Perpendicular magnetic recording medium and magnetic recording apparatus
AssigneesKabushiki Kaisha Toshiba, Showa Denko K.K.
InventorsTakashi Hikosaka, Takeshi Iwasaki, Futoshi Nakamura, Soichi Oikawa, Hiroshi Sakai, Kenji Shimizu, Akira Sakawaki
Life of this patent
Estimating the term…
Abstract
A double layered perpendicular recording media having, between a soft magnetic layer and perpendicular magnetic recording layer, an alignment control layer containing an amorphous portion, a crystal size control layer, and an underlayer having one of a hexagonal closest packed structure and a face-centered cubic structure.
Claims16
A perpendicular magnetic recording medium comprising a substrate, a soft magnetic layer formed on the substrate, an alignment control layer containing an amorphous portion formed on the soft magnetic layer, a crystal size control layer formed on the alignment control layer, an underlayer which is formed on the crystal size control layer and has one of a hexagonal closest packed structure and a face-centered cubic structure, and a perpendicular magnetic recording layer.
A magnetic recording/reading apparatus comprising:
- a perpendicular magnetic recording medium comprising a substrate, a soft magnetic layer formed on the substrate, an alignment control layer containing an amorphous portion formed on the soft magnetic layer, a crystal size control layer formed on the alignment control layer, an underlayer which is formed on the crystal size control layer and has one of a hexagonal closest packed structure and a face-centered cubic structure, and a perpendicular magnetic recording layer;
- and
- a single pole type recording head which records information on the perpendicular magnetic recording medium.
Dependencies are inferred from the claim text.