97results about "Magnetic recording" patented technology

Provided is a dielectric thin film including a metal oxide. The metal oxide includes bismuth, sodium, barium, and titanium, at least a part of the metal oxide is a tetragonal crystal having a perovskite structure, and a (100) plane of at least a part of the tetragonal crystal is oriented in a normal direction of a surface of the dielectric thin film.

A voice coil motor (VCM) in a hard disk drive is operated in a discontinuous mode with an alternation of on and off times. A drive current to the VCM is facilitated and countered with a variable voltage across the during the on-times and off-times. The intensity of the drive current is controlled as a function of a Back ElectroMotive Force (BEMF) of the VCM. A method includes sampling during the alternation of on-times and off-times first and second values of the voltage across the VCM. The first value is sampled at a first time in response to the end of the off-time. The second value is sampled at a second time in response to the drive current of the VCM zeroing following the supply of drive current to the VCM being countered during the off-time. The BEMF is calculated as a function of first and second values.

Provided are arrangements of optical elements that combine the features of a high power, compact laser that exhibits narrow linewidth output and that does not appreciably shift in wavelength or vary in power over a wide range of temperatures. Such arrangements include a transmission filter and a Bragg reflector that select out the wavelength for which the output power of a reflective semiconductor optical amplifier (RSOA) is least affected by changes in temperature over a temperature range of interest. Such arrangements may also utilize temperature-insensitive materials.

The present disclosure generally relates to topological semi-metal (TSM) based spin-orbit torque (SOT) devices, and methods of forming a TSM layer. The TSM layer of the SOT device comprises YPtBi having a 1:1:1 stoichiometry. The YPtBi has a density between about 9.7 g / cc to about 11.2 g / cc. Kr, Ar, or Xe gas is used to sputter the YPtBi to form the YPtBi layer or film. Trace amounts of Kr, Ar, or Xe are detectable in the YPtBi layer, where the YPtBi layer comprises about 1% of Kr, Ar, or Xe. One or more targets comprising YPtBi; YPt and Bi; PtBi and Y; Y, Pt, and Bi; or YBi and Pt can be used when forming the YPtBi layer. In embodiments where two targets are used to form the YPtBi layer, different amounts of power may be applied to each target.

Various apparatuses, systems, methods, and media are disclosed for heat-assisted magnetic recording (HAMR) that includes a HAMR medium with a seed-thermal barrier structure. The seed-thermal barrier structure is positioned between a heat sink layer and a magnetic recording layer. In some examples, the seed-thermal barrier structure has a first layer including MgOTiO (MTO), a second layer including TiN on the first layer, a third layer on the second layer, and a fourth layer including MTO on the third layer. The third layer, in some examples, includes at least one of: RuAl, Pt, PtZr, PtTa, Rh, FePt, CrMo, or Cr.

Various devices, apparatuses, methods, and media for heat assisted magnetic recording (HAMR) are disclosed that, in some examples, provide HAMR media with a platinum doped CO-BN capping layer. In one example, the HAMR medium includes a CoPtBN capping layer on a magnetic recording layer having Pt in a range of 5 atomic percent (at.%) to 12 at.%. The atomic ratio of Co to Pt in the CoPtBN may be in the range of, for example, 5 to 13. The BN in the CoPtBN may comprise, for example, from 22 mol% to 30 mol% of the CoPtBN. The CoPtBN may have a face-centered cubic (FCC) crystal structure. The HAMR media may have various other layers, such as a substrate, a heat sink layer on the substrate, and a seed layer on the heat sink layer, with the magnetic recording layer on the seed layer. The seed layer may include MgO or MgO-TiO. An amorphous soft underlayer (SUL) may be provided.

Provided is a storage case and a package that reduce wear of a support surface compared to a structure that supports side surfaces of a plurality of tape cartridges with the entire support surface of the side surfaces. The storage case includes a support surface that supports side surfaces of a plurality of tape cartridges, and the support surface includes a first surface and a second surface that is located on a side closer to the side surfaces than the first surface.

