Read Rite Corporation

Memorex Corporation

Minnesota Mining and Manufacturing Company

Quinta Corporation

Peter G Bischoff

Chak M Leung

Edgar M Williams

Johnny C Chen

Daniel A Nepela

Theodore A Schwarz

John R Osborne

Pradeep Thayamballi

Yugang Wang

Hua-Ching Tong

Erich P Valstyn

Ross W Stovall

Stephen S Murray

Shih-Cheng Cheng

Robert A Cole

Vincent D Retort

Carroll S Gooden

David J Rauch

Shin-ichi Akoh

An interposer for assembly between an integrated circuit and a circuit panel includes an upper insulation layer and a plurality of upper contact pads arranged in a desired pattern in the upper insulation layer. A plurality of micro-devices are formed between the upper insulation layer and a bottom insulation layer having a plurality of lower contact pads arranged in a desired pattern. The upper and the lower contact pads are selectively and electrically interconnected via the micro-devices. The upper and the lower contact pads are overlaid with solder balls to provide the required electrical connection and mechanical coupling between the interposer, the integrated circuit, and the circuit panel. The interposer is made by forming an array of upper contact pads on a substrate; depositing an upper layer of encapsulant material on the substrate; planarizing the substrate and exposing the array of upper contact pads; forming a micro-device; forming an array of lower contact pads; forming a bottom insulation layer; and exposing at least some of the lower contact pads. According to another embodiment, the interposer includes a plurality of electrically conductive terminals that extend outwardly from the lower contact pads for establishing an electrical connection and a mechanical spring action between the integrated circuit and the interposer, in order to absorb excess contraction or expansion.

Interposer with embedded circuitry and method for using the same to

A thin film magnetic head is fabricated having soft metal layers of 0.25 to 1 micron thickness disposed on each side of the first and second magnetic layers of Permalloy forming the magnetic yoke. The soft layers are formed between the ceramic substrate and the first Permalloy layer, between the first Permalloy layer and the insulation surrounding the electrical coil of the head, between the insulation and the second Permalloy layer, and between the second Permalloy layer and the insulating overcoat of the head. The soft metal has a coefficient of thermal expansion between that of the Permalloy and that of the ceramic substrate and insulation materials. In this way, stress buffers are provided to minimize the mismatch and thermal stress transfer between the Permalloy and the other materials of the adjacent layers, resulting in improved domain stability and a significant reduction in popcorn noise.

Thin film magnetic head with stress relief layering

A thin-film coil for use in a flying magneto-optical data storage system is formed on an undercoat layer, and includes an underside and a conductor deposited on the undercoat layer. The conductor is covered by an insulation layer on which a yoke is formed for providing a path to a magnetic field generated by the conductor. The yoke is formed of three sections: an upper section, an intermediate section, and the tip. The yoke tip defines an optical opening and has its underside substantially flush with the underside of the undercoat layer for increasing the density of the magnetic field at a target distance from the coil. The yoke tip underside is defined by an inner edge that delineates the optical opening, and that is formed of two semi-circular sections and two linear sections tangential to the semi-circular sections. The yoke can optionally include an outer section that extends over the peripheral side of the insulation layer and that further extends in an enlarged toe section.

Thin-film electro-magnetic coil design for use in a flying

A thin film magnetic head is fabricated with a multiplicity of magnetic yokes that interact effectively with an electrical coil. The magnetic P1 and P2 pole sections of the yoke are very narrow and form closely spaced envelopes about the coil. The multiple yokes are inductively linked to the coil so as to provide an increased number of flux interactions for a given length of coil turn. With this magnetic head design, signal output is increased, thermal noise is reduced, and the signal-to-noise ratio is effectively improved.

Thin film magnetic heads with multiple yokes

A thin film magnetic head is fabricated with shaping magnetic thin films, preferably formed of Permalloy, which have a stepped configuration. The thin films are deposited between the insulation layer surrounding the electrical coil and below the second pole layer P2 to form a double yoke. The thin films have corners at the stepped areas which pin the domain sites so that the magnetization of the P2 layer is properly aligned, thereby improving the data signal that is being recorded.

