摘要:
A perpendicular magnetic recording (PMR) disk used in energy assisted magnetic recording drives is described. The PMR disk includes a substrate, a magnetic recording layer disposed above the substrate, an exchange coupling layer disposed above the magnetic recording layer, and a capping layer disposed above the exchange coupling layer. The capping layer has a Curie temperature greater than the Curie temperature of the magnetic recording layer.
摘要:
A perpendicular magnetic recording write head that a write pole, an electrically conductive coil coupled to the write pole for generating magnetic flux in the write pole in the presence of electrical write current, and a spin torque oscillator (STO) that injects auxiliary magnetic flux to the write pole in a direction generally orthogonal to the write pole to facilitate magnetization switching of the write pole. The STO comprises a stack of layers including electrodes, a pinned ferromagnetic layer having a fixed, a free ferromagnetic layer having a magnetization free to rotate, and a nonmagnetic spacer layer between the pinned and free layers. The free layer may be oriented either substantially orthogonal to the write pole or substantially parallel to the write pole, in which latter embodiment a flux guide may be located between the free layer and the write pole for directing the auxiliary magnetic flux from the free layer to the write pole.
摘要:
A plant (1;20) for transferring cargo (23) to and from a ship (24), said plant comprising an elevated rail structure (2) and a crane unit (3) where the elevated rail structure (2) is arranged on one side of the ship (24) and comprises a longitudinal rail (6) which extends essentially parallel to the longitudinal axis of the ship and where the crane unit is arranged to transfer a load or a group of loads to and from said ship, is supported by said longitudinal rail and is displaceable along said longitudinal rail. The crane unit furthermore comprises a boom (10) and a trolley (21) where the boom of said crane unit extends essentially perpendicular to the longitudinal rail such that one end of the boom extends over the ship; and where the boom of said crane unit comprises a transverse rail (13) which extends in a direction which is essentially transverse to the longitudinal rail and essentially parallel to the centre line of the boom. The trolley is displaceably connected to said transverse rail of said boom and the trolley of said crane unit comprises a lifting device (22) for lifting said load or said group of loads. Furthermore, the transverse rail (13) of said boom (10) is arranged underneath said longitudinal rail (6) of said elevated rail structure (2). In this way, the trolley can move back and forth along the transverse rail without any hindrances.
摘要:
The present invention automates the publishing of financial, legal, and governmental documents and any other publications that are structured and require compliance with corporate or external standards and may share content elements. It gives users control in an always-on, familiar environment: the Internet. Due to its virtual document architecture and ability to operate over the Internet and intranets, the system facilitates collaborative work and traces accountability. The key concept behind automating publishing is to control scheduling and costs by better content management. The present invention handles document content as small, reusable components, down to the paragraph and table cell level. The interface helps users assemble documents from these version-controlled components with automated support. The system applies context and filtering criteria stored with each component to locate and apply content fragments to a current document. The system of the present invention can apply structural rules and content requirements to ensure compliance with regulatory requirements and company business rules. A working virtual document within the system always incorporates the current version of all constituent elements.
摘要:
An interconnect between the write driver and the write head in a magnetic recording disk drive enables an inherent write current overshoot. The interconnect includes an integrated lead suspension (ILS) and a short flex cable that connects the write driver circuitry to the ILS. The interconnect is a two-segment transmission line, with the first segment connected to the write driver having multiple sub-segments or sections with non-uniform impedance levels. The section of the first segment that connects to the write driver is the short flex cable and has an impedance substantially higher than the source impedance ZWD of the write driver. The multiple sections of the first segment have non-uniform impedance values that have an effective impedance Z01-eff that substantially matches ZWD. The second segment of the transmission line has an effective impedance Z02-eff that is substantially less than Z01-eff. The write lines for the +W and −W signals are preferably interleaved on the transmission line sections.
摘要:
A perpendicular magnetic recording write head that a write pole, an electrically conductive coil coupled to the write pole for generating magnetic flux in the write pole in the presence of electrical write current, and a spin torque oscillator (STO) that injects auxiliary magnetic flux to the write pole in a direction generally orthogonal to the write pole to facilitate magnetization switching of the write pole. The STO comprises a stack of layers including electrodes, a pinned ferromagnetic layer having a fixed, a free ferromagnetic layer having a magnetization free to rotate, and a nonmagnetic spacer layer between the pinned and free layers. The free layer may be oriented either substantially orthogonal to the write pole or substantially parallel to the write pole, in which latter embodiment a flux guide may be located between the free layer and the write pole for directing the auxiliary magnetic flux from the free layer to the write pole.
摘要:
A method for controlling proximity of a read element of a perpendicular-magnetic-recording (PMR) head to a PMR disk. The method includes: a) writing recorded data with a write element of the PMR head to the PMR disk; b) providing a proximity-control setting to a proximity-control element; c) positioning the read element of the PMR head with the proximity-control element as determined by the proximity-control setting in communication with the PMR disk for reading recorded data back from the PMR disk; d) measuring a resolution of a read-back signal of recorded data on the PMR disk associated with the proximity-control setting; e) determining if the resolution measured for the read-back signal of recorded data on the PMR disk satisfies a criterion for the resolution of the read-back signal of recorded data; and, f) changing the proximity-control setting, and repeating b), c), d) and e), unless the resolution satisfies the criterion.
摘要:
A method for selectively choosing the magnetic properties of a sputter deposited recording layer of a magnetic recording medium comprises sputtering a target of metal underlayer material onto a substrate to deposit an underlayer film and selectively collimating the sputtered underlayer particles to vary the arrival energy and angular distribution of the sputter particles striking the substrate to selectively establish the orientation of the crystals making up the underlayer film. A magnetic metal film is then sputter deposited upon the underlayer film to form a magnetic recording layer, the magnetic metal film having a crystal texture and recording properties affected by the orientation of the crystals in the underlayer film. The magnetic properties of the magnetic recording layer are chosen by selectively collimating while sputter depositing the underlayer material. In an alternative embodiment of the present invention, both the underlayer film and the magnetic metal recording film are selectively collimated when deposited upon the substrate. A still further embodiment of the invention includes selectively collimating only the magnetic metal recording film.
摘要:
A disk drive is disclosed comprising a head actuated over a disk, wherein the head comprises a laser for heating the disk while writing data to the disk. The disk drive receives write commands, and increases a power of the laser to a write power for heating the disk while writing data to the disk. A calibration interval is adjusted based on the power applied to the laser over time, and the write power is calibrated at the calibration interval.
摘要:
A disk drive is disclosed comprising a head actuated over a disk, wherein the head comprises a laser for heating the disk while writing data to the disk. The disk drive receives write commands, and increases a power of the laser to a write power for heating the disk while writing data to the disk. A calibration interval is adjusted based on the power applied to the laser over time, and the write power is calibrated at the calibration interval.