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| Number | Title | Issue Date |
| 7835118 | 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... | 11/16/2010 |
| 7372673 | Magnetoresistive effect transducer having longitudinal bias layer and control layer directly connected to free layer In a magnetoresistive effect transducer including a pinning layer, a pinned layer, a free layer and a non-magnetic layer inserted between the pinned layer and the free layer, a longitudinal bias layer is connected directly to a part of the free layer to apply a bias... | 05/13/2008 |
| 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 |
| 7365408 | Structure for photolithographic applications using a multi-layer anti-reflection coating A bi-layer anti-reflective coating for use in photolithographic applications, and specifically, for use in ultraviolet photolithographic processes. The bi-layered anti-reflective coating is used to minimize pattern distortion due to reflections from neighboring feat... | 04/29/2008 |
| 7360302 | Manufacturing method of a magnetic sensor A magnetic sensor comprises magnetoresistive elements and permanent magnet films, which are combined together to form GMR elements formed on a quartz substrate having a square shape, wherein the permanent magnet films are paired and connected to both ends of the mag... | 04/22/2008 |
| 7362548 | Magnetic sensor and manufacturing method therefor A magnetic sensor comprises magnetoresistive elements and permanent magnet films, which are combined together to form GMR elements formed on a quartz substrate having a square shape, wherein the permanent magnet films are paired and connected to both ends of the mag... | 04/22/2008 |
| 7342752 | Magnetoresistive read head having a bias structure with at least one dusting layer A magnetoresistive read head includes a magnetoresistive sensor and a bias structure adjacent to the magnetoresistive sensor. The bias structure provides a magnetostatic bias field for the magnetoresistive sensor. The bias structure includes an underlayer, a bias la... | 03/11/2008 |
| 7336556 | Magnetic non-volatile memory device A non-volatile magnetic memory device is proposed, which provides sufficient magnetic shielding performance for external magnetic fields. A first magnetic shield layer 60a and a second magnetic shield layer 60b, both made of a soft magnet... | 02/26/2008 |
| 7333304 | CPP sensor having hard bias stabilization placed at back edge of the stripe A current perpendicular to plane (CPP) having hard magnetic bias layers located at the back of the sensor, opposite the air bearing surface. The bias layer is magnetostatically coupled with the free layer to bias the free layer in a desired direction parallel with t... | 02/19/2008 |
| 7333307 | Double layer longitudinal bias structure It is necessary to stabilize the free layer of GMR or TMR devices by providing a longitudinal bias field. As read tracks become very narrow, this field can drastically reduce the strength of the output signal. This problem has been overcome by adding an additional b... | 02/19/2008 |
| 7327540 | Hard biased materials for recording head applications A hard bias layer that forms an abutting junction with a free layer in a GMR element and is comprised of FePtCu or FePtCuX where X is B, C, O, Si, or N is disclosed. The FePtCu layer has a composition of about 45 atomic % Fe, 45 atomic % Pt, and 10 atomic % Cu and d... | 02/05/2008 |
| 7320170 | Xenon ion beam to improve track width definition Using a beam of xenon ions together with a suitable mask, a GMR stack is ion milled until a part of it, no more than about 0.1 microns thick, has been removed so that a pedestal, having sidewalls comprising a vertical section that includes all of the free layer, has... | 01/22/2008 |
| 7292400 | Device for limiting current in a sensor A read/write device for a disk drive is disclosed. The read/write device includes a pre-amplifier and a recording head. The read/write device also includes a write signal path between the pre-amplifier and the recording head. The write signal path includes a write c... | 11/06/2007 |
| 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 |
| 7236333 | Domain wall free shields of MR sensors A magnetic reader of the present invention comprises an MR sensor shielded by a magnetic shield including single domain soft magnetic materials. The domain wall free magnetic shield includes an unbiased soft magnetic layer and a biased soft magnetic layer separated ... | 06/26/2007 |
| 7228618 | Method for fabricating a magnetic head A magnetic head having a spin valve sensor that is fabricated utilizing an Al2O3, NiMn0, Si seed layer upon which a PtMn spin valve sensor layer structure is subsequently fabricated. In the preferred embodiment, the Si layer has a thickness of ... | 06/12/2007 |
| 7227726 | Method and system for providing a dual-stripe magnetoresistive element having periodic structure stabilization A dual-stripe element magnetroresistive read head for reading information from a magnetic tape. The read head includes a first insulating layer, a first active magnetoresistive layer formed on the first insulating layer, a second insulating layer formed on the first... | 06/05/2007 |
| 7209327 | Magnetoresistive head having magnetic domain control film in contact with underlayer and with ends of free layer A magnetic domain control underlayer is formed below a magnetoresistive multi-layered film thereby bringing the magnetic domain control film into contact with both lateral end faces of a free layer and appropriate magnetic domain control can be attained in a state o... | 04/24/2007 |
| 7203039 | Side reading reduced GMR for high track density As track density requirements for disk drives have grown more aggressive, GMR devices have been pushed to narrower track widths to match the track pitch of the drive width. Narrower track widths degrade stability, cause amplitude loss, due to the field originating f... | 04/10/2007 |
| 7199986 | Magnetoresistive sensor with decoupled hard bias multilayers A magnetic sensor is provided, having two bias layers separated by a decoupling layer to eliminate exchange coupling between the bias layers. The two bias layers may have differing coercivities, such that the biases provided by the bias layers to the free layer are ... | 04/03/2007 |
| 7170724 | Magnetic sensor and manufacturing method therefor A magnetic sensor comprises magnetoresistive elements and permanent magnet films, which are combined together to form GMR elements formed on a quartz substrate having a square shape, wherein the permanent magnet films are paired and connected to both ends of the mag... | 01/30/2007 |
