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Magnetoresistive element, magnetic head assembly, and magnetic recording/reproducing apparatus

Patent Number: 8446698
Publication Date: 2013-05-21
Inventors: ;

A magnetoresistive element includes a lamination body and a pair of electrodes. The lamination body includes a first magnetic layer, a second magnetic layer, and a spacer layer. The spacer layer is provided between the first magnetic layer and the second magnetic layer and includes an oxide layer. The oxide layer includes at least one element selected from the group consisting of Zn, In, Sn, and Cd, and at least one element selected from the group consisting of Fe, Co, and ...

Magnetic head suspension with optimized inclination angle

Patent Number: 8446697
Publication Date: 2013-05-21
Inventor:

In a magnetic head suspension according to the present invention, each of paired right and left connecting beams that are positioned on both sides of an open section, with which paired piezoelectric elements are at least partially overlapped in a plan view, in a suspension width direction and connect a proximal end section that is directly or indirectly connected to a main actuator and a distal end section to which the load bending part is connected includes proximal-side and distal-side ...

Suspension having a short flexure tail, head gimbal assembly and disk drive unit with the same

Patent Number: 8446696
Publication Date: 2013-05-21
Inventor:

A suspension for a head gimbal assembly comprises a flexure having a flexure having a tail with a plurality of electrical traces and a plurality of bonding terminals adapted for connecting with a flexible printed circuit formed thereon. Each of the bonding terminals comprises a connecting pad and a hole formed at one end of the connecting pad for electrically and mechanically connecting the connecting pad to the flexible printed circuit by bonding material. And the connecting pad has a ...

Suspension ring gimbal having forwardly extending torsion arms

Patent Number: 8446695
Publication Date: 2013-05-21
Inventors: ; ;

For decreased pitch and roll stiffness, a ring gimbal suspension for a hard disk drive has torsion arms that extend toward the distal end of the suspension as they extend inward from the gimbal outer arms toward the slider bond pad. The torsion arms connect to the slider bond pad at a location that is distal of the dimple contact point. The electrical circuit traces are generally free of stainless steel except where the circuit traces cross the torsion arms, at which point they are affixed ...

Disk drive head suspension assembly with embedded in-plane actuator at flexure tongue

Patent Number: 8446694
Publication Date: 2013-05-21
Inventor:

A head gimbal assembly (HGA) for a disk drive includes a mounting plate configured to be attachable to an actuator arm, a load beam extending from the mounting plate, a laminated flexure, first and second piezoelectric elements, and a read head. The laminated flexure includes a fixed portion that is attached to the load beam, and a head mounting tongue that is connected to the fixed portion by first and second compliant members. The read head is bonded to the head mounting tongue. The ...

System and method for a subambient pressure air bearing slider utilizing negative pressure grooves

Patent Number: 8446693
Publication Date: 2013-05-21
Inventors: ;

A system and method are disclosed for a subambient pressure air bearing slider utilizing negative pressure grooves. In one embodiment, a groove extends from a slider's leading edge, splits, and terminates in two locations at the slider's trailing edge. In one embodiment, a groove is provided in a slider's compression pad near the trailing edge of the ...

Perpendicular magnetic recording head laminated with AFM-FM phase change material

Patent Number: 8446692
Publication Date: 2013-05-21
Inventors: ; ; ; ;

A PMR writer is disclosed that minimizes pole erasure during non-writing and maximize write field during writing through an AFM-FM phase change material that is in an anti-ferromagnetic (AFM) state during non-writing and switches to a ferromagnetic (FM) state by heating during writing. The main pole layer including the write pole may be comprised of a laminated structure having a plurality of “n” ferromagnetic layers and “n−1” AFM-FM phase change material layers arranged in an ...

High data rate magnetic writer design

Patent Number: 8446689
Publication Date: 2013-05-21
Inventors: ; ; ;

A high speed magnetic data writer containing a stitched pole tip that works in conjunction with the main pole is disclosed, together with a process for their manufacture. The material composition of each of these two sub-structures is slightly different; one sub-structure is optimized for high magnetic damping while the other sub-structure is optimized for high saturation ...

Magnetic disk drive and method for controlling microactuator in magnetic disk drive

Patent Number: 8446687
Publication Date: 2013-05-21
Inventors: ;

According to one embodiment, a magnetic disk drive includes a detector and a servo controller. The detector detects, as actual timestamps, time intervals at which a head reads servo sync marks recorded on a disk at predetermined intervals. The servo controller controls a VCM actuator and a microactuator with feedback control in order to position the head at a target position. The servo controller comprises a feedforward controller configured to compensate for disturbance. The feedforward ...

