| Entries |
| Document | Title | Date |
|---|
| 20080198508 | MAGNETIC HEAD FOR PERPENDICULAR MAGNETIC RECORDING AND MAGNETIC DISK DRIVE - There is provided a perpendicular recording magnetic head that is able to improve further the magnetic characteristic in writing the magnetic data by magnetizing a magnetic recording medium in the perpendicular direction rather than the prior art. In a perpendicular recording magnetic head, a recording magnetic field output surface of a main pole, which emits a recording magnetic field generated by an exciting coil toward a magnetic recording medium in the perpendicular direction, has a trapezoid shape in which a base on a leading side is longer than a base on a trailing side and has a distribution of a saturation magnetic flux density which is reduced from the trailing side to the leading side, whereby this structure contributes an improvement of the recording density. | 08-21-2008 |
| 20080218902 | METHOD FOR MEASURING WIDTH OF PLATING LAYER, MAGNETIC RECORDING HEAD, AND MANUFACTURING METHOD THEREOF - A magnetic head has a main magnetic pole made of at least a magnetic material and a coil. The main magnetic pole has a stop layer through an inorganic insulating layer on both sides of the main magnetic pole in the widthwise direction. The boundary between the main magnetic pole and the metal layer becomes clear by the intervention of the inorganic insulating layer when viewing the flattened pattern plane by a scanning electron microscope and measuring the width of the main magnetic pole as a core width. The measurement accuracy of the main magnetic pole width can be improved and reductions in manufacturing yield rates which occur due to measurement errors can be prevented. | 09-11-2008 |
| 20080316648 | Nanocryalline structured co-based alloy intermediate layer (IL) replacing ru layer in perpendicular magnetic recording media for hard disk drive - A disk for a hard disk drive. The disk includes a first magnetic layer and a second magnetic layer. An intermediate layer consisting of cobalt and titanium is located between the first and second intermediate layers. The intermediate layer creates a finer grain size and larger crystalline anisotropy in the second magnetic layer, characteristics that are desirable when used with a perpendicular recording head. | 12-25-2008 |
| 20090002884 | Magnetic head for perpendicular magnetic recording and method of manufacturing same - An encasing section that accommodates a pole layer includes an encasing layer having an encasing groove, and a nonmagnetic film disposed in the encasing groove at a position between the encasing layer and the pole layer. The pole layer includes a track width defining portion and a wide portion. The distance from a medium facing surface to the boundary between the track width defining portion and the wide portion is within a range of 10 to 300 nm. The track width defining portion has a first side surface and a second side surface, while the wide portion has a third side surface contiguous to the first side surface, and a fourth side surface contiguous to the second side surface. The encasing layer has a first wall surface and a second wall surface that form the encasing groove. The distance between the third side surface and the first wall surface is smaller than the distance between the first side surface and the first wall surface, and the distance between the fourth side surface and the second wall surface is smaller than the distance between the second side surface and the second wall surface. | 01-01-2009 |
| 20090002885 | PERPENDICULAR MAGNETIC RECORDING HEAD AND METHOD OF MANUFACTURING THE SAME - Provided are a perpendicular magnetic recording (PMR) head and a method of manufacturing the same. The PMR head includes a main pole, a return yoke, and a coil to which current is supplied so that the main pole generates a magnetic field required for recording data in a recording medium. The PMR head further includes side shields disposed on both sides of the main pole to be spaced a first gap apart from the main pole; and a top shield disposed opposite the main pole and the side shields to be spaced a second gap apart from the main pole and the side shields at one end of the return yoke. | 01-01-2009 |
| 20090034121 | Magnetic head for perpendicular magnetic recording with coil wound around pole layer - A magnetic head includes a medium facing surface, a coil, and a pole layer that generates a write magnetic field. The pole layer includes: a track width defining portion having a first end located in the medium facing surface and a second end opposite to the first end; and a wide portion connected to the second end. The first end defines the track width. The track width defining portion has a width taken in the track width direction, and the wide portion has a width taken in the track width direction that is greater than the width of the track width defining portion taken in the track width direction. The coil is helically wound only around the track width defining portion of the pole layer, and has a portion located between the medium facing surface and the wide portion. | 02-05-2009 |
