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| Number | Title | Issue Date |
| 8138754 | Method and apparatus for testing characteristics of thin-film magnetic head The characteristics of thin-film magnetic heads are evaluated by measuring, in a step and repeat method and apparatus, the magnetic field generated by the respective heads in a bar including multiple heads. ... | 03/20/2012 |
| 8120353 | Methods for detecting damage to magnetoresistive sensors A method for detecting a damaged magnetoresistive sensor in one embodiment includes measuring a resistance of a first sensor upon application thereto of a positive bias current; measuring the resistance of the first sensor upon application thereto of a negative bias... | 02/21/2012 |
| 8102173 | Thermal control system for test slot of test rack for disk drive testing system with thermoelectric device and a cooling conduit A disk drive test slot thermal control system includes a test slot including a housing having an outer surface, an internal cavity defined by the housing and including a test compartment for receiving and supporting a disk drive transporter carrying a disk drive for... | 01/24/2012 |
| 8085038 | Method for testing noise of thin-film magnetic head, and magnetic disk drive apparatus with noise testing function A noise-testing method for a thin-film magnetic head with an MR read head element and a heating unit capable of applying a heat and a stress to the MR read head element, includes a step of applying alternately and discontinuously with each other an electrical power ... | 12/27/2011 |
| 8080992 | Write head tester using inductance A write head is tested by measuring the effect that magnetic fields have on the inductance of the write head. For example, a perpendicular write head may be placed in a magnetic field with a first angle, e.g., non-parallel and non-perpendicular, to the air bearing s... | 12/20/2011 |
| 8072231 | Testing method of wafer with thin-film magnetic heads and manufacturing method of thin-film magnetic head A testing method of a wafer provided with a plurality of thin-film magnetic heads is provided. Each of the plurality of thin-film magnetic heads includes a main pole layer, a first test pad formed on the wafer and electrically connected with an extended top end sect... | 12/06/2011 |
| 8063630 | Testing method for thin-film magnetic head and jig used therefor In testing thin-film magnetic heads, first, a back surface opposite to a medium facing surface of each of a plurality of thin-film magnetic heads is attached to a first surface of a first plate of a jig, the jig including the first plate of rubber having the first a... | 11/22/2011 |
| 8040131 | Method for testing the acceptability of a magnetic read sensor A method for testing a magnetic head to determine whether the magnetic head is unacceptably affected by temperature variations. The test includes testing the magnetic head at different temperatures and measuring either or both of a signal amplitude and a signal asym... | 10/18/2011 |
| 8018226 | Methods for detecting damage to magnetoresistive sensors In one embodiment, a method for detecting a damaged magnetoresistive sensor includes analyzing readback signals of a plurality of sensors each being positioned over data tracks on a passing magnetic medium; determining whether at least one of the readback signals is... | 09/13/2011 |
| 8008912 | Method and system for testing P2 stiffness of a magnetoresistance transducer at the wafer level A method of testing P2 stiffness of a magnetoresistance (MR) sensor stack including a P2 pinned layer is provided. The method comprises the step of applying an external magnetic field to the MR sensor stack. The external magnetic field is oriented subs... | 08/30/2011 |
| 7990137 | Device of evaluating magnetic read head and method of evaluating magnetic read head An MR element having a magnetically free layer and a magnetic bias layer that applies a bias magnetic field to the magnetically free layer are included. Furthermore, a measuring section that measures a ferromagnetic resonance frequency f0 of the magnetically ... | 08/02/2011 |
| 7960968 | Testing method of magnetic head by using inductance It is an object of the present invention to provide a method for investigating magnetic domains, the method capable of easily grasping behavior of the magnetic domains in a head manufacturing process, and further to provide a testing method of a magnetic head capabl... | 06/14/2011 |
| 7932717 | Test components fabricated with pseudo sensors used for determining the resistance of an MR sensor Test methods and components are disclosed for testing resistances of magnetoresistance (MR) sensors in read elements. Test components are fabricated on a wafer with a first test lead, a pseudo sensor, and a second test lead. The test leads and MR sensor are fabricat... | 04/26/2011 |
| 7872471 | Testing method of head element and magnetic recording and reproducing apparatus capable of head evaluating Provided is a method for testing a head element that enables proper evaluation of the head element based on a characteristic of the head element under high-temperature and high-stress conditions. The testing method can be performed on a thin-film magnetic head inclu... | 01/18/2011 |