Information storage apparatus, servo pattern formation control apparatus, and recording medium

Patent Number: 8446686
Publication Date: 2013-05-21
Inventor:

According to one embodiment, an information storage apparatus, includes: a recording medium with a first servo pattern having absolute position information and a second servo pattern having relative position information; a record reproducing head; a standard position detector calculating a standard position of the second servo pattern where an absolute position on the recording medium is specified, from a positional relationship between the first servo pattern and the second servo pattern; ...

Servo frame interval correction apparatus, storage apparatus and servo frame interval correction method

Patent Number: 8446685
Publication Date: 2013-05-21
Inventor:

One aspect of the embodiment utilizes a servo frame interval correction apparatus which includes a detection unit for detecting a first servo frame formed on said recording medium. The apparatus includes an acquiring unit acquiring a detection time interval between said first servo frame and a second servo frame detected subsequently to the first servo frame from a table storing a detection time interval between a specific servo frame and a servo frame detected subsequently to the specific ...

Magnetic tape servo format allowing for increased linear tape density and systems thereof

Patent Number: 8446684
Publication Date: 2013-05-21
Inventors: ; ;

According to one embodiment, a magnetic recording tape includes a plurality of servo tracks, each servo track comprising a series of magnetically defined bars having an average height of between about 80 microns and about 120 microns, wherein an average stripe angle of the bars is between about 10° and about 25°. A stripe angle is measured between a longitudinal axis of each respective bar and a line oriented perpendicular to a direction of tape travel and parallel to a plane of the tape, ...

Systems and methods for data pre-coding calibration

Patent Number: 8446683
Publication Date: 2013-05-21
Inventors: ;

Various embodiments of the present invention provide systems and methods for selecting between pre-coding and non-pre-coding. As an example, a data processing circuit is disclosed that includes: a first data detector circuit, a second data detector circuit, a first comparator circuit, a second comparator circuit, and a pre-code selection circuit. The first data detector circuit is selectably configurable to operate in a pre-coded state, and operable to apply a data detection algorithm on a ...

Magneto-resistive effect element having spacer layer with thin central portion

Patent Number: 8441763
Publication Date: 2013-05-14
Inventor:

A magneto-resistive effect (MR) element includes first and second magnetic layers in which a relative angle formed by magnetization directions changes in response to an external magnetic field, and a spacer layer positioned between the first magnetic layer and the second magnetic layer. The spacer layer, on an air bearing surface, has a larger film thickness at both side edge parts in a track width direction than a film thickness at a central part in a track width direction. When a region ...

Magnetic head suspension having a supporting part with connecting beams

Patent Number: 8441762
Publication Date: 2013-05-14
Inventor:

Hard disk drive suspension with reduced PSA change due to humidity and temperature variations

Patent Number: 8441761
Publication Date: 2013-05-14
Inventors: ; ;

In a disk drive suspension circuit, in order to improve stability of the stable pitch static attitude (PSA) over changes in humidity, the suspended portion of the flexible circuit and/or the gimbal support arm are modified to change their response(s) to humidity. In one embodiment, hygroscopic material such as the material of the insulating layer are added to the stainless steel gimbal support arm, so that in response to humidity it bends in the opposite direction as the suspended portion ...

Suspension for supporting a magnetic head slider

Patent Number: 8441760
Publication Date: 2013-05-14
Inventor:

Provided that a distance between a distal edge of a supporting part and a dimple is represented by L1, a load beam part is bent around a first bending line within a center region away from the distal edge of the supporting part by more than or equal to 0.4*L1 and less than or equal to 0.6*L1 and also around a second bending line positioned closer to a proximal side in the suspension longitudinal direction than the first bending line. Paired leaf springs are bent around ...

Fluid dynamic bearing unit and disk drive device including the same

Patent Number: 8441759
Publication Date: 2013-05-14
Inventor:

A first sleeve rotatably extends around a shaft. First and second flanges are fixed to the shaft. A second sleeve extending around the first sleeve is fixed thereto. A first annular member fixed to the second sleeve surrounds the first flange. A second annular member fixed to the second flange surrounds a portion of the second sleeve. A first capillary seal includes a clearance between the first flange and the first annular member. A second capillary seal includes a clearance between the ...

