33 results about "Recording density" patented technology

A hexagonal ferrite magnetic powder is significantly more useful for achieving simultaneously both the enhancement of the recording density and the enhancement of the SNR of a magnetic recording medium. The hexagonal ferrite magnetic powder contains Bi at a Bi / Fe molar ratio in a range of 0.035 or less, has a saturation magnetization σs of 42.0 Am2 / kg or more and a Dx volume calculated based on the crystallite diameters of 1,800 nm3 or less. A method for producing hexagonal ferrite magnetic powder includes a step of performing a treatment of immersing hexagonal ferrite magnetic powder containing Bi in a solution having dissolved therein a compound X that forms a complex with Bi, so as to elute a part of Bi existing in the hexagonal ferrite magnetic powder into the solution.

To provide a magnetic head and a magnetic recording device capable of improving recording density. According to an embodiment, a magnetic head includes a pole, a shield, and a non-magnetic layer. The non-magnetic layer is disposed between the pole and the shield. The non-magnetic layer is in contact with the pole and the shield. The non-magnetic layer contains at least one first element selected from Cu, Au, Cr, V, Al, and Ag.

To provide a magnetic recording medium in which perpendicular orientation of a magnetic recording layer is enhanced and further high recording density is made possible, and to provide a magnetic recording and reproducing device provided with the magnetic recording medium.SOLUTION: A magnetic recording medium 1 according to the present invention includes an underlayer 30, a seed layer 40, and a magnetic recording layer 60 in this order on a non-magnetic substrate 10, wherein the seed layer 40 contains two elements phase-separated from each other, one phase of an element α mainly has a columnar crystal of an fcc structure, and the other phase of an element β mainly has an amorphous structure, the underlayer 30 includes a first underlayer 31, a second underlayer 32, and a third underlayer 33 from the side of the non-magnetic substrate 10, the first underlayer 31 mainly contains any of Ru, Cr, and Ni, the second underlayer 32 mainly contains the one element α, and the third underlayer 33 mainly contains any of Ru, Cr, and Mo.SELECTED DRAWING: Figure 1

Provided is a magnetic recording device capable of achieving an increase in recording density. According to an embodiment, the magnetic recording device includes a magnetic head and a control section. The magnetic head includes a first magnetic pole, a magnetic element, and a coil, and the magnetic element includes a magnetic layer. The control section is electrically connected to the magnetic element and the coil. The control section is capable of supplying a recording current to the coil and an element current to the magnetic element. The recording current includes a first period of a first polarity, a second period of a second polarity different from the first polarity, a third period of transition from the first period to the second period, and a fourth period of transition from the second period to the first period. The element current includes a direct current component and an alternating current component. The alternating current component in the first period is the same as the alternating current component in the second period, the alternating current component in the third period, and the alternating current component in the fourth period.

The present invention provides hexagonal ferrite magnetic powder which is extremely useful in achieving both an increase in recording density and an increase in SNR of a magnetic recording medium, is crystalline and has a high saturation magnetization. The hexagonal ferrite magnetic powder contains Bi in a range of a Bi / Fe molar ratio of 0.035 or less, has a saturation magnetization σs of 42.0 Am 2 / kg or more, and a Dx volume of 1800 nm 3 or less, based on a microcrystal diameter. The magnetic powder can be produced by a method for producing hexagonal ferrite magnetic powder, comprising a process of immersing hexagonal ferrite magnetic powder containing Bi in a solution in which a compound X that forms a complex with Bi is dissolved, thereby performing a treatment of dissolving a part of the Bi present in the hexagonal ferrite magnetic powder into the solution.

A semiconductor device with high recording density is used. First and second transistors, first and second conductors, and first to third insulators are included. In the first transistor, an oxide semiconductor is located above the first insulator, a source and a drain are located over the semiconductor layer and the first insulator, and a gate is located above the semiconductor layer. The second insulator is located above the first insulator and includes an opening whose bottom surface corresponds to the first insulator and in which the first conductor is provided, in a region not overlapping with the source or the drain of the first transistor. The third insulator is located over the second insulator and the first conductor and includes an opening whose bottom surface corresponds to the gate of the first transistor and in which the second conductor is provided. In the second transistor, a semiconductor layer is located above the third insulator in a region overlapping with the first conductor, and a source and a drain are located over the semiconductor layer and the third insulator. In particular, one of the source and the drain is also located over the second conductor.