| 20090059426 | Magnetic head for perpendicular magnetic recording and method of manufacturing same - A top surface of a pole layer of a magnetic head includes: a first portion having a first edge located in a medium facing surface and a second edge opposite thereto; and a second portion located farther from the medium facing surface than the first portion and connected to the first portion at the second edge. The distance from a substrate to an arbitrary point on the first portion increases with increasing distance from the medium facing surface to the arbitrary point. The angle of inclination of the first portion taken at the arbitrary point with respect to a direction perpendicular to the medium facing surface increases stepwise or continuously with increasing distance from the medium facing surface to the arbitrary point. The angle of inclination taken at the first edge is greater than zero degree. The second portion extends in a direction substantially perpendicular to the medium facing surface. | 03-05-2009 |
| 20090080110 | PERPENDICULAR RECORDING MAGNETIC MEDIA WITH IMBALANCED MAGNETIC MOMENT MULTILAYER CAP STRUCTURE - A perpendicular magnetic recording media is provided having an imbalanced magnetic moment multilayer cap. The perpendicular magnetic recording media comprises a granular layer, and a multilayer cap structure exchange coupled to the granular layer. The multilayer cap structure includes upper and lower magnetic layers separated by a non-magnetic layer, where the upper magnetic layer has a magnetic moment greater than the lower magnetic layer. When an external field is applied to the recording media, a larger moment torque is triggered at the surface, and more efficient switching is facilitated. The upper magnetic layer may have a higher magnetic moment than the lower magnetic layer if the upper magnetic layer comprises a larger magnetic moment material than the lower magnetic layer. The upper magnetic layer may also have a higher magnetic moment than the lower magnetic layer if the upper magnetic layer has a greater thickness than the lower magnetic layer. | 03-26-2009 |
| 20090097158 | PERPENDICULAR MAGNETIC WRITE HEAD WITH DUAL PANCAKE WRITE COILS - A method for manufacturing a magnetic write head for perpendicular magnetic data recording. The method allows an upper write coil to be formed directly on a conformally deposited layer of non-magnetic material such as alumina which has been deposited over a magnetic shaping layer and write pole. The method allows the write coil to be constructed without the need for the deposition of a thick alumina fill layer and subsequent chemical mechanical polishing. This, therefore, avoids the necessity of such a chemical mechanical polishing step. | 04-16-2009 |
| 20090103210 | Apparatus and method for sensing an external magnetic field to protect a perpendicular magnetic recording (PMR) hard disk drive - A hard disk drive is disclosed including a voice coil motor and a magnetic sensor communicating with a control circuit. A magnetic sensor reading is created and used to stop access operations in response to the reading of an external magnetic field that may be strong enough to disrupt a slider accessing a rotating disk surface. Also disclosed are a main flex circuit and head stack assembly including the magnetic sensor for use in a hard disk drive. Control circuits and processors are disclosed for receiving the magnetic reading to stop access operations in hard disk drives. The hard disk drive may be a Perpendicular Magnetic Recording (PMR) hard disk drive. | 04-23-2009 |
| 20090116145 | Perpendicular shield pole writer with tapered main pole and tapered non-magnetic top shaping layer - A PMR writer with a tapered main pole layer and tapered non-magnetic top-shaping layer is disclosed that minimizes trailing shield saturation. A second non-magnetic top shaping layer may be employed to reduce the effective TH size while the bulk of the trailing shield is thicker to allow a larger process window for back end processing. A sloped surface with one end at the ABS and a second end 0.05 to 0.3 microns from the ABS is formed at a 10 to 80 degree angle to the ABS and includes a sloped surface on the upper portion of the main pole layer and on the non-magnetic top shaping layer. An end is formed on the second non-magnetic top shaping layer at the second end of the sloped surface followed by forming a conformal write gap layer and then depositing the trailing shield on the write gap layer and along the ABS. | 05-07-2009 |
| 20090128952 | MAGNETIC HEAD, HEAD ASSEMBLY AND MAGNETIC RECORDING/REPRODUCING APPARATUS - The present invention relates to a perpendicular recording magnetic head. A main magnetic pole film includes an electrode film and a plated magnetic film. The electrode film includes a Ru film and a conductive magnetic film, and the Ru film, which follows the shape of an inner wall surface of a recess formed in a first non-magnetic film, is adhered to the inner wall surface of the recess or a surface of a second non-magnetic film adhered thereto. The conductive magnetic film is adhered to a surface of the Ru film, thereby following the shape of the inner wall surface of the recess. The plated magnetic film is disposed adjacent the conductive magnetic film, thereby filling up the recess. | 05-21-2009 |