| 7855553 | Test components fabricated with large area sensors used for determining the resistance of an MR sensor Test methods and components are disclosed for testing resistances of magnetoresistance (MR) sensors in read elements. Test components are fabricated on a wafer with a first test lead, a test MR sensor, and a second test lead. The test leads and test MR sensor are fa... | 12/21/2010 |
| 7852072 | Test-device system for independent characterization of sensor-width and sensor-stripe-height definition processes A test-device system and method for deconvoluting measurements of effects of a sensor-width definition process from measurements of effects of a sensor-stripe-height-definition process in a manufacture of a magnetic sensor. The test-device system comprises a first t... | 12/14/2010 |
| 7723982 | Testing and manufacturing method of magnetic heads A magnetic head suffers mechanical stresses by striking against a magnetic disc surface and dust, so that there are problems such as the reduction of reproduction output due to the mechanical stresses and the reversal of output polarity due to the mechanical stresse... | 05/25/2010 |
| 7705588 | Apparatus and method for testing magnetic disk drive components using drive-based parts An apparatus and method for testing a component of a magnetic disk drive in which one or more drive-based components is used in the testing process. Each of the drive-based components is based on a corresponding one of the components of the magnetic disk drive. Duri... | 04/27/2010 |
| 7683610 | Method for inspecting magnetic characteristics of a plurality of thin magnetic heads by means of local application of magnetic field A method for inspecting magnetic characteristics of a thin film magnetic head that is arranged in a row bar includes: a step of preparing a row bar having sliders including a thin film magnetic head formed therein and lapping guides having magnetoresistance effect; ... | 03/23/2010 |
| 7667456 | Method and apparatus for testing magnetic head with TMR element A magnetic head testing apparatus having the function of evaluating pin holes in a tunnel barrier layer of a TMR element by a non destructive inspection is disclosed. The testing apparatus comprises a temperature control unit which sets a circumferential temperature... | 02/23/2010 |
| 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 by fitting the mounting hole on a boss pin or a receiving hole of a t... | 11/24/2009 |
| 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 head. A first dimension of the first magnetic read head is different ... | 07/21/2009 |
| 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 on a magnetic head, the quasi test being performed over 400 or more c... | 07/21/2009 |
| 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 of the sensed magnetic field to the desired value of the magnetic fie... | 06/23/2009 |
| 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 intermediate layer or a tunnel barrier layer sandwiched between the magnetiza... | 06/09/2009 |
| 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 are positioned above and below the plane of symmetry respectively. The... | 05/26/2009 |
| 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 when the head gimbal assembly is fixed in the mount, wherein the came... | 05/12/2009 |
| 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 includes: performing a magnetic write width test (on a plurality of di... | 04/28/2009 |
| 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 with axes the same as a current direction and an insulator filling betw... | 04/07/2009 |
| 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 the slider supported by the set plate and investigates the characteri... | 12/30/2008 |
| 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 magnetic read/write element, and a dual-stage positioning system that move... | 09/30/2008 |
| 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 conductor, the cross-section diameter being taken substantially perpen... | 09/16/2008 |
| 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 comprises the steps of: detecting amount of noises, which are included in ... | 08/26/2008 |
| 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 that could not be completely detected by conventional methods of testi... | 08/19/2008 |
| 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 slider mover that adjusts a head-to-disk spacing, controlling an elect... | 08/12/2008 |
| 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 includes a chip carrier with a magnetic layer on its carrier topside.... | 07/08/2008 |
| 7370404 | Method for resetting pinned layer magnetization in a magnetoresistive sensor A spin valve sensor in a read head has a spacer layer which is located between a self-pinned AP pinned layer structure and a free layer structure. The free layer structure is longitudinally stabilized by first and second hard bias layers which abut first and second ... | 05/13/2008 |
| 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 element of the slider. The micro pickup coil has highly repeatable and... | 05/06/2008 |
| 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 assessed. The rotator is operable in conjunction with said apparatus... | 04/29/2008 |
| 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 distance of an air gap is shortened, a slider head is held on a table ha... | 04/08/2008 |
