Patent application number | Description | Published |
20080239583 | Thin film magnetic head, head gimbal assembly, head arm assembly, magnetic disk device and method of forming thin film magnetic head - The thin film magnetic head includes a main magnetic pole layer conducting a magnetic flux to the recording medium so that the recording medium an be magnetized in a direction orthogonal to a surface thereof; a return yoke layer disposed on a trailing side of the main magnetic pole layer; an intermediate protective layer partially disposed on a magnetic shield layer; and a thermal expansion suppressing layer having an edge located on the intermediate protective layer and being in contact with the return yoke layer in an area where the intermediate protective layer is not formed. If the thin film magnetic head is affected by ambient temperature environment, the thermal expansion suppressing layer suppresses the shift of the main magnetic pole layer and the return yoke layer toward the air bearing surface. This suppresses thermal protrusion from occurring on the thin film magnetic head due to ambient temperature environment. | 10-02-2008 |
20090052094 | Magnetic head for perpendicular magnetic recording and method of manufacturing the same, the magnetic head including pole layer and two shields sandwiching the pole layer - A magnetic head includes a pole layer, a first and a second shield disposed to sandwich the pole layer, and a nonmagnetic layer disposed around the first shield. The pole layer includes a first portion having an end face located in a medium facing surface, and a second portion that is located farther from the medium facing surface than is the first portion. The second portion is greater in thickness than the first portion. A bottom surface of the second portion is located closer to a substrate than is a bottom surface of the first portion. The first shield has a first top surface portion opposed to the bottom surface of the first portion with the first gap layer in between. The nonmagnetic layer has a second top surface portion opposed to the bottom surface of the second portion with the first gap layer in between. A difference in level is formed between the first and the second top surface portion such that the second top surface portion is located closer to the substrate than is the first top surface portion. | 02-26-2009 |
20090273863 | Thin-film magnetic head for perpendicular magnetic recording and method of making the same - A perpendicular recording thin-film magnetic head comprises a main magnetic pole having a tip main magnetic pole part extending in a height direction from a medium-opposing surface and a base main magnetic pole part connected to the tip main magnetic pole part on a side opposite from the medium-opposing surface side and wider than the tip main magnetic pole part in a track width direction; a return yoke extending in the height direction from the medium-opposing surface and magnetically coupling with the base main magnetic pole part at a position distanced from the medium-opposing surface in the height direction, while opposing the tip main magnetic pole part through a write gap layer in a bit length direction in the medium-opposing surface; and a main magnetic pole adjacent magnetic shield layer extending along at least part of side faces of the main magnetic pole other than the medium-opposing surface as seen in a laminating direction, while holding a nonmagnetic layer between the main magnetic pole and the main magnetic pole adjacent magnetic shield layer. | 11-05-2009 |
20100078316 | METHOD OF FORMING MASK FOR DRY ETCHING AND MANUFACTURING METHOD OF MAGNETIC HEAD USING THE SAME METHOD - The present invention relates to a method for forming a dry etching mask. A plurality of aluminum oxide films are sequentially sputtered on a material to be dry etched in such a manner that etching rate with respect to reactive ion etching increases toward a lower layer. On a laminated film of the plurality of aluminum oxide films, there is formed a first mask that has etching resistance with respect to the reactive ion etching. Reactive ion etching is performed from above the first mask to form a second mask of the laminated film. | 04-01-2010 |
20100084262 | MANUFACTURING METHOD OF PERPENDICULAR MAGNETIC RECORDING HEAD - The present invention relates to a method for manufacturing a perpendicular recording magnetic head. The method for manufacturing a perpendicular recording magnetic head according to the present invention includes first to third steps. At the first step, a main magnetic pole layer is formed on a foundation layer. At the second step, a main magnetic pole forming mask whose recording-medium-facing surface is of an inverted trapezoidal shape is formed on the main magnetic pole layer. At the third step, a main magnetic pole whose recording-medium-facing surface is of an inverted trapezoidal shape is formed by performing ion milling on a laminated structure including the foundation layer and the main magnetic pole layer from a direction which makes a given angle with a lamination direction according to a bevel angle of the inverted trapezoidal shape. | 04-08-2010 |
