An apparatus, according to one embodiment, includes: a plurality of tunnel valve read transducers arranged in an array extending along a read module. Each of the tunnel valve read transducers includes: a sensor structure having a cap layer, a free layer, a tunnel barrier layer, a reference layer and an antiferromagnetic layer, and electrically insulating layers on opposite sides of the sensor structure. Moreover, a height of the free layer measured in a direction perpendicular to a media bearing surface of the read module is less than a width of the free layer measured in a cross-track direction perpendicular to an intended direction of media travel.

An apparatus, according to one embodiment, includes: a plurality of tunnel valve read transducers arranged in an array extending along a read module. Each of the tunnel valve read transducers includes: a sensor structure having a cap layer, a free layer, a tunnel barrier layer, a reference layer and an antiferromagnetic layer, and electrically insulating layers on opposite sides of the sensor structure. Moreover, a height of the free layer measured in a direction perpendicular to a media bearing surface of the read module is less than a width of the free layer measured in a cross-track direction perpendicular to an intended direction of media travel.

An apparatus, according to one embodiment, includes: a module, and a plurality of tunnel valve read transducers arranged in an array extending along the module. Each of the tunnel valve read transducers includes: a sensor structure, an upper magnetic shield, a lower magnetic shield, an upper conducting spacer layer between the sensor structure and the upper magnetic shield, a lower conducting spacer layer between the sensor structure and the lower magnetic shield, and electrically insulating layers on opposite sides of the sensor structure. The sensor structure includes a cap layer, a free layer, a tunnel barrier layer, a reference layer and an antiferromagnetic layer. Moreover, a height of the free layer measured in a direction perpendicular to a media bearing surface of the module is less than a width of the free layer measured in a cross-track direction perpendicular to an intended direction of media travel.

An apparatus, according to one embodiment, includes: a module, and a plurality of tunnel valve read transducers arranged in an array extending along the module. Each of the tunnel valve read transducers includes: a sensor structure, an upper magnetic shield, a lower magnetic shield, an upper conducting spacer layer between the sensor structure and the upper magnetic shield, a lower conducting spacer layer between the sensor structure and the lower magnetic shield, and electrically insulating layers on opposite sides of the sensor structure. The sensor structure includes a cap layer, a free layer, a tunnel barrier layer, a reference layer and an antiferromagnetic layer. Moreover, a height of the free layer measured in a direction perpendicular to a media bearing surface of the module is less than a width of the free layer measured in a cross-track direction perpendicular to an intended direction of media travel.

A method for writing data from a table to a tape includes setting a number of partitions on the tape, where the number of partitions is greater than or equal to a number of columns of the table to be written to the tape, and writing data from each column of the table to at least one partition of the tape, the at least one partition including two or more wraps, the data is written from a top of the two or more wraps towards a bottom of the two or more wraps in a direction of a width of the at least one partition. The written data is reciprocated from a beginning of the tape to an end of the tape in a longitudinal direction of the tape such that writing of a last data entry of one column ends at a beginning of the two or more wraps.

The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a CH derived C concentration calculated from a CH peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.

The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a CH derived C concentration calculated from a CH peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.

An apparatus, according to one embodiment, includes: a tape head having: a write module, a read module, and a plurality of tunnel valve read transducers arranged in an array extending along the read module. Each of the tunnel valve read transducers includes: a sensor structure, an upper and lower magnetic shield, an upper conducting spacer layer between the sensor structure and the upper magnetic shield, a lower conducting spacer layer between the sensor structure and the lower magnetic shield, and electrically insulating layers opposite the sensor structure. The sensor structure includes a cap layer, a free layer, a tunnel barrier layer, a reference layer and antiferromagnetic layer. A height of the free layer measured in a direction perpendicular to a media bearing surface of the read module is less than a width of the free layer measured in a cross-track direction perpendicular to an intended direction of media travel.

An apparatus, according to one embodiment, includes: a tape head having: a write module, a read module, and a plurality of tunnel valve read transducers arranged in an array extending along the read module. Each of the tunnel valve read transducers includes: a sensor structure, an upper and lower magnetic shield, an upper conducting spacer layer between the sensor structure and the upper magnetic shield, a lower conducting spacer layer between the sensor structure and the lower magnetic shield, and electrically insulating layers opposite the sensor structure. The sensor structure includes a cap layer, a free layer, a tunnel barrier layer, a reference layer and antiferromagnetic layer. A height of the free layer measured in a direction perpendicular to a media bearing surface of the read module is less than a width of the free layer measured in a cross-track direction perpendicular to an intended direction of media travel.

A spindle speed adjusting device in machining is provided, which may include a plurality of signal detection modules, a signal capturing module and a signal processing module. Each of the signal detection modules may keep measuring the vibration signals in machining. The signal capturing module may capture the vibration signals. The signal processing module may execute a transmissibility analysis to obtain the transmissibility between the signal detection modules, and execute a frequency response fitting according to the transmissibility to obtain a plurality of system dynamic parameters, and then execute a stability lobe diagram analysis to calculate the optimized spindle speed of the machining tool so as to make the machining tool operate at the optimized spindle speed. The signal processing module may repeatedly execute the transmissibility analysis, the frequency response fitting and the stability lobe diagram analysis to keep updating the optimized spindle speed until the machining process ends.