Method for inspecting magnetic recording media, and method for manufacturing magnetic recording media.

Abstract

To provide a highly reliable method for inspecting magnetic recording media and a method for manufacturing magnetic recording media. [Solution] A method for inspecting a magnetic recording medium 42 having a magnetic layer on a non-magnetic substrate, wherein the inspection apparatus 41 identifies a defect portion having a non-periodic convex shape based on an output signal obtained by scanning the surface of the magnetic recording medium with an inspection head 50 having a thermosensitive resistance element using an inspection head drive mechanism 60. The convex shape has a height of 0.1 nm to 1.5 nm and a width of 1 μm to 15 μm.

Claims

1. A method for inspecting a magnetic recording medium having a magnetic layer on a non-magnetic substrate, Based on the output signal obtained by scanning the surface of the magnetic recording medium with an inspection head having a thermoresistive element, a non-periodic convex-shaped defect is identified. A method for inspecting a magnetic recording medium, characterized in that the convex shape has a height of 0.1 nm or more and 1.5 nm or less, and a width of 1 μm or more and 15 μm or less.

2. The method for inspecting a magnetic recording medium according to claim 1, wherein the convex shape is formed in the manufacturing process of the magnetic recording medium.

3. A method for inspecting a magnetic recording medium according to claim 1 or 2, wherein a non-periodic defect portion having a convex shape is identified based on the output signal from which signals caused by undulations on the surface of the magnetic recording medium have been removed.

4. The method for inspecting a magnetic recording medium according to claim 1 or 2, wherein the thermal resistance element is a magnetoresistive element.

5. A method for manufacturing a magnetic recording medium having a magnetic layer on a non-magnetic substrate, The method for manufacturing the magnetic recording medium is as follows: A magnetic recording medium forming step involves heating the non-magnetic substrate to form a magnetic layer, An inspection step in which the magnetic recording medium obtained by the magnetic recording medium forming step is inspected by the magnetic recording medium inspection method described in claim 1 or 2, A method for manufacturing a magnetic recording medium, characterized by including the following:

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