Fujitsu Corporation

Showa Denko K.k.

Tohru Horie

Akira Kikuchi

Shinya Sato

Iwao Okamoto

Kenji Sato

Yuki Yoshida

Isatake Kaitsu

Seigo Igaki

Hideyuki Akimoto

Masaya Suzuki

Takahisa Ueno

Ryo Kurita

Satoshi Igarashi

Akiko Honda

Naoya Saito

A magnetic recording medium includes a nonmagnetic granular layer that has a granular structure in which a plurality of nonmagnetic grains made of a nonmagnetic material are separated from one another by a Cr oxide. The magnetic recording medium further includes a magnetic granular layer that is formed on the nonmagnetic granular layer and has a granular structure in which a plurality of magnetic grains made of a magnetic material are separated from one another by a nonmagnetic material.

Magnetic recording medium and information storage apparatus

After a measurement apparatus records a magnetization state of a reference pattern on at least one specific track of a recording medium, it generates a leakage magnetic field of a demagnetization pattern and demagnetizes the magnetization state of the reference pattern using the leakage magnetic field. Then, the measurement apparatus calculates a difference between the read output of a reference pattern before demagnetization and the read output of a reference pattern after demagnetization on the specific track and obtains a leakage magnetic field of a recording head from the obtained difference.

Apparatus and method of measuring write magnetic field of recording head

A magnetic recording medium for high areal recording density that has excellent thermal fluctuation resistance and recording/reproduction characteristics, and a method of producing the same. The magnetic recording medium includes a glass substrate, an NiP layer having an oxide film on its surface provided on the glass substrate, a ground layer provided on the NiP layer, and a nonmagnetic intermediate layer provided on the ground layer. The magnetic recording medium further includes an exchange layer structure composed of a ferromagnetic layer and a nonmagnetic coupling layer provided on the nonmagnetic intermediate layer, and a magnetic recording layer provided on the exchange layer structure. The oxide film on the NiP layer is formed by introducing a small quantity of oxygen into a vacuum chamber of a sputter device. The formation and oxidation of the NiP layer are conducted at a temperature of not less than 140&deg; C.

Magnetic recording medium with an exchange layer structure including a CoCrPtB ferromagnetic layer

Growing community of inventors

Higashine, Japan

Tohru Horie