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7626384 |
Magneto-resistive sensor with test mode activation
According to an example embodiment, there is a magneto-resistive (MR) sensor having an operation mode and a test mode. The MR sensors comprise a first plurality of first MR elements and a second...
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7622915 |
Magnetic head test method and magnetic head tester
A magnetic head assembly having a mounting base in which a mounting hole having a protruded peripheral edge is formed is easily mounted on a head clamp table positioning the magnetic head assembly...
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7612555 |
High-resolution magnetic encoder
A high-resolution magnetic encoder system includes a magnetic resistive sensor, a fixed suspension, and a mechanism. The magnetic resistive sensor is mounted to the fixed suspension above a...
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7573259 |
Multi-track sense magnet with reduced cross-talk
A multi-track sense magnet for use in a system for sensing the relative displacement of two elements, and including a magnetic structure that is moveable relative to detector devices for detecting...
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7564235 |
Determination of magnetic read head properties
A method, computer-readable medium, and apparatus for measuring properties of a magnetic read head are provided. In one embodiment, the method includes providing a first and a second magnetic read...
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7564236 |
Thermal fly height induced shield instability screening for magnetoresistive heads
A method for testing magnetic heads formed on a wafer to detect the presence of thermal induced popcorn noise resulting from thermal fly height control. The method includes performing a quasi test...
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7550967 |
Closed loop magnet control for magnetic recording head testing apparatus
A magnetic recording head tester uses closed loop control to accurately control the magnetic field that is generated to test the magnetic recording head. The closed loop control compares the value...
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7549215 |
Method for manufacturing a magnetic head for perpendicular magnetic data recording
A structure and method for performing magnetic inductance testing of write heads formed on a wafer. The structure and method allows for the effective inductive testing of magnetic write heads at...
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7545139 |
Testing method and apparatus of thin-film magnetic head
A testing method of a thin-film magnetic head has an MR read head element with a multi-layered structure including a magnetization-fixed layer, a magnetization-free layer and a nonmagnetic...
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7538546 |
In-plane magnetic field generation and testing of magnetic sensor
A set of magnets, e.g., electromagnets, are used to produce an in-plane magnetic field with respect to an article under test or manufacture. The set of electromagnets includes electromagnets that...
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7532006 |
Stand-alone quasi-static tester
A quasi-static tester is disclosed. The quasi static tester comprises: a mount configured to fix a head gimbal assembly in a given position; a camera configured to observe the head gimbal assembly...
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7525307 |
System and method for hard drive component testing
Embodiments of the present invention include a method and System for Hard Drive component testing, particularly for magnetic recording head testing. The method of testing magnetic recording heads...
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7514916 |
CCP-CPP-GMR head assembly, magnetic recording/reproducing apparatus, and specification method of appropriate sense current direction of CCP-CPP-GMR head
Disclosed is a CCP-CPP-GMR head assembly which has: a CCP-CPP-GMR head that includes at least a current control layer having as a microstructure a plurality of truncated cone electric conductors...
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7506282 |
Apparatus and methods for predicting and/or calibrating memory yields
An apparatus and methods for predicting and/or for calibrating memory yields due to process defects and/or device variations, including determining a model of a memory cell, identifying a subset of...
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7496817 |
Method for determining integrity of memory
A method for testing the integrity of a memory with defective sections under a plurality of operating environments includes testing the memory with defective sections under a plurality of operating...
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7496808 |
Parallel bit test circuit in semiconductor memory device and associated method
An embodiment is a circuit including 2 n−1 first comparators to generate a first result by comparing data from at least two of 2 n memory cells to which test pattern data are written. 2 n−1 ...
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7471081 |
Slider tester
A slider tester includes a driving unit that rotates a test medium, a set plate that detachably supports a slider as a single body, and an investigating apparatus that is electrically connected to...
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7429857 |
Magnetic head and disk X-Y test assembly with optimized arrangement for skew angle
A magnetic head and disk tester comprises a base, a spindle for rotationally supporting a magnetic disk, a carriage for supporting a magnetic head support which carries a magnetic head with a...
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7425826 |
Selectively conductive structure wherein a magnetic conductor is sized to have a cross-section diameter similar to a Fermi wavelength of electrons
The invention includes a conductor with a first side and a second side. The conductor may be sized to have a cross-section diameter substantially similar to a Fermi wavelength of electrons in the...
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7417423 |
Method of testing a magnetic head for eliminating defective magnetic heads
The method of testing a magnetic head is capable of purely evaluating characteristics of the magnetic head without influences caused by external factors. The method of testing a magnetic head...
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7414394 |
Method of quality-testing a shield film of a magnetoresistive effect head
When testing the quality of shield films of magnetoresistive effect heads, a method of testing and a testing apparatus can detect heads where the shield magnetic domain is susceptible to changing...
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7411389 |
Method of detecting changes in operability status of a slider mover in a disk drive
A method for monitoring the operability of a slider of a disk drive includes the steps of providing a slider that includes a read/write head that magnetically interacts with a storage disk, and a...
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7397111 |
Semiconductor wafer, an electronic component, and a component carrier for producing the electronic component
An electronic component includes a semiconductor chip with a chip topside, an integrated circuit, and a chip backside. The chip backside includes a magnetic layer. The electronic component further...
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7368905 |
System, method, and apparatus for use of micro coils within a single slider test nest
A precisely machined test nest holds a single hard disk drive slider. The test nest is fabricated to contain a micro pickup coil that is positioned to be able to detect magnetic flux from a write...
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7365531 |
Magnetic reader recording characterization at slider or bar level
An apparatus for reader characterization is described. The apparatus includes a rotator for rotating a media. The media can contain a signal having a value for a function of a read/write head being...