To reduce an area of a circuit for detecting counter-electromotive force.SOLUTION: A current detection circuit 212 generates a current detection signal VCS depending on a drive current of a linear motor 102 to be driven. A first amplifier AMP1 amplifies the current detection signal VCS. A second amplifier AMP2 multiplies a both-end voltage VM of the linear motor 102 by a gain less than 1, and outputs the resultant. A third amplifier AMP3 generates a counter-electromotive force detection signal VBEMF depending on a difference between output VA1 of the first amplifier AMP1 and output VA2 of the second amplifier AMP2.SELECTED DRAWING: Figure 1

To provide a magnetic tape cartridge, a cartridge management system, a reading method, and a program enabling accurately reading an identifier.SOLUTION: A magnetic tape cartridge includes a case on which an identifier is displayed, and a storage medium in which reading condition information that is information regarding a condition for reading the identifier is stored.SELECTED DRAWING: Figure 8

The present disclosure relates generally to spintronic material stacks and devices. Various disclosed embodiments of YBiPt-based spin-orbit torque (SOT) stacks can be used for high-temperature applications. Disclosed herein are various buffer and / or intermediate layer configurations in spintronic stacks that can promote the growth of YBiPt in the (110) orientation to promote a high spin-Hall angle (SHA) in SOT applications. One embodiment is a spintronic stack including a buffer layer including one or more layers each individually including MgO(100), TiN(100), Ta, Nb, HfN, Ta3W2(110), TaW2(100), Ta3W2N, TaW2N, or YBiPt; an SOT layer including YBiPt with a (110) orientation; an intermediate layer including one or more of MgO, Ta3WN, TaW3N, Ta3W(110), TaW3(100), YPt(110), NiFeGeN, NiAlN, NiAl, NiFeGe, NiAlGe, or HfN; and a ferromagnetic layer.

The present disclosure generally relates to topological semi-metal (TSM) and topological insulator (Tl) based spin-orbit torque (SOT) devices and a method of forming thereof. Tl or TSM-based SOT device (such as that with BiSb in the SOT layer) has been proposed for applications in magnetic switching and sensor applications, where current flows in a CIP (current-in-plane) or CPP (current-perpendicular-to-the-plane) direction, respectively. For CPP SOT devices, the requirement for the Tl or TSM layer's bulk property is to be more insulating, to minimize shunting. However, for CIP SOT devices, the requirement for the Tl or TSM layer's bulk property is to be more conductive, for less power consumption. Disclosed herein are various embodiments covering types and amounts of dopants for the Tl or TSM layer, to decrease the bandgap of the Tl or TSM layer for CIP SOT devices, thereby increasing the bulk conductivity for lower power consumption.

To provide a magnetoresistance effect element with a large MR ratio.SOLUTION: A magnetoresistance effect element comprises a first ferromagnetic layer, a second ferromagnetic layer, and a non-magnetic layer. The first ferromagnetic layer includes a first layer and a second layer. The first layer is arranged closer to the non-magnetic layer than the second layer. The first layer contains a heusler alloy which is at least partially crystallized. The second layer includes a ferromagnetic body which is at least partially crystallized, unlike the heusler alloy. The first layer and the second layer include a first atom added. The first atom is one selected from the group consisting of Mg, Al, Cr, Mn, Ni, Cu, Zn, Pd, Cd, In, Sn, Sb, Pt, Au, and Bi.SELECTED DRAWING: Figure 1

Provided is a disk device, a control method for a disk device, and a program, which enable a rotational latency to be minimized to access a next logical block address (LBA) regardless of which head is used for access in a disk device having a plurality of heads. The disk device of an embodiment includes a storage unit that stores a table in which a track skew value for each head is stored, and a control unit that reads out a track skew value corresponding to a head that is an object of operation from the table and performs track control.

A hard disk drive includes a heat-assisted magnetic recording head and an enclosure. The enclosure is configured to contain the heat-assisted magnetic recording head and other components of the hard disk drive. The enclosure includes a base and a thermally processed top cover including a thermally oxidized interior surface. Preferably, a composition of the thermally oxidized surface of the thermally processed top cover comprises at least 5 percent oxygen. More preferably, an average oxidation depth of the thermally oxidized surface of the thermally processed top cover is at least 8 nanometers.

This disclosure generally relates to the design of a spin-orbit torque (SOT) differential reader. The SOT differential reader is a multi-terminal device comprising a first shield, a first spin Hall layer, a first free layer, a gap layer, a second spin Hall layer, a second free layer, and a second shield. The gap layer serves as an electrode and is disposed between the first and second spin Hall layers. Electrical lead connections are located around the first spin Hall layer, the second spin Hall layer, the gap layer, the first shield, and / or the second shield. These lead connections facilitate the flow of current from the negative lead to the positive lead and / or the voltage from the negative lead to the positive lead. The positioning of these lead connections and the positioning of the SOT differential layers improve the reader resolution without reducing the shield-to-shield spacing (i.e., the read gap).

