16results about "Materials with iron" patented technology

The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a contact angle with water, which is measured on a surface of the magnetic layer, is 95° or more and 105° or less, and standard deviation σ of the contact angle in a width direction of the surface of the magnetic layer is 1.0° or less.

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 magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a friction coefficient measured on a base portion of a surface of the magnetic layer is 0.35 or less, and standard deviation σ of the friction coefficient in a width direction of the surface of the magnetic layer is 0.05 nm or less.

Provided is a magnetic recording medium with which a decrease in electromagnetic conversion characteristics can be suppressed.　This magnetic recording medium has a tape shape and comprises a base body including a polyester, an underlayer provided on the base body, and a magnetic layer provided on the underlayer and containing a magnetic powder. The magnetic recording medium includes a lubricant. The arithmetic average roughness Ra of the surface of the magnetic layer is 1.3 nm or less. In a case where, when the magnetic recording medium is caused to slide on the glass-made simulated head, the average value of peak half-widths in a space increase region generated on an inlet side of a glass-made simulated head to which the magnetic recording medium is inserted is defined as a space index SRL, and when the magnetic recording medium is caused to slide on the glass-made simulated head, the average value of peak half-widths in a space increase region generated in the vicinity of a widthwise edge of the magnetic recording medium is defined as a space index SRT, the space index SRL is 35 μm or less, and the space index SRT is 68 μm or less.

Provided is a magnetic recording medium capable of curbing deterioration in electromagnetic conversion characteristics.A magnetic recording medium with a tape shape includes a substrate that contains polyesters, an underlayer that is provided on the substrate, and a magnetic layer that is provided on the underlayer and contains a magnetic powder. The magnetic recording medium contains a lubricant. An average value of arithmetic average roughnesses Ra of a surface of the magnetic layer is 1.3 nm or less. In a case where an average value of peak half widths of a spacing increase region generated on an entrance side of a glass pseudo head which the magnetic recording medium enters when the magnetic recording medium is slid over the glass pseudo head is set as a spacing index SRL and an average value of peak half widths of a spacing increase region generated in the vicinity of an edge of the magnetic recording medium in a width direction when the magnetic recording medium is slid over the glass pseudo head is set as a spacing index SRT, the spacing index SRL is 35 μm or less and the spacing index SRT is 68 μm or less.

A magnetic recording tape comprises a tape substrate, a perpendicular magnetic recording layer disposed over the tape substrate, and a soft-magnetic underlayer disposed between the recording layer and the tape substrate. The perpendicular magnetic recording layer comprises magnetic particles suspended in a binder material, and the soft-magnetic underlayer comprises a continuous film of soft-magnetic material. The magnetic particles in the recording layer comprise one of barium ferrite, strontium ferrite, epsilon iron oxide and chromium dioxide. Tape storage apparatus employing such tape is also provided. The apparatus comprises a read / write head having at least one probe write-head for writing data by perpendicular recording on magnetic tape, at least one reel of magnetic tape as defined above, and a tape transport mechanism for transporting the magnetic tape past the read / write head.

The present invention is directed to providing a magnetic recording medium substrate having high heat resistance. The magnetic recording medium substrate includes an aluminum alloy substrate and a nickel alloy film disposed on at least one main surface of the aluminum alloy substrate, wherein the nickel alloy film comprises 0.5 wt% to 3 wt% Mo, 11 wt% to 15 wt% P, and 0.0001 wt% to 0.001 wt% Fe.

To provide a magnetic tape that can record and / or reproduce data excellently with a dimension in a width direction of the magnetic tape controlled by adjusting a tension to be applied in a longitudinal direction of the magnetic tape.SOLUTION: One embodiment of the present invention is a magnetic tape that satisfies TDSage+TDSenv-TC≤0.30 μm. One embodiment of the present invention is a magnetic tape cartridge and a magnetic tape device that include the magnetic tape. The TDSage is a maximum value of an absolute value of a differential between the servo band interval obtained prior to a prescribed storage and the servo band obtained after the storage. The TDSenv is a value to be calculated by multiplying a differential between a maximum value and minimum value in the servo band intervals obtained respectively under prescribed five environments with 1 / 2. The TC is a value to be calculated by multiplying TDStens with 0.5N, in which the TDStens is a ratio of a change in servo band interval with respect to a change in tension to be calculated from respective servo band intervals obtained respectively under the prescribed five environments by applying a plurality of different tensions in a longitudinal direction of the magnetic tape.SELECTED DRAWING: None