Self-assembly structures used for fabricating patterned magnetic media

Patent Number: 8441758
Publication Date: 2013-05-14
Inventor:

Methods of defining servo patterns and data patterns for forming patterned magnetic media are described. For one method, a lithographic process is performed to define a servo pattern in servo regions on a substrate. The lithographic process also defines a first data pattern in data regions of the substrate. The first data pattern is then transferred to (i.e., etched into) the data regions. Self-assembly structures are then formed on the data pattern in the data regions to define a second ...

Servo pattern transfer

Patent Number: 8441754
Publication Date: 2013-05-14
Inventors: ;

A servo master having a pattern capable of being magnetically transferred as a servo pattern to a magnetic recording medium, wherein the servo master is formed of a material having a magnetic anisotropic constant perpendicular to a surface of the magnetic recording medium. The magnetic transfer method can include preparing a servo master patterned with a servo pattern to be formed on a magnetic recording medium, and arranging the servo master on the magnetic recording medium and applying an ...

Systems and methods for reducing low frequency loss in a magnetic storage device

Patent Number: 8441753
Publication Date: 2013-05-14
Inventor:

Various embodiments of the present invention provide systems and methods for reducing low frequency loss in a magnetic storage device. For example, a data processing circuit is disclosed that includes an amplifier, two filters and a summation element. The amplifier provides an amplified output that is filtered using a first of the two filters to create a first filtered output. The first filtered output is then filtered using the second of the two filters to create a second filtered output. ...

Dibit pulse extraction methods and systems

Patent Number: 8441752
Publication Date: 2013-05-14
Inventors: ; ;

A receiving device may be configured to derive an oversampled dibit pulse response estimate using symbols sampled at substantially the read channel symbol rate of the receiving device. The receiving device may include a data acquisition circuit configured to digitize data derived from a memory medium, as well as a dibit pulse estimation circuit configured to estimate the oversampled dibit pulse response using symbols sampled at the read channel rate of the receiving ...

Dibit pulse extraction methods and systems

Patent Number: 8441751
Publication Date: 2013-05-14
Inventors: ; ;

A receiving device may be configured to derive an oversampled dibit pulse response estimate using symbols sampled at substantially the read channel symbol rate of the receiving device. The receiving device may include a data acquisition circuit configured to digitize data derived from a memory medium, a symbol timing loop and read circuit, as well as a dibit pulse estimation circuit configured to estimate the oversampled dibit pulse response using symbols sampled at the read channel rate of ...

Method and system for compensating for adjacent tracks during reading of data

Patent Number: 8441750
Publication Date: 2013-05-14
Inventors: ; ;

A storage controller includes a device controller and a read data channel. The read data channel includes a decoder for decoding output of a detector, where the detector is for reading data requested from a storage medium by the device controller, and the storage medium has a plurality of tracks of data thereon. When the device controller requests data from a current track of data on the storage device, the detector reads an adjacent track of data, the decoder decodes data from the adjacent ...

Magnetic coupling type isolator

Patent Number: 8437107
Publication Date: 2013-05-07
Inventor:

A magnetic coupling type isolator includes: a magnetic field generator for generating an external magnetic field by an input signal; a magnetoresistive element for detecting the external magnetic field and converting the detected magnetic field into an electric signal, the magnetoresistive element being electrically insulated from the magnetic field generator and positioned in a location capable of being magnetically coupled so as to be overlapped with the magnetic field generator as seen ...

Thin film magnetic head including spin-valve film with free layer magnetically connected with shield

Patent Number: 8437106
Publication Date: 2013-05-07
Inventor:

A thin film magnetic head includes; an MR film that includes a pinned layer of which a magnetization direction is pinned, a free layer of which a magnetization direction varies, and a spacer that is disposed therebetween; a pair of shields that are disposed on both sides sandwiching the MR film in a direction orthogonal to a film surface of the MR film; and an anisotropy providing layer that provides anisotropy to a first shield so that the first shield is magnetized in a desired direction, ...

Magnetic sensor with composite magnetic shield

Patent Number: 8437105
Publication Date: 2013-05-07
Inventors: ; ; ; ; ;

A magneto-resistive reader includes a first magnetic shield element, a second magnetic shield element and a magneto-resistive sensor stack separating the first magnetic shield element from the second magnetic shield element. The first shield element includes two ferromagnetic anisotropic layers separated by a grain growth suppression ...

Read/write apparatus and method for a magnetic storage medium comprised of magnetic nanoparticles contained within nanotubes

Patent Number: 8437104
Publication Date: 2013-05-07
Inventor:

A magnetic storage medium is formed of magnetic nanoparticles that are encapsulated within nanotubes (e.g., carbon ...

