Patent application number | Description | Published |
20080222878 | Method of manufacturing magnetic head - A method of manufacturing a magnetic head includes the steps of: fabricating a substructure in which pre-head portions are aligned in a plurality of rows by forming components of a plurality of magnetic heads on a single substrate; and fabricating the plurality of magnetic heads by separating the pre-head portions from one another through cutting the substructure. In the step of fabricating the substructure, the resistance of an MR film that will be formed into an MR element by undergoing lapping later is detected to determine the target position of the boundary between a track width defining portion and a wide portion of a pole layer based on the resistance thus obtained, and the pole layer is thereby formed. In the step of fabricating the magnetic heads, the surface formed by cutting the substructure is lapped such that the MR film is lapped and the resistance thereof thereby reaches a predetermined value. | 09-18-2008 |
20080222879 | Method of manufacturing magnetic head and method of manufacturing magnetic head substructure - A method of manufacturing a magnetic head includes the steps of: fabricating a substructure in which pre-head portions are aligned in a plurality of rows by forming components of a plurality of magnetic heads on a single substrate; and fabricating the plurality of magnetic heads by separating the pre-head portions from one another through cutting the substructure. In the step of fabricating the substructure, the resistance of an MR film that will be formed into an MR element by undergoing lapping later is detected to determine the target position of the boundary between a track width defining portion and a wide portion of a pole layer based on the resistance detected, and the pole layer is thereby formed. In the step of fabricating the magnetic heads, the surface formed by cutting the substructure is lapped such that the MR film is lapped and the resistance thereof thereby reaches a predetermined value. | 09-18-2008 |
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 |
20080253032 | Thin film magnetic head, head gimbal assembly, head arm assembly, magnetic disk device and method of forming thin film magnetic head - A thin film magnetic head is provided, in which thermal protrusion can be suppressed. The thin film magnetic head includes a main magnetic pole layer which conducts a magnetic flux into the recording medium so that the recording medium is magnetized in a direction perpendicular to a surface of the recording medium, a first return yoke layer provided in a trailing side of the main magnetic pole layer, and has a recess in a top surface, a second return yoke layer provided so as to fill at least the recess of the first return yoke layer, and a thermal expansion suppression layer provided in a trailing side of the second return yoke layer. Thus, since the thermal expansion suppression layer can be provided on a surface having no recess, a possibility of a crack in the thermal expansion suppression layer can be eliminated. | 10-16-2008 |
20080253034 | Perpendicular magnetic write head, method of manufacturing the same, and magnetic write system - The present invention is directed to providing a perpendicular magnetic write head which can suppress unintended erasure of information written on a write medium at a non-writing time by optimizing a magnetic domain structure of main component elements that are engaged in writing operation. In the perpendicular magnetic write head, an auxiliary magnetic pole layer is disposed on a trailing or leading side of a main magnetic pole layer, the auxiliary magnetic pole layer being recessed from the main magnetic pole layer. When the main magnetic pole layer has a tensile stress as its internal stress, a nonmagnetic layer disposed in a layer same as the auxiliary magnetic pole layer and in an area in front of the auxiliary magnetic pole layer, also has a tensile stress as its internal stress. | 10-16-2008 |
20080297953 | Magnetic head for perpendicular magnetic recording with a shield and method of manufacturing same - A magnetic head includes: a coil; a pole layer; a shield having an end face located in a medium facing surface forward of an end face of the pole layer along a direction of travel of a recording medium; a gap layer between the shield and the pole layer; and a substrate on which the foregoing elements are stacked. The top surface of the pole layer includes: first and second portions with a difference in height therebetween; and a third portion connecting the first and second portions to each other. The first portion has an edge located in the medium facing surface, and the second portion is located farther from the medium facing surface and from the substrate than the first portion. The magnetic head further includes a nonmagnetic layer disposed between the second portion and the gap layer. The nonmagnetic layer has a surface touching the second portion, the surface having an edge located at the boundary between the second and third portions. The nonmagnetic layer has a thickness equal to or greater than the difference in height between the first and second portions. | 12-04-2008 |
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 |
20090092319 | PHASE-INFORMATION EXTRACTION METHOD - Only phase information of a measurement object is extracted with superior precision from a phase-information image in which background phase information is superimposed on phase information of the measurement object. A method of extracting phase information of a measurement object includes a region-specifying step of specifying a region in which a measurement object exists and a region in which no measurement object exists in a phase-information image containing measurement objects, showing a two-dimensional distribution of phase information to be measured, a background-image creating step of creating a background phase-information image by interpolating the phase information of the region in which the measurement object exists on the basis of the phase information of the region in which no measurement object exists, specified in the region-specifying step; and a difference calculating step of calculating a difference between the background phase-information image created in the background-image creating step and the phase-information image. | 04-09-2009 |
20090097016 | CULTURE VESSEL AND CELLULAR THICKNESS MEASUREMENT METHOD - To enable precise measurement of a cellular thickness distribution regardless of changes in the refractive index of a culture solution with the progress of culture. There is provides a culture vessel made of a transparent material with a culture surface capable of culturing cells in an adhesive manner on the bottom face, wherein a reference substance having an already known refractive index and an already known thickness dimension is fixed to a part of the culture surface. | 04-16-2009 |
20090097734 | CELLULAR THICKNESS MEASUREMENT METHOD - To enable precise measurement of a cellular thickness distribution regardless of changes in the refractive index of cell(s). Two-dimensional distribution of phase information is obtained, in a state where a first culture solution having a first refractive index is stored so as to completely immerse cells adhered onto a bottom face of a culture vessel, by transmitting light of a wavelength, and by photographing the transmitted light. Next, two-dimensional distribution of phase information is obtained, in a state where a second culture solution having a second refractive index is stored to have a depth to completely immerse the cells in the culture vessel, by transmitting light, and by photographing the transmitted light. Next, respective average values of the phase information are calculated. Next, the refractive index of the cell is estimated. Next, the thickness dimension is calculated using the refractive index. | 04-16-2009 |
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 |
20100302662 | TESTING METHOD OF WAFER WITH THIN-FILM MAGNETIC HEADS AND MANUFACTURING METHOD OF THIN-FILM MAGNETIC HEAD - A testing method of a wafer provided with a plurality of thin-film magnetic heads is provided. Each of the plurality of thin-film magnetic heads includes a main pole layer, a first test pad formed on the wafer and electrically connected with an extended top end section of the main pole layer and a second test pad formed on the wafer and electrically connected with a back end section of the main pole layer. The testing method includes a step of measuring an electrical resistance between the first test pad and the second test pad, a step of judging whether the measured electrical resistance is within a set range, and a step of discriminating that the thin-film magnetic head is a non-defective product when the measured electrical resistance is within the set range. | 12-02-2010 |
20130304134 | BIODEGRADABLE IMPLANT AND FABRICATION METHOD THEREOF - The present invention can suitably be used even in a site where hydrogen gas is metabolized slowly, such as the osseous tissue. Provided is a biodegradable implant including a biodegradable magnesium member formed of a magnesium alloy and coating layers that coat the biodegradable magnesium member, thereby reducing the degradation rate thereof in a living organism, wherein a depression to be infiltrated by an osteoblast is formed in a surface of the biodegradable magnesium member. | 11-14-2013 |