Abstract: A magnetic head disposed in a slider, that is arranged at an interval from a magnetic disk includes a sensor disposed in a position that is opposed to the magnetic disk, a heat conductive film that is positioned on an air bearing surface opposed to the magnetic disk, and that is formed so as to overlap the sensor, of which a height in a direction perpendicular to the air bearing surface is more than a height of the sensor, and that transfers a temperature change of the air bearing surface to the sensor, and a pair of lead films electrically connected to the sensor and not electrically connected to the heat conductive film.

Abstract: For obtaining a flying height of a magnetic head from a magnetic disk, the magnetic head being placed in a slider arranged at an interval with the magnetic disk, an initial setting process and a flying height detecting process are performed. In the initial setting process, driving power to a heater is increased gradually, from a state where the heater arranged at a position in proximity to the magnetic head in the slider is not driven, until the magnetic head makes contact with the magnetic disk. Then, in each stage, an electrical resistance value of the sensor arranged at a position in proximity to the magnetic head in the slider, which is increased due to the heat from heater, and either an approach distance of the magnetic head toward the magnetic disk or the flying height of the magnetic head from the magnetic disk are acquired.

Abstract: A magnetic head disposed in a slider, that is arranged at an interval from a magnetic disk includes a sensor disposed in a position that is opposed to the magnetic disk, a heat conductive film that is positioned on an air bearing surface opposed to the magnetic disk, and that is formed so as to overlap the sensor, of which a height in a direction perpendicular to the air bearing surface is more than a height of the sensor, and that transfers a temperature change of the air bearing surface to the sensor, and a pair of lead films electrically connected to the sensor and not electrically connected to the heat conductive film.

Abstract: For obtaining a flying height of a magnetic head from a magnetic disk, the magnetic head being placed in a slider arranged at an interval with the magnetic disk, an initial setting process and a flying height detecting process are performed. In the initial setting process, driving power to a heater is increased gradually, from a state where the heater arranged at a position in proximity to the magnetic head in the slider is not driven, until the magnetic head makes contact with the magnetic disk. Then, in each stage, an electrical resistance value of the sensor arranged at a position in proximity to the magnetic head in the slider, which is increased due to the heat from heater, and either an approach distance of the magnetic head toward the magnetic disk or the flying height of the magnetic head from the magnetic disk are acquired.

Abstract: A method for testing performance of a magnetic head slider includes the steps of: (1) rotating the disk and positioning the slider over the rotating disk at an initial fly-height; (2) exciting the fly-height actuator to make the slider touch the disk and recording a touch down spacing of the read head of the slider; (3) backing off the slider at a predetermined backoff amount from the disk; (4) testing dynamic performance of the slider to obtain a reference value which is related to the spacing between the disk and the slider; (5) varying the initial fly-height of the slider; (6) repeating the steps (2) to (4) with the backoff amount fixed; and (7) calculating a dynamic fly-height gamma ratio based at least in part on the recorded touch down spacing and the obtained reference values.

Abstract: A method of measuring temperature of a TMR element includes a step of obtaining in advance a temperature coefficient of element resistance of a discrete TMR element that is not mounted on an apparatus, by measuring temperature versus element resistance value characteristic of the discrete TMR element in a state that a breakdown voltage is intentionally applied to the discrete TMR element and a tunnel barrier layer of the discrete TMR element is brought into a stable conductive state, a step of bringing a tunnel barrier layer of a TMR element actually mounted on the apparatus into a stable conductive state by intentionally applying the breakdown voltage to the mounted TMR element having the same structure as that of the discrete TMR element whose temperature coefficient has been measured, a step of measuring an element resistance value of the mounted TMR element with the tunnel barrier layer that has been brought into a stable conductive state, and a step of obtaining a temperature corresponding to the measure

Abstract: A method for testing performance of a magnetic head slider includes the steps of: (1) rotating the disk and positioning the slider over the rotating disk at an initial fly-height; (2) exciting the fly-height actuator to make the slider touch the disk and recording a touch down spacing of the read head of the slider; (3) backing off the slider at a predetermined backoff amount from the disk; (4) testing dynamic performance of the slider to obtain a reference value which is related to the spacing between the disk and the slider; (5) varying the initial fly-height of the slider; (6) repeating the steps (2) to (4) with the backoff amount fixed; and (7) calculating a dynamic fly-height gamma ratio based at least in part on the recorded touch down spacing and the obtained reference values.

Abstract: A method of measuring temperature of a TMR element includes a step of obtaining in advance a temperature coefficient of element resistance of a discrete TMR element that is not mounted on an apparatus, by measuring temperature versus element resistance value characteristic of the discrete TMR element in a state that a breakdown voltage is intentionally applied to the discrete TMR element and a tunnel barrier layer of the discrete TMR element is brought into a stable conductive state, a step of bringing a tunnel barrier layer of a TMR element actually mounted on the apparatus into a stable conductive state by intentionally applying the breakdown voltage to the mounted TMR element having the same structure as that of the discrete TMR element whose temperature coefficient has been measured, a step of measuring an element resistance value of the mounted TMR element with the tunnel barrier layer that has been brought into a stable conductive state, and a step of obtaining a temperature corresponding to the measure

Abstract: Acoustic attenuation materials are described that comprise outer layers of a stiff material sandwiching a relatively soft elastic material therebetween, with means such as spheres, discs or wire mesh being provided within the elastic material for generating local mechanical resonances that function to absorb sound energy at tunable wavelengths.

Abstract: A two-terminal memory device based on semiconductor (such as Si or Ge) or metal (such as Al or Au) nanocrystals and/or nanoparticles is described wherein each device has a substrate, a dielectric layer (such as SiO2 or organic dielectric materials) nanocrystals and/or nanoparticles distributed throughout the dielectric layer, and a metal (or poly-crystalline Si, or conductive organic materials) gate electrode. The memory states of the device are distinguished by charging and discharging the nanocrystals and/or nanoparticles. This two-terminal memory device is much simpler than the conventional four-terminal MOSFET-based memory device in terms of device structure and fabrication process. In addition, it is flexible if the memory devices are fabricated on flexible substrate with organic materials.

Abstract: Air ventilation cooling systems are described for operation in a portable power device. Each air ventilation system comprises a cord stand in a structure that allows efficient heat dissipation generated from a power module. In a first aspect of the invention, a portable power device with natural convection for heat transfer is disclosed. In a second aspect of the invention, portable power devices with forced convection for heat transfer are disclosed.

Abstract: Acoustic attenuation materials are described that comprise outer layers of a stiff material sandwiching a relatively soft elastic material therebetween, with means such as spheres, discs or wire mesh being provided within the elastic material for generating local mechanical resonances that function to absorb sound energy at tunable wavelengths.

Abstract: Acoustic attenuation materials are described that comprise outer layers of a stiff material sandwiching a relatively soft elastic material therebetween, with means such as spheres, discs or wire mesh being provided within the elastic material for generating local mechanical resonances that function to absorb sound energy at tunable wavelengths.