Multichannel time based servo tape media

Patent Number: 8437103
Publication Date: 2013-05-07
Inventor:

A thin film magnetic recording head is fabricated by forming a substrate from opposing ferrite blocks which have a ceramic member bonded between them. This structure is then diced to form a plurality of columns, wherein each column has a ferrite/ceramic combination. Each column represents a single channel in the completed head. A block of ceramic is then cut to match the columned structure and the two are bonded together. The bonded structure is then cut or ground until a head is formed, ...

Perpendicular magnetic head with side shield depth less than write gap film

Patent Number: 8437102
Publication Date: 2013-05-07
Inventors: ; ;

Embodiments in accordance with the present invention provide a magnetic head having a narrow track width and excellent in productivity for the purpose of realizing a disk storage unit having a large capacity. In a magnetic head having a plurality of flairs on a main magnetic pole, a side shield is formed via a non-magnetic film on both sides of the flair disposed close to an air bearing surface in such a fashion as to be aligned with the ...

Disk drive with a spherical balance plug

Patent Number: 8437101
Publication Date: 2013-05-07
Inventors: ;

Described herein is a balance plug for a disk drive. The balance plug includes a body defining a substantially spherical outer surface and a plurality of ribs along the spherical outer surface and defining at least three meridians along the outer surface of the sphere. The at least three meridians can reside in at least two transverse ...

Flexure based shock and vibration sensor for head suspensions in hard disk drives

Patent Number: 8437100
Publication Date: 2013-05-07
Inventors: ; ;

Systems and methods for flexure based shock and vibration sensor for head suspensions in hard disk drives. Specifically, this invention deals with operational shock and vibration management within a hard disk drive. In one implementation, the assembly includes a circuit embedded optical waveguide sensor that includes a flexible electrical circuit board with a configuration of either a single or multi layers of conductor traces, a thin flexure gimbal for carrying and flying a HDD slider, a ...

Hard disk drive and servo track writing system for the same

Patent Number: 8437099
Publication Date: 2013-05-07
Inventors: ;

A hard disk drive includes a housing including a base member and a cover member, a spindle motor disposed in the housing, a data storage disk disposed on the spindle motor, an actuator disposed in the housing to move a read/write head to a position on the data storage disk, a clock signal providing unit disposed on the data storage disk to provide a clock signal of the data storage disk, a position signal providing unit disposed on the actuator to provide a position signal of the actuator, ...

Magnetic disk drive using a non-volatile storage device as cache for modified tracks

Patent Number: 8437098
Publication Date: 2013-05-07
Inventor:

Provided are a computer program product, system, and method for a magnetic disk drive. The disk drive has at least one disk platter having at least one recordable disk surface having an areal density of at least 200 gigabits per square inch. Either a diameter of the at least one disk platter is greater than 3.5 inches or the at least one disk platter rotates at less than 5400 RPMs. A read/write head reads and writes tracks of data with respect to the at least one disk surface. Modified ...

Magnetic detection element

Patent Number: 8432646
Publication Date: 2013-04-30
Inventors: ;

Embodiments of the present invention help to reduce etching damage at end parts of a magnetoresistive sensor in ion beam etching. According to one embodiment, ion beam etching (IBE) is used in a magnetoresistive sensor track width forming step. This IBE irradiates Ar ion beam to a substrate in a state that the substrate is inclined and further rotates the substrate about its normal as a rotational axis. In a conventional track width forming step, the IBE irradiates the Ar ion beam to the ...

Magneto-resistive effect element, magnetic head, magnetic head slider, head gimbal assembly and hard disk drive apparatus

Patent Number: 8432645
Publication Date: 2013-04-30
Inventor:

An MR element includes a stack, being a pillar or trapezoidal stack, including first and second magnetic layers in which a relative angle formed by magnetization directions changes according to an external magnetic field, and a spacer layer that is positioned between the first magnetic layer and the second magnetic layer, and that is provided with a main spacer layer that is composed of gallium oxide, zinc oxide or magnesium oxide as a primary component, wherein, one part of side surfaces ...

Spin torque oscillator sensor enhanced by magnetic anisotropy

Patent Number: 8432644
Publication Date: 2013-04-30
Inventor:

A spin torque oscillator device having a magnetic free layer with a magnetic anisotropy that has a component that is oriented perpendicular to a direction of an applied magnetic field. The spin torque oscillator device includes a magnetic reference layer, a magnetic free layer and a non-magnetic layer sandwiched there-between. A component of the magnetic anisotropy of the free layer can be oriented perpendicular to a magnetization of the reference layer, and this orientation relative to the ...

