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| Number | Title | Issue Date |
| 7898777 | Detection of magnetic beads using a magnetoresistive device together with ferromagnetic resonance A method and apparatus for detecting the presence of magnetic beads is disclosed. By providing both a static magnetic field and a magnetic field that alternates in the MHz range, or beyond, the bead can be excited into FMR (ferromagnetic resonance). The appearance o... | 03/01/2011 |
| 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 |
| 7284316 | Method for forming a hard bias structure in a magnetoresistive sensor A method for forming a hard bias structure in a magnetoresistive sensor is disclosed. A magnetoresistive sensor having a soft magnetic bias layer, spacer layer, and a magnetoresistive layer, is formed over a substrate having a gap layer. A mask is formed over a port... | 10/23/2007 |
| 7268985 | Magnetic head having a layered hard bias layer exhibiting reduced noise A magnetic head having an improved read head structure. The read head includes a free magnetic layer with hard bias elements disposed proximate its ends, where the hard bias elements include an improved hard bias magnetic grain structure. This is accomplished by fab... | 09/11/2007 |
| 7256970 | Elimination of electric-pop noise in MR/GMR device A magnetic reading head comprising: a bottom shield; a top shield; an AMR device with MR and SAL separated by a thin insulating layer; a first insulting gap layer between said bottom shield and said AMR; a second insulating gap layer between said AMR and said top sh... | 08/14/2007 |
| 7158356 | Elimination of electric-pop noise in a MR device The invention relates to a magnetic recording head comprising: a bottom shield; a top shield; and AMR device with MR and SAL separated by a thin insulating layer; a first insulting gap layer between said bottom shield and said AMR; a second insulating gap layer betw... | 01/02/2007 |
| 7154717 | Magnetoresistance effect film, magnetoresistance effect head and solid state memory The magnetoresistance effect film is capable of performing enough function without employing an antiferromagnetic layer. The film comprises: a seed layer; a first pinned magnetic layer formed on the seed layer; an antiferromagnetically coupling layer formed on the f... | 12/26/2006 |
| 7139156 | Non-penetration of periodic structure to PM A magnetoresistive read head having a corrugated magnetoresistive layer wherein the corrugated section does not encroach on magnetic elements on either end of the magnetoresistive layer. The corrugations in the magnetoresistive layer stabilize the magnetization in t... | 11/21/2006 |
| 7064936 | Magnetoresistance effect device A magnetoresistance effect device having a basic structure wherein a multi-layer film comprising a unit of magnetic layer/non-magnetic layer/magnetic layer/antiferromagnetic layer, or antiferromagnetic layer/magnetic layer/non-magnetic layer/magnetic layer is formed... | 06/20/2006 |
| 6937007 | Magnet field symmetry for hall sensor A method for balancing the flux density of a permanent magnet includes sensing flux density in a permanent magnet and if unbalanced relative to a physical center, adjusting the cross-sectional area and shape of the magnet by removing magnetic material from the magne... | 08/30/2005 |
| 6930862 | Shielded extraordinary magnetoresistance head An extraordinary magnetoresistance (EMR) magnetic head is provided including a first shield and a second shield defining a gap adapted for being positioned over a magnetic recording disk. An EMR sensor is positioned between the first shield and the second shield. In... | 08/16/2005 |
| 6717780 | Magnetoresistive device and/or multi-magnetoresistive device A magneto-resistive element includes a vertical current type magneto-resistive element; a first conductor for causing a current to flow into the vertical current type magneto-resistive element; and a second conductor for causing the current to flow out of the vertic... | 04/06/2004 |
| 6282067 | Magnetic reproducing head having a magnetoresistive effect A magnetoresistive effect element 5 is physically configured such that the element width is at least three times as large as the element height. A plurality of domain control layers 11 to 13 are located between the magnetoresistive effect element 5 and a ... | 08/28/2001 |
| 6137663 | Magnetic head and method for magnetic recording and playback A magnetoresistive effect type magnetic head has a magnetoresistive effect (magnetoresistive effect film) and a soft adjacent layer (SAL) that is disposed in opposition to the magnetoresistive effect film via an intervening non-magnetic film, for the purp... | 10/24/2000 |
| 6111730 | Dual layer magnetic exchange stabilization for MR heads A magnetoresistive (MR) head (100) for use in a data storage system includes an MR sensor layer (170) and a soft adjacent layer (SAL) (120) disposed along a length of the MR sensor layer and adapted to vertically bias the MR sensor layer. A spacer layer (... | 08/29/2000 |
| 5946169 | Soft adjacent layer vertically biased magnetoresistive sensor having improved sensor stability A soft adjacent layer (SAL) vertically biased magnetoresistive (MR) sensor is disclosed. The SAL biased sensor includes at least three permanent magnet (PM) tabs (hereafter referred to as tabs). An MR sensor layer is disposed in relation to the tabs such ... | 08/31/1999 |
| 5923503 | Thin-film magnetic head and production method thereof A longitudinal bias layer and an electrode layer are formed on a non-magnetic material layer. The longitudinal bias layer and the electrode layer are partially removed by an etching technique so that a narrow gap defining the track width Tw is formed in t... | 07/13/1999 |
| 5892641 | Magnetoresistive effect head with individual layers satisfying a basic inequality involving layer thickness and ion milling rates A central region susceptible to medium magnetic field is formed. End regions (13 to 15) sandwich and extend from the ends of the central region, and apply a vertical bias to the central region. These regions are formed on a substrate (1 to 5). The central... | 04/06/1999 |