| 20090128953 | PERPENDICULAR MAGNETIC WRITE HEAD WITH STITCHED NOTCHED TRAILING SHIELD - A magnetic write head for perpendicular magnetic recording having a stitched notched trailing shield. The trailing shield includes a first pedestal portion having sides that are self aligned with the sides of the write pole and having a back edge that extends a first shield throat height. The shield further includes a second shield portion stitched onto the pedestal portion, the second shield portion having a back edge that extends beyond the back edge of the pedestal portion. | 05-21-2009 |
| 20090147401 | MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING/REPRODUCING APPARATUS - The present invention provides a magnetic recording medium capable of recording or reproducing high-density information by reducing the grain size of a perpendicular magnetic recording layer and improving vertical orientation, a method of manufacturing the same, and a magnetic recording/reproducing apparatus. The perpendicular magnetic recording medium includes: a non-magnetic substrate; and at least an soft magnetic layer, an under layer, an intermediate layer, and a perpendicular magnetic recording film that are formed on the non-magnetic substrate. At least one layer of the intermediate layer is made of an alloy material of an element having an fcc structure and an element having a bcc structure or an hcp structure, and has both a crystal structure having (111) orientation and an irregular layer lattice (stacking fault) caused by a mixture of the fcc structure and the bcc structure. The at least one layer of the intermediate layer is made of an alloy material of at least one element that is selected from a group composed of Pt, Ir, Pd, Au, Ni, and Co, which is a main ingredient, and has the fcc structure, and an element having the bcc structure or the hcp structure. | 06-11-2009 |
| 20090168240 | PERPENDICULAR WRITE HEAD HAVING A MODIFIED WRAP-AROUND SHIELD TO IMPROVE OVERWRITE, ADJACENT TRACK INTERFERENCE AND MAGNETIC CORE WIDTH DEPENDENCE ON SKEW ANGLE - A magnetic write head for perpendicular magnetic data recording. The write head includes an wrap around trailing shield structure for improved write field strength, reduced skew related adjacent track interference and magnetic core width. The trailing wrap around shield includes a side shield that is separated from sides of the write pole by a side gap that is narrower near the leading edge of the write pole and wider near the trailing edge of the write pole. | 07-02-2009 |
| 20090257147 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING APPARATUS - A disclosed perpendicular magnetic recording medium includes a substrate; a soft magnetic underlayer disposed on the substrate and having no remanent magnetization; and a ferromagnetic recording layer disposed on the soft magnetic underlayer. The soft magnetic underlayer includes at least three soft magnetic layers laid one above the other with a non-magnetic intermediate layer interposed between every two adjacent soft magnetic layers. Among the (at least) three soft magnetic layers, at least one pair of soft magnetic layers form ferromagnetic coupling. Among the (at least) three soft magnetic layers, at least one pair of soft magnetic layers form antiferromagnetic coupling. | 10-15-2009 |
| 20090290256 | 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 | 11-26-2009 |
| 20100061015 | MAGNETIC DISK DEVICE AND MAGNETIC HEAD - A magnetic disk device includes: a magnetic disk that includes a magnetic recording layer exhibiting Ising ferromagnetism; a recording magnetic pole that includes a pair of tip magnetic poles that apply a recording magnetic field to an area of the magnetic recording layer; and an auxiliary magnetic pole that includes a pair of tip magnetic poles that apply an auxiliary magnetic field that intersects with the recording magnetic field to the area where the recording magnetic field is applied, wherein the recording magnetic field is applied to the area while the auxiliary magnetic field is applied to the area. | 03-11-2010 |
| 20100128391 | Perpendicular Recording Media Having an Exchange-Spring Structure - A recording medium providing improved writeability in perpendicular recording applications includes a magnetic recording layer having an axis of magnetic anisotropy substantially perpendicular to the surface thereof, an exchange-spring layer ferromagnetically exchange coupled to the magnetic recording layer and having a coercivity less than the magnetic recording layer coercivity, and a coupling layer between the magnetic recording layer and the exchange-spring layer. The coupling layer regulates the ferromagnetic exchange coupling between the magnetic recording layer and the exchange-spring layer. | 05-27-2010 |
| 20100157473 | MAGNETIC DISK DRIVE - According to one embodiment, a magnetic disk drive includes a magnetic disk including a magnetic recording layer exhibiting perpendicular magnetic anisotropy, a write head including a core including a main pole and a plurality of return poles in a track direction and a direction other than the track direction with respect to the main pole, and a coil wound around corresponding to each return pole, and a read head including a magnetoresistive element and a pair of shields sandwiching the magnetoresistive element from front and rear in the track direction. | 06-24-2010 |
