Hitachi, Ltd.

Hitachi Global Storage Technologies Japan, Ltd.

Ryuji Tsuchiyama

Mikio Tokuyama

Hiromitsu Tokisue

Masaaki Matsumoto

Mieko Ishii

Youichi Kawakubo

Junguo Xu

Kiyoshi Hashimoto

Hidekazu Kohira

Hiroshi Tani

Yoshihiko Miyake

Takuya Matsumoto

Masayuki Kurita

Kyo Akagi

Irizo Naniwa

Yuko Tsuchiya

Mitsuhiro Shoda

Hiroshi Ikekame

Masaki Odai

Kyosuke Ono

Xu Junguo

Masahumi Mochizuki

Provided is a magnetic head slider apparatus that can minimize a change in a roll angle caused by an impact force even with a submount mounted on a side surface thereof and achieve steady flying with the roll angle minimized. A dimple position and a pressure center position of a lifting force are moved in a slider width direction to thereby align a center of mass of a slider having a submount including a laser diode mounted on a side surface thereof, the dimple position, and the pressure center position of the lifting force with each other. This provides a magnetic head slider and a suspension thereof, and a magnetic disk drive apparatus offering higher recording density and higher reliability.

Magnetic head slider apparatus, magnetic disk drive apparatus, and suspension thereof

In a discrete track medium and a patterned medium, a meniscus adsorptive force is reduced and writing into adjacent tracks is prevented. A magnetic layer in lands or patterns in the discrete track medium or the patterned medium is formed into a cylindrical shelly or spherical shelly shape with a uniform thickness. Moreover, a height of cylindrical shelly land or a height of spherical shelly land is changed between 5 nm and 30 nm according to radial positions. Thus, an effect is achieved for providing a magnetic recording medium and a magnetic disk apparatus which are excellent in realizing higher recording density and higher reliability.

Magnetic recording medium having lands with curved upper surfaces and magnetic recording and reproducing apparatus

A magnetic head slider including: a head element which records or reproduces information on a magnetic disk, a slider having said head element, and an electric conducting film in which paired first and second parts are formed to be substantially parallel, where current flows within said first and second parts are in the opposite direction as against said slider.

Magnetic head heating element in a disk drive

A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first surface and a second surface provided at an air-outflow side at positions with respect to the first surface, and projections having a cylindrical shape are provided on a third surface at an air-inflow side at positions with respect to said first surface.

Magnetic head slider and a magnetic disk device in which the slider is mounted

A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side, projections being provided at the air-inflow side at positions with respect to the first positive pressure generating portion on a first surface which faces the magnetic disk upon read/write operation of the magnetic head slider, and a step surface provided at the air-inflow side with respect to said first positive pressure generating portion.

A magnetic head slider in which a leading pad is projected in a thicknesswise direction of the slider, in comparison with a trailing pad so as to reduce vibration caused by contact between a flat medium surface of a disc and the slider carrying thereon a magnetic head, to reduce variation in flying height caused by wavy unevenness of the medium surface, and to reduce variation in atmospheric pressure around the slider, thereby it is possible to enhance the recording density and the reliability of the magnetic head slider while reducing the costs thereof. Further, a magnetic disc unit using the above-mentioned magnetic head slider.

Magnetic head slider and magnetic disc unit

A magnetic head slider mounted on a magnetic disk unit for supporting a magnetic head that writes and reads information to and from a magnetic disk is constructed such that a depth &#x3b4;sfrom the surfaces of leading and trailing pads, which come into contact with a medium surface when the disk is at rest, to stepped surfaces formed on the air inflow side of the leading pads, a depth &#x3b4;sfrom the contact surfaces to stepped surfaces formed on the air inflow side of the trailing pad and a step depth &#x3b4;sfrom the contact surfaces to the surfaces of side rails are in a relation of &#x3b4;s&#x2266;&#x3b4;s&#x3b4;sWith this arrangement, the slider can follow the waved medium surface at a low flying height with a small flying height fluctuation, thus realizing high density recording, high reliability and reduced cost of the magnetic disk unit.

Magnetic head slider, support therefor and magnetic disk unit

A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side. Projections are provided at the air-inflow side respect to the first positive pressure generating portion on a surface which faces the magnetic disk upon read/write operation of the magnetic head slider.