To provide a cartridge management device, a cartridge management system, an operation method of the cartridge management device, and a program that can inhibit unauthorized reuse of a magnetic tape cartridge.SOLUTION: When no registered information indicating that a cartridge has been registered in a cartridge management system is stored in a cartridge memory provided in the cartridge, a library controller equipped with a storage performs first registration processing for registering the identification information identifying the cartridge and the registered information in the cartridge memory, overwrite prohibition processing for prohibiting overwriting the identification information and the registered information registered in the cartridge memory, second registration processing for registering the identification information in the storage, and execution processing to read and write user data to and from the cartridge when the identification information stored in the storage and the identification information stored in the cartridge memory match.SELECTED DRAWING: Figure 11

Provided are an insulating-coated soft magnetic powder capable of being heat-treated at high temperatures and having a low coercive force and a high insulation resistance value between particles, a compacted magnetic core, a magnetic component, an electronic device, and a moving body. The insulating-coated soft magnetic powder is characterized by having: a core particle having a base portion and an oxide film, the base portion containing a soft magnetic material mainly composed of Fe and containing at least one of Si, Cr, and Al, the oxide film being provided on the surface of the base portion and containing an oxide of at least one of Si, Cr, and Al; and an insulating coating film provided on the surface of the core particle and containing a ceramic, the thickness of the insulating coating film being 5 nm or more and 300 nm or less, and at the interface between the oxide film and the insulating coating film, mutual diffusion occurs between the oxide contained in the oxide film and the ceramic contained in the insulating coating film.

A hard disk drive includes multiple disk media mounted on a spindle, where the outer diameter of each disk medium is offset from the inner diameter of the disk medium in a same direction along an axis of rotation of the spindle, and a load / unload ramp positioned, based on the offset, to align in correspondence with the outer diameters of the disk media. Thus, the curvature of irregular disk media, such as that associated with thinner and thinner disks, is mitigated by grouping similarly-characterized irregular disks together on a given spindle and compensating the ramp accordingly.

A magnetic recording medium is described that includes a substrate and an amorphous soft underlayer (SUL). A Ni-Pt seed layer is formed on the SUL in which Pt atoms have substituted at least some of the Ni atoms within the Ni lattice structure of Ni-Pt to form a solid solution of Ni-Pt. In some examples, the Ni-Pt seed layer is formed from Ni40Pt60. A Ru intermediate layer is formed on the seed layer. In some examples, the lattice mismatch of the Ni-Pt seed layer and the Ru intermediate layer is 0.4% or less. A magnetic recording layer is formed on the Ru intermediate layer. Additional layers or films may be provided. The media may be configured for use with perpendicular magnetic recording (PMR). A data storage device is described that includes the magnetic recording medium. Methods for manufacturing the magnetic recording media are also described herein.

To improve accuracy of current detection.SOLUTION: An A / D converter converts an error signal VERR based on an error between a current feedback signal VFB and a reference signal VDAC into a digital signal DERR at the timing of an S / H signal. In a first mode, a compensator uses a value A1 of the error signal captured by the A / D converter at the timing of a negative edge of a first pulse PWMA as a value A1' of the error signal at the timing of a positive edge of a second pulse PWMB.SELECTED DRAWING: Figure 4

The invention discloses magnetic tape unit equipment, a storage system, a control method of a magnetic head and a controller, and relates to the technical field of magnetic tapes. A plurality of magnetic heads are arranged in the magnetic tape unit. Therefore, by providing the redundant magnetic head, the service life of the magnetic head in the magnetic tape unit equipment can be prolonged, and the service life of the magnetic tape unit equipment is further prolonged. And in the magnetic head cleaning treatment process, the first magnetic head or the second magnetic head in the multiple magnetic heads is driven by the magnetic head driver to access the magnetic tape, so that the data access function can still be provided in the magnetic tape unit equipment, and the data access service does not need to be interrupted.

To provide an alkali-free glass substrate that enables easy removal of bubbles included in molten glass under a reduced-pressure atmosphere.SOLUTION: An alkali-free glass substrate contains, as represented by mass% based on oxides: SiO2: 54-68%, Al2O3: 10-25%, B2O3: 1.8-5.5%, and MgO+CaO+SrO+BaO: 8-26%. The alkali-free glass substrate has β-OH of 0.15 to 0.32 mm-1, and a Cl content of 0.15 to 0.25 mass%. A bubble growth index I of the alkali-free glass substrate given by the following formula is 320 or more: I=590.5×[β-OH]+874.1×[Cl]-5.7×[B2O3]-33.3. In the formula, [β-OH] is β-OH (mm-1) of the alkali-free glass substrate, [Cl] is the Cl content (mass%) of the alkali-free glass substrate, and [B2O3] is a B2O3 content (mass%) of the alkali-free glass substrate.SELECTED DRAWING: None

Disclosed are sealed enclosure HAMR hard drives, and methods for use therewith, that reduce the rate of depletion of gaseous Oxygen within the sealed HAMR drive enclosure, thereby leaving an amount of Oxygen available for mitigation of the effects of carbonaceous residue formation, thus extending the useful life of the HAMR drive. In sealed enclosure HAMR hard drives that include a component having a NdFeB alloy magnet, the sealed enclosure is filled with a gas mixture that includes primarily Helium along with a sufficient amount of Oxygen to mitigate carbonaceous residue formation during the lifetime of the drive and a sufficient amount of Nitrogen to reduce the rate of Oxygen depletion due to oxidation of the NdFeB magnet.

