| HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B. V. Patent applications |
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| 20120127603 | MAGNETIC TUNNEL JUNCTION HAVING A MAGNETIC INSERTION LAYER AND METHODS OF PRODUCING THE SAME - According to one embodiment, a magnetic head includes a barrier layer having a crystalline structure, a first magnetic layer above the barrier layer, a magnetic insertion layer above the first magnetic layer, and a second magnetic layer above the magnetic insertion layer, the second magnetic layer having a textured face-centered cubic (fcc) structure. The first magnetic layer comprises a high spin polarization magnetic material having a crystalline structure and a characteristic of crystallization being more similar to the crystalline structure of the barrier layer than a crystalline structure of the second magnetic layer and the magnetic insertion layer comprises a magnetic material having a crystalline structure and a characteristic of crystallization being more similar to the crystalline structure of the second magnetic layer than the crystalline structure of the barrier layer. Additional magnetic head structures and methods of producing magnetic heads are described according to more embodiments. | 05-24-2012 |
| 20120125884 | METHOD FOR MANUFACTURING A NARROW MAGNETIC READ WIDTH CURRENT PERPENDICULAR TO PLANE MAGNETORESISTIVE SENSOR - A method for manufacturing a magnetic read head having a very narrow track width. The method includes the use of a non-Si containing photoresist to form a mask prior to ion milling to define the track-width of the sensor. Previously only Si-containing resists were used. The Si in the resist turned to an oxide, which allowed the photoresist to withstand the reactive ion etching used for image transfer to an underlying hard mask. The Si-containing resist, however, has limitations as to how small the mask can be made. It has been found that a non-Si-containing resist provides better resolution at very narrow track-width definition, and also provides good temperature resistance. Some modifications to the process allow the non-Si-containing resist to be used in the construction of the magnetic read sensor. | 05-24-2012 |
| 20120106006 | MAGNETIC SENSOR HAVING IMPROVED RESISTANCE TO THERMAL STRESS INDUCED INSTABILITY - A magnetic read sensor having improved robustness to withstand thermal variations resulting from thermal fly height heating. Improved thermal robustness comes as a result of improved pinned layer pinning. The read head includes an AFM layer having an increased thickness to provide a higher blocking temperature. The read head further includes a pinned layer structure that includes a first magnetic layer adjacent to and exchange coupled with the AFM layer. The first layer comprises a Co—Fe layer with an increased Fe content of 20-30 atomic percent. The pinned layer structure also includes a second magnetic layer that is antiparallel coupled with the AP | 05-03-2012 |
| 20120099220 | PERPENDICULAR MAGNETIC RECORDING MEDIUM (PMRM) AND SYSTEMS THEREOF - In one embodiment, a perpendicular magnetic recording medium includes a crystalline seed layer having a pseudo-hcp structure with stacking faults formed above a soft magnetic underlayer, a first interlayer comprising Ru and one of W, Ta, Mo, and Nb formed above the crystalline seed layer, a second interlayer formed above the first interlayer, and a magnetic recording layer formed above the second interlayer. The first interlayer has a W concentration between about 32 at % and 50 at %, Mo in a concentration between about 36 at % and 52 at %, Ta in a concentration between about 20 at % and 30 at %, or Nb in a concentration between about 7 at % and 30 at %. In another embodiment, a system includes a recording medium as described above, a magnetic head for reading from and/or writing to the medium, a head slider for supporting the head, and a control unit coupled to the head. | 04-26-2012 |
| 20120069472 | CURRENT-PERPENDICULAR-TO-PLANE (CPP) READ SENSOR WITH FERROMAGNETIC BUFFER AND SEED LAYERS - A current-perpendicular-to-plane (CPP) tunneling magnetoresistance (TMR) or giant magnetoresistance (GMR) read sensor with ferromagnetic buffer and seed layers is proposed for high-resolution magnetic recording. The ferromagnetic buffer layer is preferably formed of an amorphous Co—X (where X is Hf, Y, Zr, etc.) film. It provides the CPP read sensor with microstructural discontinuity from a ferromagnetic lower shield, thus facilitating the CPP read sensor to grow freely with preferred crystalline textures, and with ferromagnetic continuity to the ferromagnetic lower shield, thus acting as a portion of the ferromagnetic lower shield. The ferromagnetic seed layer is preferably formed of a polycrystalline Ni—X (where X is Pt, Pd, Rh, Ru, etc.) film. It exhibits a face-centered-cubic (fcc) structure and does not exchange-couple with the antiferromagnetic pinning layer. It provides the CPP read sensor with microstructural continuity, thus facilitating the CPP read sensor to grow with preferred crystalline textures and exhibiting good magnetic and TMR properties, and with ferromagnetic continuity to the ferromagnetic lower shield, thus also acting as another portion of the ferromagnetic lower shield and defining the lower bound of a read gap with its upper surface. | 03-22-2012 |
| 20120064375 | METHOD FOR MANUFACTURING A PERPENDICULAR MAGNETIC DATA RECORDING MEDIA HAVING A PSEUDO ONSET LAYER - A method for manufacturing a magnetic media for perpendicular magnetic data recording. The method includes depositing a Ru layer in a pure oxygen atmosphere and then further depositing Ru in the presence of oxygen to form a thin pseudo onset layer. The pseudo onset layer can advantageously be depositing in the same deposition chamber and using the same target as that used to deposit the underlying Ru layer. This saves a great deal of manufacturing cost and complexity. The presence of the pseudo onset layer reduces grains size and increases grain separation in a high Ku magnetic layer deposited thereon, thereby increasing signal to noise ratio and decreasing magnetic core width (MCW). | 03-15-2012 |
