Magnetic recording medium
AssigneeTDK Corporation
InventorsHitoshi Hirayama, Masao Nakayama
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Abstract
A magnetic recording medium comprises a non-magnetic substrate and a metal thin film magnetic layer formed by an oblique evaporating method on the substrate, the non-magnetic substrate being an aromatic polyamide film. The film has a thickness of 3.0 μm to 6.0 μm, has a Young's modulus in the transverse direction of 16000 MPa to 18000 MPa, and has a thermal contraction coefficient (in the transverse direction; 180° C. for 30 minutes) of 0.7% to 1.3%. With this structure, it has been found that the thermal deformation (cupping) after the thin film is formed can be prevented to improve head touch and the electromagnetic conversion properties.
Claims2
A magnetic recording medium comprising:
- a non-magnetic substrate;
- and
- a metal thin film magnetic layer formed on the substrate by an oblique evaporating method,
- wherein the non-magnetic substrate is an aromatic polyamide film, and
- wherein the film has a Young's modulus in the transverse direction of 16000 MPa to 18000, and has a thermal contraction coefficient of 0.7% to 1.3%.
Dependencies are inferred from the claim text.