| 20100246061 | Shielded Perpendicular Magnetic Recording Head - A magnetic recording head for perpendicular magnetic recording includes energizing means, a recording pole, and a return pole. The recording pole narrows to a tip region with leading and trailing write edges separated by first and second side edges. The tip region provides a low reluctance path for magnetic flux generated by the energizing means. The return pole has a shield flare projecting towards the trailing write edge. A gap separates a leading edge of the shield flare from the trailing write edge. The shield flare diverts magnetic flux from reaching the tip region, thereby shielding the recording medium beneath the shield flare from the magnetic field while the side edges of the tip region and the recording medium beneath the gap are unshielded. A rear flare smoothes the discontinuity at the trailing edge of the return pole, thus reducing the peak magnetic field under the return pole. | 09-30-2010 |
| 20100321825 | MAGNETIC WRITER WITH MULTI-COMPONENT SHIELF - A writer comprises a main pole, a write gap and a write shield. The main pole has a main pole tip for emitting magnetic flux. The write gap is adjacent the main pole tip along a center axis of the writer. The write shield is spaced from the main pole tip by the write gap. The write shield comprises a first component located above the main pole tip along the center axis and a second component having different magnetic properties from the first component. The second component extends perpendicularly to the center axis from opposing sides of the first component. | 12-23-2010 |
| 20110026161 | PARTIALLY-OXIDIZED CAP LAYER FOR HARD DISK DRIVE MAGNETIC MEDIA - A perpendicular recording magnetic media with a partially-oxidized cap layer combines a second oxide layer with a first cap layer to form the singular, partially-oxidized cap. The oxidized portion and the non-oxidized portion of the partially-oxidized layer are sputtered from a same target and have a same composition of metallic elements. The Ms of the oxidized portion is about twice as high as the non-oxidized portion. The oxidized portion has a thickness in the range of about 5 to 25 angstroms. The layer composition may comprise CoPtCrBTa, with a Cr at % of about 18-24%, Pt at about 13-20%, B at about 4-10%, and Ta at about 0-2%. | 02-03-2011 |
| 20110273799 | NANOMETER SCALE MAGNETIZATION - Magnetic heads for perpendicular magnetic recording on magnetic recording media are provided. | 11-10-2011 |
| 20130135772 | METHOD FOR MANUFACTURING A MAGNETIC SENSOR USING TWO STEP ION MILLING - A method for manufacturing a magnetic sensor that includes depositing a plurality of mask layers, then forming a stripe height defining mask over the sensor layers. A first ion milling is performed just sufficiently to remove portions of the free layer that are not protected by the stripe height defining mask, the first ion milling being terminated at the non-magnetic barrier or spacer layer. A dielectric layer is then deposited, preferably by ion beam deposition. A second ion milling is then performed to remove portions of the pinned layer structure that are not protected by the mask, the free layer being protected during the second ion milling by the dielectric layer. | 05-30-2013 |
| 20150049401 | PERPENDICULAR TIMING-BASED SERVO HEADS - A perpendicular recording head and tape having some perpendicular component of magnetization are provided. The perpendicular recording head may contain at least two non-parallel poles such that each set of such poles may form the writing poles for recording a timing based servo band onto the tape medium. | 02-19-2015 |
| 20160078888 | UNDERLAYER FOR REFERENCE LAYER OF POLYCRYSTALLINE CPP GMR SENSOR STACK - Embodiments disclosed herein generally relate to a magnetic head having an amorphous ferromagnetic reference layer. The ferromagnetic reference layer may have amorphous structure as a result of an amorphous ferromagnetic underlayer that the ferromagnetic reference layer is deposited thereon. The amorphous ferromagnetic reference layer enhances magnetoresistance, leading to an improved magnetic head. | 03-17-2016 |
| 20160148633 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS - A perpendicular magnetic recording medium includes a perpendicular magnetic layer provided above a nonmagnetic substrate, and a protection layer provided on the perpendicular magnetic layer. The perpendicular magnetic layer has an hcp structure, and includes stacked layers having a (0002) crystal plane oriented parallel to a surface of the nonmagnetic substrate. An uppermost layer amongst the stacked layers includes polycrystal grains selected from a CoCr-base alloy, a CoPt-base alloy, a CoCrPt-base alloy, and a CoPtCr-base alloy. The protection layer makes contact with the uppermost layer of the perpendicular magnetic layer, and includes a single graphene layer or a graphene stack, and an amorphous carbon layer. The single graphene layer or the graphene stack is bonded in parallel to a (0002) crystal plane of the polycrystal grains. | 05-26-2016 |
