Magnetic recording medium and magnetic recording device
AssigneeFujitsu Limited
InventorsRyosaku Inamura, Isatake Kaitsu, Takuya Uzumaki
Life of this patent
Estimating the term…
Abstract
A magnetic recording medium includes; a base member; an underlayer formed on the base member; a main recording layer formed on the underlayer, and a writing assist layer formed on or under the main recording layer in contact with the main recording layer. The main recording layer has perpendicular magnetic anisotropy with an anisotropic magnetic field of Hk1 and an inclination of a reversal part of a magnetization curve of a1. The writing assist layer has an anisotropic magnetic field of Hk2 and an inclination of a reversal part of a magnetization curve of a2. The anisotropic magnetic fields Hk1 and Hk2 and the inclinations a1 and a2 satisfy Hk1>Hk2 ∞0 and a1>a2.
Claims20
A magnetic recording medium, comprising:
- a base member;
- an underlayer formed on the base member;
- a main recording layer formed on the underlayer, the main recording layer having perpendicular magnetic anisotropy with an anisotropic magnetic field of Hk1 and an inclination of a reversal part of a magnetization curve of a1;
- and
- a writing assist layer formed on or under the main recording layer in contact with the main recording layer, the writing assist layer having an anisotropic magnetic field of Hk2 and an inclination of a reversal part of a magnetization curve of a2,
- wherein the anisotropic magnetic fields Hk1 and Hk2 and the inclinations a1 and a2 satisfy Hk1>Hk2 and a1>a2.
A magnetic recording device, comprising:
- a magnetic recording medium which includes:
- a base member;
- an underlayer formed on the base member;
- a main recording layer formed on the underlayer, the main recording layer having perpendicular magnetic anisotropy with an anisotropic magnetic field of Hk1 and an inclination of a reversal part of a magnetization curve of a1;
- and
- a writing assist layer formed on or under the main recording layer in contact with the main recording layer, the writing assist layer having an anisotropic magnetic field of Hk2 and an inclination of a reversal part of a magnetization curve of a2;
- and
- a magnetic head opposing to the magnetic recording medium, wherein
- the anisotropic magnetic fields Hk1 and Hk2 and the inclinations a1 and a2 satisfy Hk1>Hk2 and a1>a2.
Dependencies are inferred from the claim text.