Provided are a magnetic head and a magnetic recording device capable of achieving an increase in recording density. According to an embodiment, the magnetic head includes a first and a second magnetic pole, and a laminate disposed between the first and second magnetic poles. The laminate includes a first magnetic layer, a second magnetic layer disposed between the first magnetic layer and the second magnetic pole, a first non-magnetic layer disposed between the first magnetic layer and the second magnetic layer, a second non-magnetic layer disposed between the second magnetic layer and the second magnetic pole, and a third non-magnetic layer disposed between the first magnetic pole and the first magnetic layer. The first magnetic layer contains a first element including at least one of Fe, Co, and Ni. The second magnetic layer contains (Fe 100‑x Co x ) 100‑y E y (10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%). The second element E includes at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first magnetic layer does not contain the second element, or the concentration of the second element in the first magnetic layer is lower than the concentration of the second element in the second magnetic layer.

A method according to one embodiment includes acquiring a result of quality inspection related to recording quality of first sectors included in a first storage area of a magnetic disk. The method includes calculating a first number being the number of sectors corresponding to a capacity obtained by subtracting a set capacity from an actual capacity of the first storage area. The first number is calculated based on the set capacity of the first storage area and a set value of recording density of the first storage area. The method includes selecting a second number of sectors from the first sectors based on the result of quality inspection. The method includes assigning addresses to a group of sectors that are not included in the second number of sectors among the first sectors. The group of sectors consists of sectors with the number corresponding to the set capacity.

The purpose of the present invention is to provide a magnetic recording medium which stably maintains a state in which a granular magnetic layer forms a granular structure therein, and which improves the surface recording density. The magnetic recording medium has a substrate, an underlayer, a first magnetic layer, and a second magnetic layer in this order, the first magnetic layer including magnetic particles having an L10 structure, and the second magnetic layer including magnetic particles having an L10 structure and having a granular structure including a grain boundary portion of hexagonal boron nitride. The (111) plane of the magnetic particles contained in the first magnetic layer is covered with an alloy of VN, Si3N4, YN, or TiN at the interface with the second magnetic layer, and the magnetic particles contained in the second magnetic layer are epitaxially grown from the (001) plane of the magnetic particles contained in the first magnetic layer. The magnetic particles contained in the first magnetic layer and the magnetic particles contained in the second magnetic layer are each columnar crystals penetrating the first magnetic layer and the second magnetic layer.

The present disclosure provides a magnetic recording device capable of improving recording density. According to one embodiment, a magnetic recording apparatus includes a magnetic head and a control unit. The magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element, a coil, a first terminal, and a second terminal. The control unit is configured to perform a first operation. In the first operation, the control unit supplies a recording-time element current to the magnetic element and supplies a recording-time coil current to the coil. The absolute value of the coil current during recording is equal to or less than a first coil current value corresponding to the first peak.

Provided are a magnetic tape winding method and a magnetic tape device, and the technical field relates to storage technology. The method is applied to a magnetic tape device, and the magnetic tape device comprises a magnetic tape, a first winding drum and a second winding drum, and the first winding drum and the second winding drum are used for winding the magnetic tape. The method comprises the following steps: determining a creep state of the magnetic tape, the creep state comprising a first creep variable of the magnetic tape on the first winding drum side and a second creep variable of the magnetic tape on the second winding drum side; determining a standby winding state of the magnetic tape based on the creep state, the standby winding state being one of at least one winding state of the magnetic tape, and the same part of the magnetic tape being subjected to different stresses in different winding states; and driving the magnetic tape to be wound, so that the magnetic tape is in the standby winding state after being wound. In this way, the occurrence or severity of the magnetic tape winding creep can be inhibited, the stress borne by the whole magnetic tape is balanced, the track tracking error caused by the winding creep is inhibited, the recording density and the track tracking accuracy of the magnetic tape are improved, and thus the data read-write capability of the magnetic tape is improved.

