Thin magnetic film including multiple geometry gap structures on a common substrate

• US 5,909,346 A
• Filed: 06/25/1997
• Issued: 06/01/1999
• Est. Priority Date: 08/26/1994
• Status: Expired due to Fees

• Current Assignee: Aiwa (Sony Group Corp.)
• Original Assignee: Aiwa Research And Development, Inc.
• Inventors: Malhotra, Arun, Gray, G. Robert
• Primary Examiner(s): Miller, Brian E.
• Application Number:
  US08/882,370
• Time in Patent Office: 706 Days
• Field of Search: 360/121, 360/122, 360/126, 360/119
• US Class Current: 360/125.35
• CPC Class Codes: G11B 5/31 using thin films G11B5/1274, G11B5/1278, G11B5/1874, G11B5/1875, G11B5/33, G11B5/49 take precedence; magnetic thin film structures H01F10/00
• CPC Class Codes: 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
• CPC Class Codes: G11B 5/3183 intersecting the gap plane, e.g. "horizontal head structure"
• CPC Class Codes: G11B 5/488 Disposition of heads G11B5/49, G11B5/52 take precedence

Abstract

A thin film magnetic head assembly is provided which includes a plurality of thin film heads situated atop a common substrate. An insulative main body is built up layer by layer on the substrate. A plurality of magnetic yokes exhibiting different geometries are situated on the substrate and within the main body. The magnetic yokes are built up layer by layer at the same time that the insulative main body is fabricated. A plurality of coil structures are situated within the main body and are magnetically coupled to respective magnetic yokes. The head assembly also includes a pedestal of insulative material situated atop the main body and exhibiting a lateral dimension less than that of the main body. The pedestal protrudes upwardly away from the main body and substrate. The magnetic yokes each include a pole piece pair situated atop the pedestal, each pole piece pair including first and second magnetic pole pieces. Each pole piece pair exhibits a different geometry than another pole piece pair. Each pole piece pair forms a head which is adapted to reading/writing a track on a magnetic medium, the tracks of which are compatible with the geometry of that pole piece pair.

Claims

1. A thin film magnetic head assembly having a plurality of thin film magnetic heads, the thin film head assembly comprising:

a substrate;

an insulative main body positioned on the substrate and extending to a lateral edge;

a plurality of magnetic yokes positioned on the substrate and laterally enclosed within the insulative main body;

a plurality of coil structures enclosed within the insulative main body, ones of the plurality of coil structures being magnetically coupled to respective ones of the plurality of magnetic yokes, the magnetically-coupled coils and magnetic yokes corresponding to ones of a plurality of thin film magnetic heads;

a common pedestal of insulative material common to the plurality of thin film magnetic heads, the common pedestal positioned on the insulative main body and extending across the plurality of thin film magnetic heads to a lateral edge that extends interior to the lateral edge of the insulative main body, the pedestal having a plurality of apertures directly overlying the respective plurality of magnetic yokes, the pedestal protruding away from the insulative main body and substrate; and

the plurality of magnetic yokes including a pole piece pair positioned on the common pedestal, the pole piece pair including first and second magnetic pole pieces, at least one of the plurality of magnetic yokes extending through at least two of the plurality of apertures of the common pedestal to integrally couple to the pole piece pair, a gap region being formed between the first and second pole pieces of the pole piece pair, the pole piece pair and the gap region being supported by the common pedestal.

2. The thin film magnetic head assembly of claim 1 wherein the plurality of magnetic yokes include magnetic yokes that have different pole piece geometries by virtue of the pole piece pairs having different gap widths.

3. The thin film magnetic head assembly of claim 1 wherein the plurality of magnetic yokes include magnetic yokes that have different pole piece geometries by virtue of the pole piece pairs having different gap lengths.

4. The thin film magnetic head assembly of claim 1 further comprising a frame surrounding the insulative pedestal to provide structural integrity to the insulative pedestal.

5. The thin film magnetic head assembly of claim 1 wherein a layer of diamond-like carbon (DLC) wear material is positioned on the insulative pedestal and encloses a plurality of pole piece pairs.

6. The head apparatus of claim 5 wherein the DLC layer has a substantially rectangular geometry.

7. The thin film magnetic head assembly of claim 1 wherein the insulative main body has a substantially circular geometry.

8. The thin film magnetic head assembly of claim 1 wherein the pedestal has a substantially rectangular geometry.

9. The thin film magnetic head assembly of claim 1 wherein the insulative main body includes a plurality of layers of insulative material from which the main body is built up, the layers of insulative material being oriented generally parallel with respect to the substrate.

10. The thin film magnetic head assembly of claim 1 wherein each magnetic yoke includes first and second side poles having a plurality of layers of magnetic material built up within the insulative main body, the first and second side poles being oriented generally normal with respect to the substrate.

11. The thin film magnetic head of claim 1 wherein the gap region of each pole piece pair exhibits a substantially L-shaped cross section.

12. A thin film magnetic head assembly according to claim 1 wherein:

the plurality of magnetic yokes include magnetic yokes that have pole piece pairs with different pole piece geometries.