20100172054 | Perpendicular magnetic write head, method of manufacturing the same and method of forming magnetic layer pattern - In a perpendicular magnetic write head manufacturing method a magnetic layer is formed on a substrate. On the magnetic layer, first and second nonmagnetic layers are formed with different materials. A mask pattern is formed on the second nonmagnetic layer, and the second nonmagnetic layer in a region not covered with the mask pattern is removed Thereby, the patterned second nonmagnetic layer is formed while leaving the first nonmagnetic layer. The mask pattern is removed and a milling process is selectively performed on the first nonmagnetic layer and the magnetic layer with the patterned second nonmagnetic layer as a mask to remove all of the first nonmagnetic layer in an exposed region and to dig down the magnetic layer in the exposed region, thereby forming a main magnetic pole layer having an inclined part whose thickness decreases with distance from an edge position of the patterned second nonmagnetic layer. | 07-08-2010 |
20110090595 | Magnetic head for perpendicular magnetic recording and method of manufacturing same - A main magnetic pole includes a first part extending from a medium facing surface to a point at a predetermined distance from the medium facing surface, and a second part other than the first part. An accommodation part for accommodating the main magnetic pole includes: a first layer having a groove; a second layer lying between the first layer and the main magnetic pole in the first layer's groove; and a third layer interposed in part between the second layer and the main magnetic pole in the first layer's groove. The second layer is formed of a metal material different from a material used to form the first layer. The third layer is formed of an inorganic insulating material. The second and third layers lie between the first layer and the first part. The second layer lies between the bottom of the first layer's groove and the second part, but the third layer does not. The distance between the bottom of the first layer's groove and the second part is smaller than that between the bottom and the first part. | 04-21-2011 |
20130062307 | METHOD OF MAKING A MASK, METHOD OF PATTERNING BY USING THIS MASK AND METHOD OF MANUFACTURING A MICRO-DEVICE - The present invention relates to a method of making a mask for patterning a thin film The method includes a step of forming an inorganic material, which is resolvable into alkali solution, on a substrate; a step of forming the inorganic material in a predetermined pattern; and a step of narrowing the inorganic material with the alkali solution to form the mask. | 03-14-2013 |
20130286507 | THIN-FILM MAGNETIC HEAD AND METHOD OF MAKING WHERE THE HEAD INCLUDES AN ANTIREFLECTION FILM COVERING A LEADING SHIELD - A thin-film magnetic head has a high write performance because its shape is smooth without roughness. The thin-film magnetic head includes a slider substrate, a write element and an antireflection film. The slider substrate has an air bearing surface at one side and supports a first support layer. The first support layer has a leading shield, and the leading shield has a low-level flat part, a slope part and a high-level flat part continuously arranged at one side in the recited order toward the air bearing surface. The antireflection film entirely covers the low-level flat part, the slope part and the high-level flat part of the leading shield. The write element has a recording magnetic pole film, and the recording magnetic pole film is formed above the antireflection film. | 10-31-2013 |
20140002921 | THIN-FILM MAGNETIC RECORDING HEAD WITH THIN FILM WHICH CONSTRUCTS SENSOR OR HEATER BENEATH MAIN MAGNETIC POLE | 01-02-2014 |
20140098441 | PERPENDICULAR MAGNETIC WRITE HEAD AND MAGNETIC RECORDING DEVICE - A perpendicular magnetic write head includes: a magnetic pole having an end surface exposed on an air bearing surface, and extending in a height direction perpendicular to the air bearing surface; a first yoke having an end surface exposed on the air bearing surface, and facing a forward section of the magnetic pole with a gap layer in between; a second yoke located behind the first yoke with an insulating layer in between in the height direction, and connected to a backward section of the magnetic pole; a shield connecting the first yoke to the second yoke; and an additional magnetic layer located behind a boundary between the first yoke and the insulating layer, and in contact with the first yoke. | 04-10-2014 |
Patent application number | Description | Published |
20090192062 | Phosphorus molybdenum compound and method for producing same - Provided is a phosphorus molybdenum amine compound, represented by the following general formula (1). | 07-30-2009 |
20090270289 | Phosphorus-molybdenum compound, method for producing same and lubricant additive and lubricant composition containing the compound - A lubricating oil additive capable of providing an antioxidant which enables a lubricating oil composition to have long drain intervals, while reducing specific components such as metals and phosphorus atoms, and a lubricating oil composition containing the lubricating oil additive are provided. A phosphorus molybdenum compound represented by the following general formula (1) | 10-29-2009 |
20120129998 | METAL PIGMENT, METHOD FOR PRODUCING THE SAME, AND WATER BASE METALLIC RESIN COMPOSITION INCLUDING THE SAME - The metal pigment of the present invention has a structure in which an organic carboxylic acid metal salt is adhered onto metal particles, and may also have a structure in which a first compound is adhered onto the metal particles, and the organic carboxylic acid metal salt is adhered onto the first compound. | 05-24-2012 |