To provide a method and a magnetic disk apparatus capable of improving recording quality.SOLUTION: A method includes acquisition, calculation, selection, and assignment. The acquisition is to acquire a result of quality inspection related to recording quality of a first plurality of sectors included in a first storage area of a magnetic disk. The calculation is to calculate, based on a set capacity of the first storage area and a set value of a recording density of the first storage area, a first number that is the number of sectors corresponding to a capacity obtained by subtracting a set capacity from an actual capacity of the first storage area. The selection is to select a second number of sectors of the first plurality of sectors based on the result. The assignment is to assign an address usable by a host to a group of a number of sectors corresponding to the set capacity not included in the second number of sectors of the first plurality of sectors.SELECTED DRAWING: Figure 12

A magnetic head and a magnetic recording device capable of improving recording density are provided. According to an embodiment, the magnetic head includes a first pole, a second pole, and a laminate provided between the first pole and the second pole. The laminate includes a first magnetic layer, a second magnetic layer provided between the second pole and the first magnetic layer, a third magnetic layer provided between the second pole and the second magnetic layer, a first non-magnetic layer provided between the first magnetic layer and the first pole, a second non-magnetic layer provided between the second magnetic layer and the first magnetic layer, a third non-magnetic layer provided between the third magnetic layer and the second magnetic layer, and a fourth non-magnetic layer provided between the second pole and the third magnetic layer. A first thickness of the first magnetic layer in a first direction from the first pole toward the second pole is thicker than a second thickness of the second magnetic layer in the first direction. A third thickness of the third magnetic layer in the first direction is thicker than the second thickness.

A magnetic head and a magnetic recording device capable of increasing the recording density are provided. According to an embodiment, the magnetic head includes a first magnetic pole, a second magnetic pole, and a laminate. The laminate includes a first magnetic layer to a fourth magnetic layer and a first non-magnetic layer to a fifth non-magnetic layer. The second non-magnetic layer is in contact with the second magnetic layer and the first magnetic layer, the third non-magnetic layer is in contact with the third magnetic layer and the second magnetic layer, the fourth non-magnetic layer is in contact with the fourth magnetic layer and the third magnetic layer. The fourth thickness of the fourth magnetic layer along a first direction from the first magnetic pole to the second magnetic pole is 0.5 times or more and 1.6 times or less the first thickness of the first magnetic layer along the first direction, and the second thickness of the second magnetic layer along the first direction is less than the first thickness.

The present disclosure provides a magnetic head and a magnetic recording apparatus capable of achieving an increase in recording density. According to an embodiment, the magnetic head includes a first magnetic pole, a second magnetic pole, and a laminate provided between the first magnetic pole and the second magnetic pole. A third magnetic layer included in the laminate contains (Fe 100‑x Co x ), 100‑y E y , a second element E includes at least one selected from Cr, V, Mn, Ti, and Sc, where 10 atm% ≤ x ≤ 50 atm% and 10 atm% ≤ y ≤ 90 atm%.

The embodiment relates to a method and a magnetic disk device. The method comprises the steps of obtaining, calculating, selecting and distributing. The obtaining means obtaining the result of a quality check associated with the recording quality of a first plurality of sectors included in a first storage area of the disk. The calculation is to calculate a first number, which is the number of sectors corresponding to the capacity obtained by subtracting the set capacity from the actual capacity of the first storage region, on the basis of the set capacity of the first storage region and the set value of the recording density of the first storage region. The selection means that a second number of sectors among the plurality of sectors are selected on the basis of the result. The assignment is to assign an address usable by the host to a group of sectors corresponding to the set capacity and not included in the second number of sectors among the plurality of first sectors.

The purpose of the present invention is to provide: a method for manufacturing a magnetic recording medium, which can improve the vertical orientation of a magnetic recording layer and can further increase the recording density; and a magnetic recording / reproducing device provided with a magnetic recording medium manufactured by the manufacturing method. The method for manufacturing a magnetic recording medium according to the present invention is a method for manufacturing a magnetic recording medium provided with an underlayer, a seed layer, and a magnetic recording layer in this order on a non-magnetic substrate, the seed layer being formed by forming a film containing two elements, i.e., an element [alpha] and an element [beta], the element [alpha] being mainly a columnar crystal having an fcc structure, and the element [beta] being mainly a columnar crystal having an fcc structure. After the film is formed such that the element [beta] mainly has an amorphous structure, the surface of the film is etched to form a surface in which the element [alpha] and the element [beta] are separated from each other.

Provided is a magnetic recording medium having a high linear recording density.　This magnetic recording medium is a tape-like magnetic recording medium, and comprises a base and a magnetic layer containing magnetic particles. The average thickness of the magnetic recording medium is 5.30 μm or less. The average particle volume of the magnetic particles is 1.50 × 103 nm3 or less. When a signal is recorded in the magnetic layer at a recording wavelength of 739.2 nm, the sum (σ1 + σ2) of a peak variation σ1 at a magnetization reversal position, the peak variation being obtained by measuring a recorded portion of the signal by a magnetic force microscope, and a peak interval variation σ2 is 18.5 nm or less.

