Patent ID: 6911270

Claim:
A master information carrier for magnetic transfer in which a magnetic field is applied in a circumferential direction comprising a base sheet which is formed of a magnetic material and is provided with protruding portions and recessed portions which constitute an irregularity pattern representing information to be transferred to an in-plane magnetic recording medium, and a magnetic layer formed on at least the upper surface of the protruding portions of the irregularity pattern and on the recessed portions of the irregularity pattern and the height h 1 of the protruding portion of the irregularity pattern and the height h 2 of the magnetic layer on the upper surface of the protruding portion of the irregularity pattern from the surface of magnetic layer on the recessed portion of the irregularity pattern satisfy the following formula 0.2 ≦h 2 / h 1 ≦0.8, wherein a saturation magnetization Ms of the base sheet and a saturation magnetization Mm of the magnetic layer satisfy the following condition, 1.0 <Mm/Ms <100.