Configuring domain pattern in thin films of magnetic heads

A thin film magnetic head assembly useful for contact recording in a disk drive comprises an air bearing slider formed with only a single air bearing rail. The slider is substantially L-shaped having a leg portion on which a pedestal with an air bearing surface is provided. A wear pad is formed on the pedestal and encompasses the pole tips and transducing gap of the transducer. The wear pad makes contact with the magnetic disk during operation of the disk drive. The small area of the wear pad makes minimal contact with the surface of the magnetic disk so that frictional effects are significantly reduced thereby extending the wear life of the magnetic head. An alternative embodiment of a contact head slider uses a tripad design wherein the front pads fly relative to the disk and the rear pad which supports the transducer is in contact with the rotating disk during operation of a disk drive.

Thin film contact recording head

A thin-film magnetoresistive playback head having films providing magnetic shielding and magnetic bias. At least one of the magnetic shield layers is also conductive so that the functions of shielding and biasing are combined. Preferably, both shield layers are conductive. A multiple element channel head is disclosed in which the magnetic/conductive layers extend in series from one transducer section to the next, allowing a single bias current to bias all of the sections.

Method of making a magnetoresistive head with integrated bias and

Magnetoresistive head with integrated bias and magnetic shield layer

A thin film magnetic head is fabricated with a yoke structure, including P1 and P2 magnetic layers, having a width in the range of about 5 to 58 microns, preferably about 30 microns. The very narrow width minimizes popcorn noise, improves high frequency response and affords increased head circuit efficiency.

Thin film magnetic head with narrow yoke

A thin film tape head assembly is formed by depositing a multiplicity of thin film transducers on a ceramic wafer or substrate. The wafer is divided into head bars, each of which has one or more thin film transducers on its face. End sections and a cover bar are joined to the head bar to form a head bar subassembly. A flexible cable or electrical pins are provided between the end sections to enable electrical connection between the head circuit and external circuitry. By joining a number of head bar subassemblies, a multigap thin film tape head assembly is produced to serve as a read/write device.

Thin film tape head assembly

A thin film head assembly includes a coil structure having a thin coil layer that extends within and beyond the magnetic yoke area delineated between opposing magnetic pole pieces, and an additional coil layer formed as a step segment adjacent to the thin layer. The additional layer is spaced away from the pole pieces and the magnetic yoke area and provides a thickened coil area which affords a significant reduction in coil resistance.

Thin film head with coils of varying thickness

An adjustable transfer tool is used to compensate for row bow during lapping a bar or a row of magnetic head sliders. The adjustable transfer tool enables establishing uniform and substantially precise throat heights for a multiplicity of thin film transducers disposed on said sliders. To allow the desired adjustment, the transfer tool incorporates slot means by which the shape of the surface of the tool on which the bar of sliders is mounted can be modified so that the slider transducers assume a collinear array across its entire length for the lapping process. Adjustment is accomplished by manual means, such as by a screw or a tapered pipe plug, or by electrical means, such as a piezoelectric actuator, in conjunction with a computer or microprocessor.

Adjustable transfer tool for lapping magnetic head sliders

A thin film magnetic head is made with a center-tapped coil structure formed of three layers of coils. The middle coil is configured to be bifilar. When recording data on a magnetic medium, current flows through one-half of the bifilar coil and through one adjacent coil to create positive transitions, and for negative transitions, current flows through the other half of the bifilar coil and through the other adjacent coil. When reading the data that is recorded on a magnetic medium, all turns of the entire coil configuration operate for transducing the data.

Thin film magnetic head with three superimposed coils

The subject invention relates to the fabrication of metal oxide patterns on a substrate adapted for use with thin film magnetic heads. The metal oxide pattern has a precisely defined geometry including nearly vertical side walls, for minimizing read/write errors. In addition, a filler material formed from a non-magnetic, non-metallic compound is provided on the substrate in a pattern complimentary to the metal oxide pattern. In accordance with the subject invention, the top surface of the metal oxide pattern and the filler material are co-planar. By this arrangement, subsequent layers may be uniformly deposited without discontinuities. The subject method includes a plurality of distinct masking and etching steps in order to achieve the desired result.

Thin film magnetic recording transducer having embedded pole piece design

A method for fabricating a metallic pattern on a substrate is disclosed. The method consists of depositing an adhesive and/or plating base material on a substrate upon which a narrow self-supporting border of photoresist is applied. An anodic layer is then deposited and the photoresist removed. The adhesive and plating base material is etched in those areas previously covered by the photoresist and fresh photoresist applied to encapsulate those areas of the anodic layer which form the final pattern of interest. The unwanted anodic material is then etched and the photoresist removed.

Growing community of inventors

Cupertino, CA, United States of America

Peter G Bischoff