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7355393 |
Magnetic head slider testing apparatus and magnetic head slider testing method
In the present invention, a coil generating DC magnetic field applied to a magnetic head is divided into two in that a first coil and a second coil, which are provided on a frame shape core. An...
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7352175 |
Probe card method
A probe card method, wherein a base supports a probe pin and an electromagnet. When the probe pin contacts a magnetic-sensor terminal on a chip on a wafer, magnetic force is applied to a...
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7307418 |
Systems for recording position information in a magnetic layer on a piston rod
Described are system for recording piston rod position information in a magnetic layer on the piston rod. A piston rod has a magnetically hard layer formed thereon to provide a recording medium. A...
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7288935 |
System, method, and apparatus for dynamic electrical testing of workpieces by multiplexing test sites with shared electronics
A dynamic electrical tester (DET) for testing head gimbal assemblies (HGA) is disclosed. The DET simulates disk drive operation while significantly reducing tester capital investment. Multiple HGAs...
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7286315 |
Method to detect the touch down of the flying head on disk
A disk drive that contains a fly on demand head (FOD) and a process for determining contact between the FOD head and a disk. The head includes a heating coil that can receive various levels of...
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7276900 |
Magnetic characteristic inspecting apparatus and inspecting method using it
A magnetic characteristic inspecting apparatus including a plurality of disk rotating devices or a plurality of magnetic heads include a unit for switching output signals of write signal production...
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7249406 |
Method to detect magnetic pole defects in perpendicular recording heads at wafer level
The perpendicular magnetic head fabrication and testing method includes the additional fabrication of magnetic pole testing structures in the kerf area of the wafer substrate. Particularly,...
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7248039 |
Disk pack swap process for evaluating magnetic recording performance
A method for testing electromagnetic characteristics of magnetic media while maintaining consistent performance of a read/write head and recording channel is disclosed. The disclosed method is...
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7230420 |
Magnetoresistive element lifecycle tester with temperature control
A lifecycle analyzer includes a temperature control element for controlling the temperature of a plurality of magnetoresistive (MR) elements, which may be, e.g., in bar, slider, head gimbal...
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7196512 |
Magnetic head tester
The magnetic head tester of the present invention drives a medium for rotation to float a slider from the medium so as to test a magnetic head for its characteristics, and the tester includes a...
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7196513 |
Method for testing magnetic hard disk or magnetic head
A testing method for a magnetic hard disk or a magnetic head in a test system includes a moving step in which the magnetic head, which moves to fly closely over the magnetic disk, moves to a...
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7194802 |
Tool for certifying a head-gimbal assembly
A device and method for testing a slider of a head-gimbal assembly during disc drive manufacturing. The device includes a test disc, an actuator arm and a control module. The test disc has a first...
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7187166 |
Electrical property evaluation apparatus
An electrical property evaluation apparatus for measuring an electrical property of an object includes a magnetic field generating mechanism that generates a magnetic field in a target area on the...
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7183762 |
Apparatus and method for evaluating magnetic heads, and disk for use in evaluating magnetic heads
A DC current is supplied to the write coil of a GMR head 1 equipped with a completed HGA (Head Gimbal Assembly). The element part of the GMR head 1 is thereby thermally deformed. Thus deformed,...
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7164353 |
Method and system for testing RFID devices
A method and system for testing a plurality of RFID devices disposed on a common carrier. In one embodiment, the RFID devices are evenly spaced along the length of the carrier, and the system...
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7138797 |
Reverse magnetic reset to screen for weakly pinned heads
A method is disclosed for testing pinned layers of magnetic disk drive read heads having at least one pinned layer, where the magnetic orientation of the pinned layers has been set in an initial...
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7135861 |
Movable stage, XY stage, head carriage and tester of magnetic head or magnetic disk
Pressing means is provided to press a movable base to a surface of a reference base to make the movable base in contact with the surface of the reference base to thereby lock-down the movable base...
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7129702 |
XY stage, head carriage and tester of magnetic head or magnetic disk
An XY stage includes a movable frame having a rectangular space inside thereof and movable on a reference base along one of X and Y axes, a first drive source provided in the reference base for...
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7124654 |
Method for determining a microactuator range of movement
A spin stand testing system is used to determine a positioning range of a microactuator disposed on a head gimbal assembly. The microactuator is configured to laterally translate a read sensor of a...
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7119537 |
Full track profile derivative method for read and write width measurements of magnetic recording head
A method for measuring a magnetic read width MRW of a magnetic read sensor directly from the derivative of a full track profile, with better accuracy and more advantages than the micro-track method...
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7109701 |
Method for testing magnetic hard disk or magnetic head
A testing method for a magnetic hard disk or a magnetic head in a test system includes a moving step in which the magnetic head, which moves to fly closely over the magnetic disk, moves to a...
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7092179 |
Write precompensation amount setting method and apparatus
A write precompensation amount setting method and apparatus comprise a function detecting the respective head characteristics with an electric current used at an ordinary temperature and a...
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7076391 |
Methods and systems for asynchronously testing a plurality of disk drives
An asynchronous system for testing disk drives includes a test platform that includes a plurality of slots for receiving and for providing communication with drives. The slots are segregated into a...
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7075294 |
Method of inspecting thin-film magnetic head and method of making thin-film magnetic head
In the method of inspecting a thin-film magnetic head, a thin-film magnetic head provided with a magnetoresistive film having a free layer whose magnetization direction changes depending on an...
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7064539 |
Method for hard disk drive flip disk diagnostics
A method for identifying a problem with a magnetic disk, comprising testing both sides of a disk for read errors using a pair of heads, flipping the disk 180 degrees, again testing both sides of...
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