This invention provides a method, apparatus, computer device, and storage medium for storing sensing data, relating to the field of data storage technology. The method includes: calculating the environmental state similarity between adjacent acquisition times based on environmental state vectors at each acquisition time; aggregating and storing storage entries corresponding to consecutively occurring identical environmental states at each acquisition time based on a comparison of the environmental state similarity between adjacent acquisition times and a dynamic threshold, forming storage records; calculating the current storage record density and the environmental state change frequency of each storage record based on the storage records, and then generating a hierarchical storage strategy through preset storage rules; and performing hierarchical storage of the environmental state vectors and storage records based on the hierarchical storage strategy. The technical solution provided by this invention effectively removes spatiotemporal repetition information when storing sensing data, saves storage space for edge devices, improves data processing efficiency, and extends hardware lifespan.

To provide a magnetic recording medium in which surface recording density is further improved by stably maintaining a state where a granular structure is formed inside a granular magnetic layer.SOLUTION: A substrate, an underlayer, a first magnetic layer, and a second magnetic layer in this order, the first magnetic layer including magnetic grains having a L10 structure, and the second magnetic layer including magnetic grains having a L10 structure and a granular structure having a grain boundary part containing hexagonal boron nitride, the (111) planes of the magnetic grains included in the first magnetic layer are covered with aluminum nitride at the interface with the second magnetic layer, the magnetic grains included in the second magnetic layer are epitaxially grown from the (001) planes of the magnetic grains included in the first magnetic layer, and the magnetic grains included in the first magnetic layer and the magnetic grains included in the second magnetic layer are columnar crystals penetrating the first magnetic layer and the second magnetic layer, respectively.SELECTED DRAWING: Figure 1

The present application provides a magnetic head and a magnetic recording device capable of improving recording density. According to an embodiment, the magnetic head includes a first pole, a second pole, a laminate, and first to third terminals. The laminate is disposed between the first pole and the second pole. The laminate includes first to fourth magnetic layers and first to fifth non-magnetic layers. The first terminal is electrically connected to the first pole. The second terminal is electrically connected to the second pole. The third terminal is electrically connected to the third non-magnetic layer.

Provided is a magnetic recording device capable of improving recording density. According to one embodiment, a magnetic recording apparatus includes a magnetic head and a control unit. The magnetic head includes first and second magnetic poles, a magnetic element, and a coil. The control unit is configured to perform a first operation. In the first operation, the control unit is configured to supply a recording-time element current to the magnetic element and supply a recording-time coil current to the coil. The absolute value of the coil current during recording is greater than the coil current value. The element current during recording is equal to or less than the first current value.

A main object is to provide a magnetic recording medium having a high recording density to be capable of preventing an increase in frictional force even in a case where many times of traveling is performed. Furthermore, in addition to the prevention of an increase in frictional force, a further object of the present technology is maintenance of the polishing force at the time of many times of traveling.The present technology provides a magnetic recording medium including a magnetic layer containing a magnetic powder, the magnetic layer containing first particles having conductivity and second particles having a Mohs hardness of 7 or more, the first particles and the second particles forming protrusions on a surface on a side of the magnetic layer, the second particles forming protrusions having an average height (H2) of 7 nm or less on the surface on the side of the magnetic layer, the magnetic recording medium containing a fatty acid, the magnetic recording medium having an extraction rate of the fatty acid of 45% or more, the extraction rate defined by a formula described below.Extraction rate of fatty acid (%)=[amount of fatty acid extracted in 5 minutes (mg / m2) / total amount of fatty acid extracted (mg / m2)]×100

Provided are: a magnetic recording medium in which the vertical orientation of a magnetic recording layer is improved and the recording density can be increased; and a magnetic recording / reproducing device provided with such a magnetic recording medium. A magnetic recording medium according to the present invention is provided with a non-magnetic substrate, an underlayer on the non-magnetic substrate, a seed layer on the underlayer, and a magnetic recording layer on the seed layer, the seed layer containing two elements phase-separated from each other, the phase of one element [alpha] being mainly a columnar crystal having an fcc structure, and the phase of the other element [alpha] being substantially a columnar crystal having a fcc structure. The one element [alpha] mainly has an amorphous structure, and the other element [beta] mainly has an amorphous structure, and the underlayer includes, from the non-magnetic substrate side, a first underlayer, a second underlayer, and a third underlayer, the first underlayer mainly including any one of Ru, Cr, and Ni, the second underlayer mainly including the one element [alpha], and the third underlayer mainly including any one of Ru, Cr, and Mo.