The invention belongs to the technical field of magnetic recording media, and particularly relates to a magnetic recording medium with an oxidized seed crystal layer, which solves the problems of insufficient thermal stability and insufficient response characteristic in the prior art, and comprises oxidized nickel phosphorus NiP or oxidized nickel aluminum NiAl, the oxidized NiP contains at least one doping element X of which the oxidation potential is higher than that of the NiP, through dense component design and an innovative oxidation process, an oxidized NiP-Al seed crystal layer medium system with excellent crystal orientation and thermal stability is constructed, and the performance of the magnetic recording medium is remarkably improved. According to the system, a NiP-Al alloy seed crystal layer is prepared by adopting a magnetron co-sputtering technology, and a gradient oxidation structure is formed through a two-stage heat treatment process, so that abnormal growth of nickel-phosphorus grains is effectively inhibited, and the grain size is stabilized below 12nm. By matching with an optimized layered structure, a high signal-to-noise ratio SNRgt is shown; and the coercive force attenuation rate is only 4.2% in 1000 hours in an environment of 85 DEG C / 85% RH (Ruhrstahl Heraeus).

Provided is a magnetic tape that is a data tape wherein the arithmetic mean peak curvature Spc as defined in ISO 25178 of the surface of a magnetic layer is 0.30–0.70 (1 / μm), the standard deviation σ of the Spc in the width direction of the surface of the magnetic layer is no more than 0.15 (1 / μm), and a leader pin is directly attached to an end part.

To provide a magnetic tape which may contribute to operational stability improvement of a drive during recording and / or reproduction after prolonged storage.SOLUTION: A magnetic tape is provided, comprising a non-magnetic support body and a magnetic layer containing ferromagnetic powder and having a friction coefficient of 0.35 or less as measured on a base material portion of a surface thereof and a standard deviation σ of the friction coefficient of 0.05 or less in a width direction of the surface thereof. Also provided are a magnetic tape cartridge and a magnetic tape device that comprise the magnetic tape.SELECTED DRAWING: None

A magnetic recording tape includes a tape substrate, a perpendicular magnetic recording layer disposed on the tape substrate, and a soft magnetic backing layer disposed between the recording layer and the tape substrate. The perpendicular magnetic recording layer includes magnetic particles suspended in an adhesive material, and the soft magnetic backing layer includes a continuous film of soft magnetic material. The magnetic particles in the recording layer include one of barium ferrite, strontium ferrite, epsilon iron oxide, and chromium dioxide. A tape storage device using such a tape is also provided. The device includes a read / write head having at least one probe write head for writing data to the magnetic tape by perpendicular recording, at least one reel of the magnetic tape described above, and a tape transport mechanism for transporting the magnetic tape past the read / write head.

An object of the present invention is to provide a magnetic recording medium capable of containing magnetic particles having a fine crystal grain size on the surface layer and in the vicinity thereof of a magnetic recording layer. The magnetic recording medium according to the present invention includes a substrate and a magnetic recording layer containing magnetic particles having an L10 structure, the magnetic recording layer is (001)-oriented, the growth surface of the magnetic recording layer has a (001) plane, a (111) plane, and equivalent planes thereof, and the area ratio of the (111) plane and the equivalent planes thereof in the growth surface (((111) plane + (111) equivalent planes) / ((001) plane + (111) plane + (111) equivalent planes)) is 0.2 to 0.7.

To provide a magnetic tape which may contribute to operational stability improvement of a drive during recording and / or reproduction after prolonged storage.SOLUTION: A magnetic tape is provided, comprising a non-magnetic support body and a magnetic layer containing ferromagnetic powder and having a water contact angle in a range of 95° to 105°, inclusive, as measured on a surface thereof and a standard deviation σ of the water contact angle of 1.0° or less in a width direction of the surface thereof. Also provided are a magnetic tape cartridge and a magnetic tape device that comprise the magnetic tape.SELECTED DRAWING: None

The invention discloses a high-recording-density magnetic medium based on exchange coupling and a preparation method of the high-recording-density magnetic medium. The high-recording-density magnetic medium comprises a first soft magnetic layer, a hard magnetic layer, a second soft magnetic layer, a non-magnetic supporting body and a back coating layer which are sequentially stacked. The soft magnetic layers are added above and below the magnetic recording layer, so that soft magnetic particles and hard magnetic recording particles can be in proper exchange coupling strength; when a reversal field is applied, the soft magnetic part firstly rotates, and the hard magnetic part is helped to reverse through exchange coupling, so that the required reversal field can be reduced; the exchange coupling medium can maintain good thermal stability while reducing the coercive force because the exchange coupling effect can stabilize magnetization and improve the energy barrier, thereby preventing the magnetization state from spontaneously overturning at high temperature; on the other hand, by optimizing the coupling strength of the soft magnetic layer and the hard magnetic layer, the exchange coupling magnetic recording medium can improve the signal-to-noise ratio, reduce the read noise and improve the reliability of the stored data.

A magnetic tape in which an arithmetic average roughness Ra measured at a surface of the magnetic layer with an atomic force microscope is 2.0 nm or less, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value45° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.