Fujitsu Corporation

Maki Maeda

Takuya Uzumaki

Hiroto Takeshita

Atsushi Tanaka

Kiyoshi Nishikawa

A magnetic recording layer is formed on an auxiliary magnetic layer in a perpendicular magnetic recording medium. The auxiliary magnetic layer has the axis of easy magnetization in the vertical direction perpendicular to the surface of a substrate. The perpendicular magnetic recording medium reliably allows establishment of the magnetization in the auxiliary magnetic layer in the vertical direction. When a magnetic flux flows along the vertical direction perpendicular to the surface of the magnetic recording layer, the magnetic flux flows across the magnetic recording layer in the vertical direction. The magnetization is thus reliably established in the magnetic recording layer in the vertical direction. The magnetic field of a stronger intensity is thus leaked out of the magnetic recording layer in the vertical direction.

Perpendicular magnetic recording medium

A thin film magnetic head has a magnetic pole major layer terminated at a position receding from a medium-opposed surface. An intermediate magnetic layer extends forward toward the medium-opposed surface from the surface of the magnetic pole major layer. The intermediate magnetic layer is terminated at a position receding from the medium-opposed surface. A tip magnetic layer extends to the medium-opposed surface from the surface of the intermediate magnetic layer so as to expose the front end at the medium-opposed surface. The layered structure serves to diminish variation in the sectional area of the path of the magnetic flux. Saturation of magnetic flux is sufficiently suppressed irrespective of the reduction in the sectional area. Even if the tip magnetic layer is reduced in lateral width, the tip magnetic layer allows a sufficient leakage of magnetic flux from the front end.

Single pole magnetic head having intermediate magnetic layer and tip magnetic layer

The present invention provides a perpendicular magnetic recording medium that reduces medium noise and achieves thermal stability of recording magnetization. This perpendicular magnetic recording medium has a substrate and a recording layer formed by single-layered magnetic nanoparticles that are aligned at uniform intervals. An auxiliary magnetic film that is thinner than the recording layer is interposed between the substrate and the recording layer. The magnetization of the magnetic nanoparticles is secured by the exchange interaction effect of the auxiliary magnetic film.

A magnetic recording medium is provided. The magnetic recording medium comprises an in-plane magnetic film used for recording, and a perpendicular magnetic film formed on the in-plane magnetic film. The in-plane magnetic film has a magnetization easy axis in an in-plane direction. The perpendicular magnetic film has a magnetization easy axis oriented in a direction perpendicular to the magnetization easy axis of the in-plane magnetic film. A tBr (a product of a thickness and a residual magnetization) of the perpendicular magnetic film is set so as not to exceed one-fifth of a tBr of the in-plane magnetic film at the maximum.

Growing community of inventors

Kawasaki, Japan

Maki Maeda