The present invention provides a magnetic head and a magnetic recording device capable of improving the recording density. According to an embodiment, the magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element, and a magnetic member. The magnetic element is disposed between the first magnetic pole and the second magnetic pole and includes a first magnetic layer. The magnetic member includes a first magnetic portion. A second direction from the first magnetic portion to the magnetic element intersects a first direction from the first magnetic pole to the second magnetic pole. The first magnetic portion includes a magnetic material. The magnetic material includes at least any one of a first material, a second material, and a third material. The first material includes at least one selected from the group consisting of Mn3Sn, Mn3Ge, and Mn3Ga. The second material includes at least one selected from the group consisting of a cubic or tetragonal compound containing Mn and Ni, a cubic alloy of Mn containing a γ phase, and a cubic alloy of Fe. The third material includes an antiferromagnet.

The purpose of the present invention is to provide a magnetic recording medium which stably maintains a state in which a granular structure is formed in a granular magnetic layer, and which further improves the surface recording density. A magnetic recording medium according to the present invention has a substrate, an underlayer, a first magnetic layer, and a second magnetic layer in this order, the first magnetic layer containing magnetic particles having an L10 structure, and the second magnetic layer including magnetic particles having an L10 structure and having a granular structure including a grain boundary portion of hexagonal boron nitride. The (111) plane of the magnetic particles contained in the first magnetic layer is covered by aluminum nitride at the interface with the second magnetic layer, and the magnetic particles contained in the second magnetic layer are epitaxially grown from the (001) plane of the magnetic particles contained in the first magnetic layer. The magnetic particles included in the first magnetic layer and the magnetic particles included in the second magnetic layer are each columnar crystals penetrating the first magnetic layer and the second magnetic layer.

A magnetic recording medium having a high recording density to be capable of preventing an increase in frictional force even in a case where many times of traveling is performed. A magnetic recording medium includes a magnetic layer containing a magnetic powder, the magnetic layer containing first particles having conductivity and second particles having a Mohs hardness of 7 or more, the first and second particles forming protrusions on a surface on a side of the magnetic layer, the second particles forming protrusions having an average height (H2) of 7 nm or less on the surface on the side of the magnetic layer, the magnetic recording medium containing a fatty acid and fatty acid ester, with an extraction rate of the fatty acid of 45% or more, and an extraction rate of the fatty acid ester of 60% or more.

A test pattern is printed that allows for easy verification of the possibility of ink dripping on the media when confirming the maximum amount of ink ejected per unit area from the print head. [Solution] A printing apparatus comprising: a transport unit for transporting a medium in a transport direction; a print head capable of ejecting ink onto the medium; and a control unit for controlling the printing of a test pattern for determining the maximum amount of ink to be ejected per unit area of ​​the medium from the print head, wherein the test pattern has a continuous region in which the ink is continuous at a set recording density and the surrounding continuous region is not ejected with respect to the length in the width direction intersecting the transport direction, and the width of the end of the continuous region that is furthest downstream or furthest upstream in the transport direction is narrower than the maximum width of the continuous region, and the control unit controls at least the print head to print the test pattern having the continuous region.

To provide a magnetic recording device capable of improving recording density by suppressing deterioration in recording quality caused by a defect on a recording medium.SOLUTION: According to an embodiment, a magnetic recording device includes a magnetic head including a disk-shaped recording medium, a recording element, a light source, a light emitting element, and a sensor, an inspection circuit configured to detect a height of a defect based on an output of the sensor, a memory configured to record the height of the defect, and a controller including a setting circuit configured to set, on a track of the recording medium having the defect, an upstream recording and reproduction prohibited sector upstream of the defect and a downstream recording and reproduction prohibited sector downstream of the defect with respect to a traveling direction of the magnetic head, the downstream recording and reproduction prohibited sector being longer than the upstream recording and reproduction prohibited sector in a track direction.SELECTED DRAWING: Figure 1

An embodiment provides a magnetic disk device and an error correction method capable of improving recording density. The magnetic disk device according to this embodiment includes: a disk; a head that writes data to the disk and reads data from the disk; and a controller that, starting from the initial read of the first track of the disk, performs error correction on a first sector that cannot be read in the first track based on first parity data corresponding to the first track.