| 5715120 | Magnetoresistance sensor with enhanced magnetoresistive effect A magnetoresistive (MR) sensor having end regions separated from each other by a central region. Hard bias layers disposed in the end regions longitudinally bias an MR layer which is formed in the central region. A soft adjacent layer (SAL) is utilized to... | 02/03/1998 |
| 5646805 | Magnetoresistive read transducer with partially abutted junctions A magnetoresistive transducer is formed with a trilayer structure including a soft adjacent magnetic layer (SAL), a spacer layer and a magnetoresistive (MR) sensor element. The SAL and part of the spacer layer extend continuously across the transducer str... | 07/08/1997 |
| 5581427 | Peak enhanced magnetoresistive read transducer An MR read transducer is provided which has a central region located between a pair of end regions. The central region and the pair of end regions extend along a width of the MR read transducer. An MR layer extends along the width of the MR read transduce... | 12/03/1996 |
| 5556718 | Magnetoresistive head In a magnetoresistive effect head comprising a ferromagnetic magnetoresistive effect layer, an inverse ferromagnetic layer (3) for generating a longitudinal bias magnetic field by an exchange force with respect to the ferromagnetic magnetoresistive effect... | 09/17/1996 |
| 5436777 | Magnetoresistive head A magnetoresistive head has a substrate (1) and, on the substrate, a magnetoresistive film (40) for converting a magnetic signal into an electric signal by using magnetoresistance effects and a pair of electrodes (60) for causing a signal detection curren... | 07/25/1995 |
| 5412518 | Individual MR transducer head/disk/channel adaptive bias current system A method and apparatus is disclosed for adaptively controlling the biasing current applied to magnetoresistive (MR) read heads within a magnetic disk drive to provide optimized bias for each head/disk/channel component combination. An optimized bias curre... | 05/02/1995 |
| 5381291 | Vertical contact - canted magnet magnetoresistive sensor A magnetoresistive sensor has an air bearing surface, first and second vertical contacts having contact edges generally perpendicular to the air bearing surface, a generally rectangular magnetoresistive region having a first edge that comprises part of th... | 01/10/1995 |
| 5325253 | Stabilization of magnetoresistive transducer using canted exchange bias A magnetoresistive (MR) read transducer and method of fabricating same. A soft magnetic layer and an MR layer extend over a central active region and passive end regions of the transducer. A nonmagnetic spacer layer separates the soft magnetic film layer ... | 06/28/1994 |
| 5285339 | Magnetoresistive read transducer having improved bias profile An MR read transducer having passive end regions separated by a central active region comprises an MR layer made from a material having a low uniaxial magnetic anisotropy. A soft magnetic bias layer is adjacent to but spaced from the MR layer in the centr... | 02/08/1994 |
| 5081554 | Biasing conductor for MR head A combined transverse and longitudinal biasing conductor for MR element, and a thin film head including same.... | 01/14/1992 |
| 5021909 | Yoke type thin-film magnetic head and method for suppressing Barkhausen noise A yoke type thin-film magneto-resistive heat includes a magneto-resistive element that detects the magnetic field generated in the magnetic recording medium as resistance changes, a yoke, that leads magnetic flux from the head gap to the above mentioned m... | 06/04/1991 |
| 4972284 | Deposited permanent magnet for hard and easy axes biasing of a magnetoresistive head A previously disclosed "C" shaped thin film deposited permanent magnetic structure of essentially symmetrical form is designed to provide a planar region of transverse field with little or no longitudinal field component. Practice of the present invention... | 11/20/1990 |
| 4928188 | Magnetoresistive element sandwiched between a sal ferrite substrateand a cover containing an easy axis biasing magnet A magnetoresistive head is fabricated on a ferrite substrate which is both the mechanical support for the head assembly and a soft adjacent layer for biasing the magnetoresistive element of the head. Easy axis bias is supplied by a fixed magnet located in... | 05/22/1990 |
| 4899240 | Biasing for a UMR head Both hard and easy axis bias fields are applied to the sense film of an unshielded magnetoresistive (UMR) magnetic head by a single bias source. The easy and hard axis fields are applied to the UMR sense film by so angling the applied bias field that orth... | 02/06/1990 |
| 4800457 | Magnetoresistive sensor element A magnetoresistive sensor which includes an element having a first layer that exhibits a magnetoresistive response, a second layer that magnetically biases the first layer and is in contact therewith, and possibly a substrate that contacts the first layer... | 01/24/1989 |
| 4771349 | Magnetoresistive read transducer A magnetoresistive (MR) read transducer assembly in which the thin film MR layer is longitudinally biased directly only in the end regions by exchange bias developed by a thin film of antiferromagnetic material that is deposited in direct contact only in ... | 09/13/1988 |
| 4649447 | Combed MR sensor A magnetic head assembly includes a magnetoresistive (MR) element for reading magnetically recorded information from a record medium. The MR element comprises an elongated member having a predetermined height and a plurality of elongated attachments which... | 03/10/1987 |
| 4623867 | Permanent magnet biased narrow track magnetoresistive transducer A narrow track magnetoresistive transducer has a square shaped bias permanent magnet superposed with an MR element. The square shaped magnet provides bias field components of substantially the same magnitude in both hard and easy axis directions of the MR... | 11/18/1986 |
| 4524401 | Magnetic transducer head utilizing magneto resistance effect with a bias field and partial saturation A magnetic transducer head utilizing a thin film magneto-resistance effect element is disclosed in which the amount of a DC bias magnetic field is so selected that only the end portion of the thin film magneto-resistance effect element serving as a contac... | 06/18/1985 |
