Mitsubishi Chemical Corporation

Ryuichi Yoshiyama

Yuzo Seo

Yoji Arita

Toshihiko Kuriyama

Mitsunori Mochida

Junichi Kozu

Takashi Yamauchi

Akira Ohno

Shinji Aramaki

Yoshimasa Sakai

A field effect transistor including a gate insulation portion, an organic semiconductor portion, a source electrode and a drain electrode, wherein when a voltage is applied to the gate at 70&#xb0; C. for 5.0&#xb1;0.1 hours so that the field strength in the gate insulation portion would be 100&#xb1;5 MV/m, the change in the threshold voltage is within 5 V. The organic semiconductor portion has a high driving stability, of which the change in characteristics by driving is thereby small.

Field effect transistor

The disclosure describes a magnetic recording medium having at least a magnetic layer, optionally by means of an under layer, on a non-magnetic substrate, wherein projections formed by irradiation of an energy beam and each having a height from 1 to 60 nm are provided at the number of 10,to 10,per 1 mm,on the surface of any one of the non-magnetic substrate, the under layer, the magnetic layer and the magnetic recording medium.

Magnetic recording medium, method of producing the same, and recording and reading-out method

The present invention relates to a method of inspecting a magnetic disc, comprising:

Method of inspecting magnetic disc and apparatus therefor and process

A texturing apparatus for applying a texturing to a magnetic recording medium, such as a magnetic disk including a hard drive. A substrate such as a magnetic disk is held by a substrate rotating system, which is capable of rotating the substrate. A movable laser beam source including an electro-optic modulation circuit directs a laser beam through a focusing element onto the surface of the substrate. The modulation circuit allows the laser beam to pulse at a frequency from 0.1 to 100 MHz. The focusing element allows a laser beam spot diameter of 0.2 to 4 .mu.m on the surface of the substrate. This texturing includes texturing the magnetic head contact start and stop (CSS) area of hard disks.

Texturing apparatus for magnetic recording medium and magnetic recording

The disclosure describes a magnetic recording medium having at least a magnetic layer, optionally by means of an under layer, on a non-magnetic substrate, wherein projections formed by irradiation of an energy beam and each having a height from 1 to 60 nm are provided at the number of 10.sup.2 to 10.sup.8 per 1 mm.sup.2 on the surface of any one of the non-magnetic substrate, the under layer, the magnetic layer and the magnetic recording medium.

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Yokohama, Japan

Ryuichi Yoshiyama