20120309656 | LUBRICATING OIL COMPOSITION - Provided is a lubricating oil composition, including a base oil and a specific condensed phosphate blended with various additives. | 12-06-2012 |
20120329693 | ADDITIVE FOR LUBRICATING OIL AND LUBRICATING OIL COMPOSITION CONTAINING SAME - Provided are an additive for lubricating oil, including a compound represented by the following general formula (1) as an essential component, and a lubricating oil composition blending same: | 12-27-2012 |
20130184190 | ANTIOXIDANT COMPOSITION AND LUBRICATING OIL COMPOSITION CONTAINING SAME - Provided is an antioxidant composition, including: a compound (A) represented by the following general formula (1); and an amine-based antioxidant (B) and/or a phenol-based antioxidant (C) other than the compound (A): | 07-18-2013 |
20130310289 | LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINES - Provided is a lubricating oil composition for an internal combustion engine, including: an organic molybdenum compound as a component (A); a base oil having a kinematic viscosity at | 11-21-2013 |
Patent application number | Description | Published |
20130152624 | POWER CONVERTER AND REFRIGERATING AND AIR-CONDITIONING APPARATUS - A power converter includes step-up means for varying a voltage applied by a power supply to a predetermined voltage, commutating means for performing a commutation operation for allowing a current flowing through the step-up means to flow through a second path, smoothing means for smoothing a voltage related to outputs of the step-up means and the commutating means to produce power and supplying the power to a load side, and control means for performing control related to voltage varying, such as stepping up, by the step-up means and controlling the commutation operation of the commutating means on the basis of at least one of a voltage and a current related to the step-up means. | 06-20-2013 |
20150102759 | POWER CONVERSION DEVICE, MOTOR DRIVE CONTROL APPARATUS INCLUDING THE POWER CONVERSION DEVICE, AIR BLOWER AND COMPRESSOR INCLUDING THE MOTOR DRIVE CONTROL APPARATUS, AND AIR CONDITIONER INCLUDING THE AIR BLOWER OR THE COMPRESSOR - A power conversion device includes a switching control unit that controls respective switching elements constituting a plurality of chopper circuits, a rectified-voltage detection unit, a bus-bar voltage detection unit, and a bus-bar current detection unit. The switching control unit includes an on-duty calculation unit that calculates a reference on-duty of respective drive pulses with respect to the switching elements based on a bus-bar voltage and a bus-bar current, an on-duty correction unit that corrects the reference on-duty to output on-duties of the respective drive pulses based on the bus-bar current, so that change amounts of respective reactor currents become substantially the same, and a drive-pulse generation unit that generates the respective drive pulses, based on the respective on-duties. | 04-16-2015 |
Patent application number | Description | Published |
20080266718 | 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 magnetization-fixed layer and the magnetization-free layer. The method includes a step of feeding through the MR read head element a sense current, a step of measuring non-signal output versus frequency characteristics of the MR read head element over a frequency range that covers at least FMR of the magnetization-fixed layer, and a step of discriminating whether the thin-film magnetic head is a head providing high-temperature noises by comparing a frequency of a peak of the non-signal output resulting from FMR of the magnetization-fixed layer with a threshold. | 10-30-2008 |
20090052089 | THIN-FILM MAGNETIC HEAD HAVING CPP STRUCTURE MAGNETO-RESISTIVE EFFECT DEVICE AND HARD DISK SYSTEM - The thin-film magnetic head of the invention comprises a magneto-resistive effect device of the CPP (current perpendicular to plane) structure including a multilayer film comprising a stack of a fixed magnetization layer, a nonmagnetic layer and a free layer stacked one upon another in order, with a sense current applied in the stacking direction of the multilayer film, and an upper shield layer and a lower shield layer with the magneto-resistive effect device held between them in the thickness direction, and further comprises a bias magnetic field-applying layer located at each end of the multilayer film in the widthwise direction and a re-magnetizer unit designed such that when the bias magnetic field-applying layers malfunction, they are re-magnetized to go back to normal. Therefore, when the bias magnetic field-applying layers degrade with an increasing error rate of a hard disk system, it is possible to re-magnetize them without dismantling the hard disk system, so that the hard disk system can be kept going on. | 02-26-2009 |
20100033879 | PERPENDICULAR MAGNETIC HEAD AND MAGNETIC RECORDING SYSTEM - A perpendicular magnetic head for writing information on a magnetic recording medium comprises an ABS, a coil for generating a magnetic flux, a magnetic pole layer, a magnetic shield layer, and a gap layer disposed between the magnetic pole layer and the magnetic shield layer. Further the magnetic head has a non-magnetic region of a non-magnetic material. The non-magnetic region is disposed in the magnetic shield layer and positioned behind the ABS at a predetermined distance. The non-magnetic region is also disposed in the magnetic shield layer and has a predetermined width. With such a configuration, an undesirable concentration of the magnetic flux on the ABS is prevented. | 02-11-2010 |