Electromagnetic heads, flexures, gimbals and actuators formed on and from a wafer substrate

Patent Number: 8432643
Publication Date: 2013-04-30
Inventor:

Devices for reading or writing electromagnetic information include a wafer substrate piece disposed between an electromagnetic transducer and an electrostrictive or piezoelectric actuator. The substrate piece is shaped as a rigid body adjoining the transducer and as a flexible element connecting the body and the actuator. To fabricate, at least one electrostrictive layer and many transducers are formed on opposite sides of a wafer that is then cut into rows containing plural transducers. ...

Magnetic head suspension having a supporting part with an edge formed into a concave shape

Patent Number: 8432642
Publication Date: 2013-04-30
Inventor:

Disk drive with multi-zone arm damper

Patent Number: 8432641
Publication Date: 2013-04-30
Inventor:

Described herein is a disk drive having a head stack assembly with an actuator arm that is rotatable about an axis of rotation and has a damping layer disposed on the actuator arm. The damping layer has first and second damping portions, which can include an adhesive or viscoelastic layer. The first damping portion has different damping properties than the second damping ...

Tape drive having a flangeless roller

Patent Number: 8432640
Publication Date: 2013-04-30
Inventor:

A tape drive comprising a head configured to read data from a tape and to write data to the tape, a pair of flanged guide rollers arranged one on either side of the head to guide the tape longitudinally over the head, and a flangeless inertial roller arranged between a flanged guide roller and the head to add inertia to the tape so as to limit speed and movement of the tape as it passes over the ...

Servo write head gap width correction

Patent Number: 8432635
Publication Date: 2013-04-30
Inventor:

A pulse mismatch is measured for servo stripes on magnetic tape written with a servo write head having servo head gaps with different physical sizes. The servo head gaps are separately energized to correct the pulse mismatch so servo stripes written on the magnetic tape are within a predefined ...

Identifying error built into a medium

Patent Number: 8432634
Publication Date: 2013-04-30
Inventor:

An apparatus includes plural spaced apart sensors arranged along a direction of motion of a medium, and a processing circuit to receive signals from the sensors, determine a difference of the signals, and identify an error built into the medium based on the ...

System, method and apparatus for storage architecture for bit patterned media using both erase band and shingled magnetic recording

Patent Number: 8432633
Publication Date: 2013-04-30
Inventors: ;

Storage architecture for bit patterned media uses both erase band and shingled magnetic recording. A hard disk drive may comprise a disk having bit patterned media with a plurality of data tracks arrayed in architecture pages having at least one of erase band mode (EBM), shingled mode (SM) and unallocated space. An actuator has a head for writing data to the data tracks of the bit patterned media. A control system monitors, reallocates and reconfigures the architecture pages from EBM, SM or ...

Magnetic disk drive using a non-volatile storage device as cache for modified tracks

Patent Number: 8432632
Publication Date: 2013-04-30
Inventor:

Disk spindle assembly cartridge

Patent Number: 8432631
Publication Date: 2013-04-30
Inventors: ; ;

A disk spindle assembly cartridge is described. The disk spindle assembly cartridge includes a base, a spindle motor attached to the base, a disk seated on the spindle motor, a disk clamp attached to the spindle motor, wherein the disk clamp secures the disk to the spindle motor, and a cover attached to the base. The base is configured to detachably mount a head stack assembly cartridge, where the disk is accessible to a head stack assembly pivotally mounted in the head stack assembly ...

Disk drive component test system

Patent Number: 8432630
Publication Date: 2013-04-30
Inventor:

A hard drive component test system is provided. The hard drive component test system includes a rack having multiple test bays with first test sub-assemblies mounted in respective ones of the of test bays. A test control system is electrically coupled to each of the first test sub-assemblies. Each of the test bays is configured to receive a second test sub-assembly and to engage the second test sub-assembly with the first test sub-assembly mounted in the respective bay to form a drive ...

Disk drive centering sync frames on sync marks of a spiral track

Patent Number: 8432629
Publication Date: 2013-04-30
Inventors: ; ;

A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of spiral tracks. A first sync frame is first opened in response to a first frame offset during a first revolution of the disk, wherein the first sync frame corresponds to the head approaching a first sync mark in a first spiral track crossing. A first sync frame position error signal (PES) is generated representing a difference between a target framing of the first sync frame around the first sync mark ...