Fujitsu Corporation

Eiichi Kanda

Yoshifumi Mizoshita

Hitoshi Kanai

Takao Koshikawa

Yuji Uehara

Yoshinori Ohtsuka

Junichi Kane

Ken-ichi Aoshima

A magnetic head slider of the present invention includes a slider body having an air bearing surface opposed to a magnetic disk, a magnetic head including a magneto-resistance effect element provided on the slider body, first and second terminals connected to the MR element, and a switching element for short-circuiting the first and second terminals in response to an external input. With this configuration, it is possible to prevent the occurrence of damages of the MR element due to static electricity or the like. A photo-transistor is suitable as the switching element in consideration of productivity of a magnetic disk drive unit. In this case, the external input is light incident on the photo-transistor, and when the magnetic head slider is housed in a disk enclosure and is thereby shielded from light, the photo-transistor is turned off to allow a sensing current to flow in the MR element.

Magnetic head slider and magnetic head assembly with short-circuiting switching element

A head assembly includes a suspension, a head slider having a magnetoresistive element mounted on a tip end of the suspension, and a pair of lead lines disposed on the suspension and having ends connected to the magnetoresistive element. The head assembly also has an easily breakable short circuit pattern disposed on the suspension and connecting said lead lines to each other. When the head assembly is handled by itself, because the lead lines are short-circuited by the short circuit pattern, a current produced due to an electrostatic charge buildup flows through the short circuit pattern and is prevented from flowing through the magnetoresistive element. After the head assembly is installed on an actuator arm, the short circuit pattern is broken, electrically disconnecting the lead lines from each other.

Head assembly having short circuit pattern short-circuiting a pair of

Recording signals can be reproduced without needing a deviation of a recording magnetic pole and a magneto-resistive element in a track width direction and without causing an off-track in a whole region from the inner side to the outer side. A sense current supplying circuit which supplies a predetermined sense current to the magneto-resistive element and can switch the direction of the sense current is provided. By control means such as an MPU or the like, the direction of the sense current by the sense current supplying circuit is switched in accordance with a cylinder position of a combination head, thereby magnetically changing the center position of a reproducing sensitivity of the magneto-resistive element in a track width direction. The combination head has a structure such that a geometrical center position of the magneto-resistive element in a read head and a geometrical center position of a recording magnetic pole in a write head are made to coincide in the track direction.

Magnetic disk apparatus and method that reverses sense current in

A magnetoresistive head comprises a magnetoresistive layer having an axis of easy magnetization in the direction parallel to an air bearing surface, a first electrode formed on the magnetoresistive layer on the air bearing surface side and an oblique side portion with respect to the air bearing surface, and a second electrode formed to be separated at a distance from the first electrode and having a side portion substantially parallel to the oblique side portion of the first electrode on the magnetoresistive layer.

Growing community of inventors

Kawasaki, Japan

Eiichi Kanda