62 results about "Magnetic dots" patented technology

A magnetic recording medium having magnetic dots that can achieve high density recording is disclosed. The magnetic recording medium comprises at least an underlayer, a magnetic recording layer, and a protective layer sequentially laminated on a nonmagnetic substrate. The underlayer is composed of ruthenium or an alloy of mainly ruthenium and has an undulating structure formed with ridge lines in a predetermined pitch on the surface of the underlayer. The magnetic recording layer contains at least ferromagnetic crystal grains and a nonmagnetic component. Magnetic dots composed of crystal grains with a grain size not smaller than 4 nm in the magnetic recording layer are aligned on a surface of the underlayer along the ridge line, and each of the magnetic dots s separated by the nonmagnetic component from each other. A simple manufacturing method for this medium also is disclosed.

A bit patterned media (BPM) includes many magnetic dots arranged in tracks on a substrate. The magnetic dots each have a hard magnetic core, a soft magnetic cladding surrounding the core and a thin non-magnetic layer that separates the hard magnetic core from the soft magnetic ring. The soft magnetic cladding stabilizes the magnetization at the edges of the hard magnetic core to improve the signal to noise ratio of the magnetic dots. The soft magnetic rings also narrow the magnetic field of the dots which reduces the space requirements and allows more dots to be placed on the substrate.

A perpendicular magnetic recording medium has a substrate, a soft magnetic underlayer formed on the substrate, arrayed soft magnetic dots formed on the soft magnetic underlayer, and a ferromagnetic recording layer formed on the soft magnetic dots and having magnetic anisotropy in a direction perpendicular to a surface of the substrate.

A process for fabricating a patterned medium including a dot-forming step for forming a dot array constituted by sample magnetic dots having a predetermined size such as a single domain particle size determined theoretically from the magnetic metal thin for a sample medium having a magnetic metal film formed with the initial conditions; a demagnetization step for AC-demagnetizing the dot array; a ratio measurement step for measuring the ratio of single magnetic domains by observing the magnetic pattern of each of the sample dots after the AC-demagnetization; and an adjustment step for determining conditions of the sputtering apparatus for forming a solid state magnetic metal thin film by adjusting the film-forming conditions such that the ratio of the single magnetic domains equals to or exceeds a predetermined value.

The invention discloses a self-netting type scattered-point internal vibration ball for concrete pouring, and belongs to the field of construction technology. The self-netting type scattered-point internal vibration ball can be put in a concrete pouring process so as to replace the traditional concrete vibrator for concrete pouring without actual operation by technicians at a site. Compared with aconcrete vibrator, the self-netting type scattered-point internal vibration ball is in the concrete, and high-quality vibration is carried out to the concrete by moisture in the concrete and the high-frequency vibration caused by the decomposing reaction of a water disintegration vibration ball; meanwhile, a large number of tiny bubbles can be released during the disintegration, the tiny bubblescan be used as an air-entraining agent to improve the peaceability, water-retaining property and cohesiveness of a concrete mixture and improve the flowability of the concrete, and after the vibrationis finished, the tiny bubbles can extend in the concrete by a released self-hardening netting vibration transmission rod; and a high-strength adhesion is established by a double magnetic dot ball, areinforcing net is formed in the concrete, and the forming strength of the concrete is significantly improved through cooperating with an internal vibration sphere.

According to one embodiment, there is provided a magnetic recording medium having a data region in which a plurality of recording tracks, each including magnetic dots arrayed in a down-track direction with a pitch p, are formed in a cross-track direction, and a servo region including a preamble in which a plurality of lines of magnetic dots, which are arrayed in a cross-track direction with a pitch p, are formed at equal intervals in the down-track direction.

A UNLV novel electric / magnetic dot sensor includes a loop of conductor having two ends to the loop, a first end and a second end; the first end of the conductor seamlessly secured to a first conductor within a first sheath; the second end of the conductor seamlessly secured to a second conductor within a second sheath; and the first sheath and the second sheath positioned adjacent each other. The UNLV novel sensor can be made by removing outer layers in a segment of coaxial cable, leaving a continuous link of essentially uncovered conductor between two coaxial cable legs.

A digitized encryption method for a fiber paper making process based on dot patterns comprises the following steps: adding magnetic fiber during a pulping process, and utilizing a magnetic dot code controller to control dot codes to act on the magnetic fiber in pulp during a pulp flowing process, so as to form magnetic dot patterns in paper, wherein the magnetic dot code controller is arranged above a mesh part, and comprises an input module, a conversion module, a storage module and a processing module; the input module and the conversion module are connected with each other, so as to input the dot patterns; the conversion module and the storage module are connected with each other to convert the input dot patterns into 16 * 16 dot data; and the processing module and the storage module are connected with each other to control the magnetic property of corresponding dots on the magnetic dot code controller. According to the invention, the interior of the paper is encrypted magnetically during a paper making process, so that people cannot see the interior of the paper visually, and scanning and duplication are avoided; and stored information is converted into dot codes during the encryption process, so that the data can be stored in the paper.

According to one embodiment, there is provided a magnetic disk apparatus having a magnetic disk having magnetic dot lines each including magnetic dots arrayed at equal intervals in a down track direction, and a read / write head which uses a plurality of adjacent magnetic dot lines as one track and sequentially performs read and write on the magnetic dots included in the magnetic dot lines constituting the track, in which the magnetic dots included in each of the magnetic dot lines in each track of the magnetic disk are displaced in the down track direction from the magnetic dots included in the adjacent dot line in the track depending on a possible skew angle between the read / write head and the track so that the magnetic dots are sequentially accessed by the read / write head.

The present invention provides a magnetic recording medium having magnetic dots that can achieve high density recording is disclosed. The magnetic recording medium comprises at least an underlayer, a magnetic recording layer, and a protective layer sequentially laminated on a nonmagnetic substrate. The underlayer is composed of ruthenium or an alloy of mainly ruthenium and has an undulating structure formed with ridge lines in a predetermined pitch on the surface of the underlayer. The magnetic recording layer contains at least ferromagnetic crystal grains and a nonmagnetic component. Magnetic dots composed of crystal grains with a grain size not smaller than 4 nm in the magnetic recording layer are aligned on a surface of the underlayer along the ridge line, and each of the magnetic dots s separated by the nonmagnetic component from each other. A simple manufacturing method for this medium also is disclosed.

Aimed at is to match a timing of a clock signal with a magnetic dot of a patterned medium. A magnetic part (16) arraying magnetic dots (15) for recording a magnetic signal at certain intervals and a nonmagnetic part (17) not recording a magnetic signal are featured in the patterned medium. A position of the nonmagnetic part(17) not recording a magnetic signal is detected by a magnetic head and a clock signal is synchronized with a detection signal of the nonmagnetic part.

According to one embodiment, a disk drive that includes a disk and a disk controller is provided which effectively correct data errors that are generated at the time of reproducing data. The disk has a data-recording area constituted by a set of magnetic dots that are physically separated from one another. The disk controller uses error-correcting codes to determine an error that shows a change in the total number of bits in a data-bit string of the data set reproduced.

A patterned magnetic recording medium, accessible by a magnetic recording head, including a plurality of tracks, a width direction of each track and that of the magnetic recording head being of a skew angle. The patterned magnetic recording medium includes a plurality of magnetic dots, each corresponding to a recording bit, formed on a non-magnetic material. The plurality of magnetic dots are arranged in a plurality of arrays, each array corresponding to one of the tracks. Every N adjacent magnetic dots of the array define a polygon, one side thereof being parallel to the corresponding track, and another side thereof being parallel to a direction corresponding to the skew angle of the corresponding track.