| 7166173 | Method of simultaneously initializing two antiferromagnetic layers in a magnetic sensor Magnetic tunnel junction (MTJ) and charge perpendicular-to-plane (CPP) magnetic sensors are disclosed which have a first antiferromagnetic layer for pinning the magnetization direction in a pinned layer and a second antiferromagnetic layer for providing bias stabili... | 01/23/2007 |
| 7161763 | GMR sensor with oriented hard bias stabilization Magnetic data storage devices use read/write heads to transfer data between the magnetic storage medium and the rest of the system. The read head is constructed with a magnetic layer called a free layer whose magnetic axis rotates based upon external magnetic influe... | 01/09/2007 |
| 7155810 | Method for fabricating a magnetic head A GMR read head for a magnetic head, in which the hard bias layers are fabricated immediately next to the side edges of the free magnetic layer, and such that the midplane of the hard bias layer and the midplane of the free magnetic layer are approximately coplanar.... | 01/02/2007 |
| 7151654 | TMR head structure with conductive shunt The sensor of the present invention is a tunneling magnetoresistive read sensor that includes first and second electrodes, and a stack positioned between the electrodes. The stack includes at least one sense layer and a tunnel barrier. A shunt member is operatively ... | 12/19/2006 |
| 7149062 | Spin valve structure with Si seed layer and reduced PtMn antiferromagnetic layer thickness A magnetic head having a spin valve sensor that is fabricated utilizing an Al2O3, NiMn0, Si seed layer upon which a PtMn spin valve sensor layer structure is subsequently fabricated. In the preferred embodiment, the Si layer has a thickness of ... | 12/12/2006 |
| 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 |
| 7118814 | Apparatus and method for step-stabilization of GMR-based read sensors An apparatus and method for step-stabilization of giant magnetoresistive (GMR) based read heads are provided. With the apparatus and method, gratings or periodic structures are generated in the underlayer of the magnetoresistive (MR) sensor stack and the edges, or â... | 10/10/2006 |
| 7092220 | Apparatus for enhancing thermal stability, improving biasing and reducing damage from electrostatic discharge in self-pinned abutted junction heads having a first self-pinned layer extending under the hard bias layers A method and apparatus for enhancing thermal stability, improving biasing and reducing damage from electrical surges in self-pinned abutted junction heads. A first self-pinned layer having a first magnetic orientation is provided, wherein the first self-pinned layer... | 08/15/2006 |
| 7085109 | Spin valve type transducer capable of reducing reproducing gap In a spin value type transducer including two magnetic shield layers, a patterned magnetoresistance element is in direct contact with one of the magnetic shield layers. A permanent magnet layer and an electrode layer are formed on the sides of the patterned magnetor... | 08/01/2006 |
| 7085111 | Low resistance antiparallel tab magnetoresistive sensor A magnetoresistive sensor having bias stabilization tabs includes a protective cap layer. The protective cap layer prevents oxidation, avoids potential damage from using ion milling for oxidation removal, and lowers parasitic resistance. In one embodiment, a bias la... | 08/01/2006 |
| 7075761 | Lead-defined and shaped magnetic sensor A magnetic recording transducer, useful in a magnetic data storage device, having a read element with improved magnetic stability and a narrow track width is described. An MR stripe according to the invention has a magnetic-stability inducing (MSI) shape selected fr... | 07/11/2006 |
| 7072155 | Magnetoresistive sensor including magnetic domain control layers having high electric resistivity, magnetic head and magnetic disk apparatus A magnetoresistive sensor of the type of flowing a signal sensing current perpendicular to the plane, a magnetic head using the magnetoresistive sensor, and a magnetic disk apparatus, comprising a substrate, a pair of magnetic shield layers consisting of a lower mag... | 07/04/2006 |
| 7072156 | Method for biasing magnetoresistive sensor with decoupled hard bias multilayers A magnetic sensor is provided, having two bias layers separated by a decoupling layer to eliminate exchange coupling between the bias layers. The two bias layers may have differing coercivities, such that the biases provided by the bias layers to the free layer are ... | 07/04/2006 |
| 7072154 | Method and apparatus for providing a self-pinned bias layer that extends beyond the ends of the free layer A method and apparatus for enhancing thermal stability, improving biasing and reducing damage from electrical surges in self-pinned abutted junction heads. The head includes a free layer having a first end and a second end defining a width selected to form a desired... | 07/04/2006 |
| 7064939 | Hard bias layer for read heads A magnetoresistive (MR) read head is disclosed including an MR sensor having a free layer and a pinned layer. A multi-layer hard bias layer stabilizes the free layer of the MR sensor. A product of the moment (Ms) and the thickness (t) of a lower layer of the hard bi... | 06/20/2006 |
| 7064649 | Magneto-resistive layer arrangement and gradiometer with said layer arrangement A magnetoresistive layer system including a layer sequence including at least two magnetic layers, a non-magnetic, electrically conductive intermediate layer being arranged between them; the electrical resistance of the layer system being changeable as a function of... | 06/20/2006 |
| 7061725 | Magnetic read sensor with stripe width and stripe height control The present invention includes a magnetic sensing structure having a stripe height and a stripe width defining an area for a current flowing therethrough, and at least one electrode positioned adjacent an edge of the magnetic sensing structure for adjustably control... | 06/13/2006 |
| 7057863 | Anti-parallel tab sensor fabrication using chemical-mechanical polishing process A method for fabricating a sensor having anti-parallel tab regions. The method includes forming a free layer, and forming a first layer of a carbon composition above the active area of the free layer. A layer of resist is formed above the first layer of carbon compo... | 06/06/2006 |