An object of the present invention is to prevent a spacing between a magnetic head and a writing medium at low temperature from increasing to cause a writing/reading error, and to prevent the magnetic head element protruded by a temperature increase from colliding with small protrusions on a magnetic disk surface, and to prevent damage on the element, and to prevent the occurrence of thermal asperity. In order to attain the object, a magnetic head slider is provided, which includes a magnetic head element supported on a rotating magnetic disk via a gap to write or read information on the magnetic disk, and a heat source for heating the magnetic head element. A magnetic disk device is further provided, which includes a magnetic head slider.

A magnetic disk apparatus includes a low-rotation mode for decreasing the revolution number of a disk, in the low-rotation mode, any control signal for decelerating the disk is not generated to permit it to be decelerated owing to inertial drive and when a detected speed falls below a target speed, the disk is accelerated to thereby realize power saving.

Magnetic disk apparatus

A magnetic disc apparatus includes a magnetic disc, a slider incorporating lifting rails or lifting pads, a magnetic head provided to a lifting rail or a lifting pad on the outflow end side, a suspension supporting the slider, and a carriage attached to the suspension. The slider has an inverted stepped wall formed in a shape such that it is caved in a direction from the inflow end to the outflow end of the slider, and a bleed surface formed at the outflow end side of the inverted stepped wall and caved from the lifting rails or the lifting pads. An action point of an equivalent load is located offset from the inverted stepped wall of the slider toward the inflow end of the slider.

Magnetic disc apparatus with slider having specified location of action point of equivalent load

A head element is made into contact with the surface of a recording medium so as to realize a float-up degree of 5 nm. Accordingly, a slider incorporating the head element for recording and reproducing data to and from the recording medium is provided thereon with a plurality of pads having step parts, and one of the plurality of pads, on which the head element is mounted, has a height which is less than that of the other pads. Thus, the pads other than the pad on which the head element is mounted are floated up while the pad on which the head element is mounted is stably made into contact with the surface of the recoding medium by means of a meniscus suction force and a damping action of lubricant applied on the surface of the recording medium.

Slider capable of reducing distance between head element and recording medium, and recording apparatus incorporating same

A magnetic head slider assembly is provided, in which a flying height of the head slider is not changed when a peripheral speed and a yaw angle of the magnetic head slider assembly with respect to a magnetic disk are changed according to the change of a magnetic head slider radial position, so that a difference between flying heights in floating profiles become minimum. The magnetic head slider is provided with two stepped surfaces via a difference portion with respect to a contact surface of an inflow pad or an outflow pad of the magnetic head slider ( ), wherein a ratio &dgr;s/&dgr;r between a depth &dgr;s of the first stepped surface and a depth &dgr;r of the second stepped surface with respect to the contact surface and a ratio xp/L between a length L of the slider in an air stream inflow direction and a distance xp between an air stream inflow end and a dimple position of the slider are respectively set in a range 0.047&lE;&dgr;s/&dgr;r&lE;0.364 and 0.002&lE;xp/L&lE;0.4, or a range 0.008&lE;&dgr;s/&dgr;r&lE;0.025 and 0.55&lE;xp/L.

Magnetic head slider

A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first surface provided at an air-inflow side and a second surface provided at an air-outflow side. Projections are provided at the air-inflow side with respect to the first surface on a surface while faces the magnetic disk upon read/write operation of the magnetic head slider.

A decrease in the lift-up degree of the outflow end of a slider at an altitude of 3,000 m is set to be less than 2 nm or to be zero in order to set the lift-up degree of the outflow end to be less than 10 nm. There is provided a magnetic disc apparatus in which the action point of positive pressure is shifted toward the inflow end but the action point of negative pressure is shifted toward the outflow end so as to enhance the influence upon the outflow end by the negative pressure in order to effect an action in the increasing direction of the lift-up degree of the outflow end when the pressure is reduced. Further, it is possible to increase the lift-up degree of the outflow end when the pressure is decreased. The action point of the equivalent load is offset from the action point of positive pressure toward the inflow end, and the distance between the action point of the positive pressure and the action point of the equivalent load point is set to be greater than 0.1 times as large as the overall slider length.

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Matsudo, Japan

Ryuji Tsuchiyama