Recording medium, method of making, and information processing apparatus
AssigneeTDK Corporation
InventorsYoshihiko Yano, Katsuto Nagano
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Abstract
In conjunction with a recording medium for recording and reading information by utilizing the construction of AFM or STM and the polarization reversal of a ferroelectric material as well as an information processing apparatus having the recording medium, an object of the invention is to tailor the medium noiseless and sufficiently reliable to withstand repetitive data rewriting. The recording medium has a ferroelectric layer having unidirectionally oriented crystal axes on a substrate, and the ferroelectric layer has a ten point mean roughness Rz of up to 2 nm across a reference length of 500 nm over at least 80% of its surface. A protective layer or a lubricating layer may be disposed on the surface of the ferroelectric layer.
Claims29
A ferroelectric recording medium for recording information by utilizing the polarization reversal of a ferroelectric material, comprising a ferroelectric layer having unidirectionally oriented crystal axes on a substrate, said ferroelectric layer having a ten point mean roughness Rz of up to 2 nm across a reference length of 500 nm over at least 80% of its surface, and said ferroelectric layer is of a perovskite material, a tungsten bronze material, or an oxide material containing a rare earth element (inclusive of scandium and yttrium), manganese and oxygen and having a hexagonal YMnO.sub.3 crystalline structure.
Dependencies are inferred from the claim text.