| 20110141615 | MAGNETIC HEAD FOR PERPENDICULAR RECORDING - According to one embodiment, a magnetic head for perpendicular recording includes a main pole, a first soft magnetic film disposed on a trailing side of the main pole, and a first nonmagnetic film interposed between the main pole and the first soft magnetic film. A thickness of the main pole is increased in a depth direction from an air bearing surface using an inclination, and a thickness of the first nonmagnetic film increases in the depth direction from the air bearing surface. In another embodiment, an angle from a horizontal plane of an upper surface of the first nonmagnetic film is greater than an angle from a horizontal plane of a lower surface of the first nonmagnetic film in contact with the main pole. Other heads, methods, and systems are described according to more embodiments. | 06-16-2011 |
| 20110141613 | TUNNELING MAGNETORESISTANCE READ HEAD HAVING A COFE INTERFACE LAYER AND METHODS FOR PRODUCING THE SAME - According to one embodiment, a method for producing a Tunneling Magnetoresistance (TMR) read head includes forming a fixed layer, forming an insulating barrier layer above the fixed layer, forming a free layer above the insulating barrier layer, and annealing the free layer, the fixed layer, and the insulating barrier layer. The fixed layer includes a first ferromagnetic layer having a Co | 06-16-2011 |
| 20100091408 | HARD DISK DRIVE WITH DISK SEPARATOR FOR CREATING AXIAL GAPS BETWEEN DISKS FOR ACCESS BY READ/WRITE HEADS - A hard disk drive (HDD) has a stack of disks mounted on a rotatable spindle with the disks being movable axially, i.e., in a direction parallel to the axis of rotation of the spindle. A disk separator is located inside the spindle and separates axially-adjacent disks in a pair to create an axial gap. Any pair of axially-adjacent disks can be separated so that different axial gaps are created. A single head-arm assembly with at least one and preferably two read write heads is movable axially so that it can be rotated by the rotary actuator into any one of the axial gaps. The read/write heads can thus access data on the disk surfaces in the axial gaps. When it is desired to have the disk separator create an new axial gap and thus a new pair of disk surfaces to be accessed, the actuator rotates the head-arm assembly away from the outer perimeters of the disks and moves the read/write heads onto a head support structure that supports the read/write heads off the disks. | 04-15-2010 |
| 20100011182 | Techniques For Scheduling Requests For Accessing Storage Devices Using Sliding Windows - A system includes a storage device and a scheduler. The scheduler determines if deadlines of requests for accessing the storage device fall within first and second sliding windows. The scheduler issues requests that are in the first sliding window in a first order of execution and requests that are in the second sliding window in a second order of execution. | 01-14-2010 |
| 20090258186 | WAFER-LEVEL METHOD FOR FABRICATING AN OPTICAL CHANNEL AND APERTURE STRUCTURE IN MAGNETIC RECORDING HEAD SLIDERS FOR USE IN THERMALLY-ASSISTED RECORDING (TAR) - A process for forming a plurality of sliders for use in thermally-assisted recording (TAR) disk drives includes a wafer-level process for forming a plurality of aperture structures, and optionally abutting optical channels, on a wafer surface prior to cutting the wafer into individual sliders. The wafer has a generally planar surface arranged into a plurality of rectangularly-shaped regions. In each rectangular region a first metal layer is deposited on the wafer surface, followed by a layer of radiation-transmissive aperture material, which is then lithographically patterned to define the width of the aperture, the aperture width being parallel to the length of the rectangularly-shaped region. A second metal layer is deposited over the patterned layer of aperture material. The resulting structure is then lithographically patterned to define an aperture structure comprising aperture material surrounded by metal and having parallel radiation entrance and exit faces orthogonal to the wafer surface. | 10-15-2009 |
| 20090216943 | Data storage device and data management method in data storage device - Embodiments of the present invention improve efficiency in saving log data in a hard disk drive (HDD) equipped with a magnetic disk and a flash memory,. In an aspect of one embodiment of the present invention, a HDD creates a segment table to associate an address of user data in a flash memory with an LBA in a magnetic disk. The HDD updates the segment table in a DRAM and saves it to the flash memory at a specific timing. The HDD creates journals indicating the update of the segment table and saves it to the flash memory. The latest segment table can be restored using the segment table and the journals in the flash memory. | 08-27-2009 |
| 20090118850 | Transportation control method and transportation control system - Embodiments of the present invention provide a workpiece transportation control method and system that automatically processes a plurality of steps in a successive manner, thereby enhancing production efficiency. According to one embodiment, a transportation control method includes the steps of: monitoring the state of an automated manufacturing system to see if there is a request for transporting a workpiece; extracting the subsequent step path for the workpiece when a transportation request is issued; calculating a standard necessary period along the extracted step path; converting the subsequent standard necessary period into an evaluation value, issuing a transportation request, stacking tasks in response to other transportation requests; and selecting a workpiece with the shortest subsequent standard necessary period from the stacked transportation requests. | 05-07-2009 |
| 20080261078 | PERPENDICULAR MAGNETIC RECORDING EXCHANGE-SPRING TYPE MEDIUM WITH A LATERAL COUPLING LAYER FOR INCREASING INTERGRANULAR EXCHANGE COUPLING IN THE LOWER MAGNETIC LAYER - A perpendicular magnetic recording system and medium has a multilayered recording layer that includes an exchange-spring structure and a ferromagnetic lateral coupling layer (LCL). The exchange-spring structure is made up of two ferromagnetically exchange-coupled magnetic layers (MAG | 10-23-2008 |