A hard disk drive includes: a plurality of disk media mounted on a main shaft in which an outer diameter of each disk media is offset from an inner diameter of the disk media in the same direction along a rotation axis of the main shaft; and a load / unload ramp positioned to align correspondingly with the outer diameter of the disk media based on the offset. Thus, curvature of irregular disk media, such as curvature associated with thinner and thinner disks, is mitigated by grouping similarly characterized irregular disks together on a given principal axis and compensating for ramps accordingly.

A method of manufacturing a magnetic device, the method comprising: Forming a stack structure (40; 50; 250), wherein the stack structure (40; 50; 250) comprises a non-volatile metal layer; and Etching the stack structure (40; 50; 250) comprising the non-volatile metal layer with an etching gas containing at least 80% by volume of H2 gas, wherein the method further comprises exposing a region of the stack structure (40; 50; 250) to a hydrogen plasma prior to etching the stack structure (40; 50; 250).

Various apparatuses, devices, methods, and media are disclosed for heat-assisted magnetic recording (HAMR) that, in some examples, provide a HAMR medium with a platinum-doped CO—BN capping layer. In one example, the HAMR medium includes a CoPtBN capping layer on a magnetic recording layer with Pt in the range of 5-12 atomic percentage (at. %). An atomic ratio of Co to Pt within the CoPtBN may be, e.g., in the range of 5 to 13. The BN in the CoPtBN may be, e.g., 22-30 mole percentage of the CoPtBN. The CoPtBN may have a face-centered cubic (FCC) crystalline structure. The HAMR medium may have various other layers, such as a substrate, a heatsink layer on the substrate, and a seed layer on the heatsink layer, with the magnetic recording layer on the seed layer. The seed layer may include MgO or MgO—TiO. An amorphous soft underlayer (SUL) may be provided.

To provide a disk device capable of improving the degree of freedom of design.SOLUTION: A disk device according to one embodiment includes a plurality of magnetic disks, a spindle motor, a housing, a first substrate, and a first connector. The magnetic disks are arranged in an axial direction along a first rotation axis. The spindle motor rotates the magnetic disk. The housing has a first wall provided therein with a space housing the magnetic disk and the spindle motor, to which the spindle motor is attached, and a second wall projecting from the first wall and surrounding the space. The first substrate is attached to the outer surface of the second wall facing the outside of the space. The first connector is attached to the first substrate. The diameter of the magnetic disk is 80 mm or more and 100 mm or less. The maximum dimension of the housing in the axial direction is 26.2 mm or more.SELECTED DRAWING: Figure 1

Provided is an alkali-free glass plate having a sufficiently high strain point and Young's modulus, together with excellent productivity.　The alkali-free glass plate is characterized by containing as the glass composition, in mol%, SiO2 63-70%, Al2O3 10-15%, B2O3 3-8%, Li2O+Na2O+K2O 0-0.5%, MgO 1-11%, CaO 2-11%, SrO 0-6%, BaO 0-8%, and MgO+CaO+SrO+BaO 13-20%, by the mol% ratio SiO2 / Al2O3 being 4.2-7, and by the mol% ratio (MgO+CaO+SrO+BaO) / Al2O3 being 0.9-2.

The application discloses a magnetic recording device, a multi-state disk and a read-write method, and belongs to the field of magnetic storage. The magnetic recording device comprises a substrate and a magnetic recording film above the substrate. The magnetic recording film is circular and comprises three ferromagnetic layers separated by two non-magnetic intermediate layers. The easy magnetization directions of the three ferromagnetic layers are along the x, y and z directions respectively. The z direction is the vertical direction, and the x and y directions are in-plane directions and are along the radial direction and the tangential direction respectively. The multi-state disk comprises the magnetic recording device, a read head, a write head and magnetic shielding layers on both sides of the read head. The write head comprises a vertical magnetic pole and two pairs of horizontal magnetic poles, and coils wound on the magnetic poles. The read head comprises a spin current generation layer and a film layer structure (a magnetic tunnel junction, a spin valve or a Hall bar). The application can improve the storage density of the magnetic recording device, thereby greatly improving the storage density of the disk based on the magnetic recording device.