magnetic tape mediums, the write transducer comprising:
a set of electric coil(s);
a first yoke member;
a second yoke member; and
a shield member;
wherein:
the first yoke member, the second yoke member and the shield member are made of magnetizable material(s);
the first yoke member, the second yoke member and the shield member are arranged in a row along a tape travel direction and are aligned to form a tape bearing surface;
the first yoke member and the second yoke member are sized, shaped and/or located to define an inter-yoke-member gap;
the second yoke member and the shield member are sized, shaped and/or located to define a shield-member gap;
the first yoke member and the second yoke member are sized, shaped and/or located so that current in the set of electric coil(s) will magnetize the first and second yoke members in opposite magnetic polar orientations; and
the first yoke member, the second yoke member and the shield member are sized, shaped and/or located so that, in operation: (i) magnetic transitions will be written to underlayerless type magnetic tape mediums in the vicinity of the inter-yoke-member gap but not the shield-gap, and (ii) magnetic transitions will be written to underlayer type magnetic tape mediums in the vicinity of the shield-gap.

2. The write transducer of claim 1 wherein:
the first yoke member, the second yoke member and the shield member further are sized, shaped and/or located so that, in operation, magnetic transitions are written in a non-parallel orientation.

3. The write transducer of claim 2 wherein:
the first yoke member, the second yoke member and the shield member further are sized, shaped and/or located so that, in operation, magnetic transitions are written in a perpendicular orientation.

4. The write transducer of claim 1 wherein:
the first yoke member, the second yoke member and the shield member further are sized, shaped and/or located so that the inter-yoke-member gap is larger than the shield member gap.

5. The write transducer of claim 1 further comprising:
a back magnetic yoke stud having a first end and a second end;
wherein:
the back magnetic yoke stud is made of magnetizable material;
the back magnetic yoke stud is located substantially along a central axis of the set of electric coil(s); and
the back magnetic yoke stud is: (i) mechanically connected to the first yoke member at its first end, and (ii) mechanically connected to the second yoke member at its first end.

6. The write transducer of claim 5 wherein:
the first yoke member includes a bottom yoke layer and a front yoke stud member; and
the second yoke member includes a write pole member including a write pole stitch layer and a high moment layer.

7. A write transducer for use with underlayer type magnetic tape storage mediums and underlayerless type magnetic tape mediums, the write transducer comprising:
a set of electric coil(s);
a first yoke member including a bottom yoke layer and a front yoke stud member;
a second yoke member including a write pole stitch layer and a high moment layer; and
a shield member;
wherein:
the first yoke member, the second yoke member and the shield member are made of magnetizable material(s);
the first yoke member, the second yoke member and the shield member are arranged in a row along a tape travel direction and are aligned to form a substantially co-planar tape bearing surface;
the front yoke stud member of the first yoke member and the write pole stitch layer of the second yoke member are sized, shaped and/or located to define an inter-yoke-member gap;
the high moment layer of the second yoke member and the shield member are sized, shaped and/or located to define a shield-member gap;
the first yoke member and the second yoke member are sized, shaped and/or located so that current in the set of electric coil(s) will magnetize the first and second yoke members in opposite magnetic polar orientations; and
the first yoke member, the second yoke member and the shield member are sized, shaped and/or located so that, in operation: (i) magnetic transitions will be written to underlayerless type magnetic tape mediums in the vicinity of the inter-yoke-member gap but not the shield-gap, and (ii) magnetic transitions will be written to underlayer type magnetic tape mediums in the vicinity of the shield-gap.

8. The write transducer of claim 7 further comprising:
an inter-yoke-member gap layer; and
a shield-member gap layer;
wherein:
the inter-yoke-member gap layer and the shield-member gap layer are both made of substantially non-magnetizable materials;
the inter-yoke-member gap layer is located in the inter-yoke-member gap between the write pole stitch layer and the front yoke stud member; and
the shield-member gap layer is located in the shield-member gap between the high moment layer and the shield member.

9. The write transducer of claim 7 wherein:
the write transducer is sized, shaped and/or configured to write at 20 gigabits per inch squared.

10. The write transducer of claim 7 wherein:
the shield member is made to include at least one of the following materials: (i) high moment Ni x Fe y , with x being greater than or equal to 45 and y being greater than or equal to 55; (ii) CoFe; and (iii) CoZr.

11. The write transducer of claim 7 wherein the second yoke member includes at least one of the following materials: (i) NiFe, (ii) NiFeCo, (iii) CoZr alloy, (iv) CoFe, (v) CoPt, (vi) Fe(N); (vii) a laminate of NiFe with at least one of the following Ta, SiN 3 , SiO 2 and Al 2 O 3 ; (viii) Fe(N) with at least one of the following: Ta, SiN 3 , SiO 2 and Al 2 O 3 ; (ix) a laminate of NiFeCo with at least one of the following: Ta, SiN 3 , SiO 2 and Al 2 O 3 ; (x) a laminate of CoZr with at least one of the following: Ta, SiN 3 , SiO 2 and Al 2 O 3 ; (xi) a laminate of CoFe with at least one of the following: Ta, SiN 3 , SiO 2 and Al 2 O 3 ; or (xii) a laminate of CoPt with at least one of the following: Ta, SiN 3 , SiO 2 and Al 2 O 3 .

12. The write transducer of claim 7 wherein:
the first yoke member, the second yoke member and the shield member further are sized, shaped and/or located so that, in operation, magnetic transitions are written in a perpendicular orientation.

13. The write transducer of claim 7 further comprising:
a back magnetic yoke stud having a first end and a second end;
wherein:
the back magnetic yoke stud is made of magnetizable material;
the back magnetic yoke stud is located substantially along a central axis of the set of electric coil(s); and
the back magnetic yoke stud is: (i) mechanically connected to the first yoke member at its first end, and (ii) mechanically connected to the second yoke member at its first end.

14. A method of fabricating a write transducer for use with underlayer type magnetic tape storage mediums and underlayerless type magnetic tape mediums, the write transducer, the method comprising:
providing a bottom yoke layer defining an up direction and a down direction;
forming a set of electric coils above the bottom yoke layer by one of the following processes: (i) deposition, or (ii) electroplating;
forming a front yoke stud member and a back yoke stud member above the bottom yoke layer by lithography and electroplating;
adding an inter-yoke-member gap layer that extends over a top surface of the front yoke stud member;
depositing a set of write pole layer(s) over at least a portion of a top surface of the inter-yoke-member gap layer and at least

Assignees

• IBM

Inventors

• Biskeborn Robert G
• Fontana Jr Robert E
• Jubert Pierre-Olivier

Classifications

• G11B5/21

  the pole pieces being of ferrous sheet metal {or other magnetic layers (G11B5/1871 takes precedence; in thin film G11B5/31)} · CPC title

• G11B5/1871

  Shaping or contouring of the transducing or guiding surface · CPC title

• G11B5/23 Primary

  Gap features {(G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence)} · CPC title

• G11B5/1278

  specially adapted for magnetisations perpendicular to the surface of the record carrier · CPC title

• G11B5/4984

  Structure of specially adapted switching heads (G11B5/3958 takes precedence) · CPC title