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US-9183870-B2 · Nov 10, 2015 · US
Magnetic recording medium having a soft magnetic underlayer with tailored relative permeability regions
US8980447B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8980447-B2 |
| Application number | US-201314365345-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 7, 2013 |
| Priority date | Jun 27, 2012 |
| Publication date | Mar 17, 2015 |
| Grant date | Mar 17, 2015 |
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Abstract
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A magnetic recording medium is disclosed. The magnetic recording medium includes at least a disc-shaped non-magnetic substrate having a hole at a center, a soft magnetic underlying layer, and a magnetic recording layer. Relative permeability of the soft magnetic underlying layer under a magnetic field having one of the frequencies 100 MHz to 700 MHz increases gradually from a disc outer circumference to a disc inner circumference and a characteristic frequency of the relative permeability increases gradually from the disc inner circumference to the disc outer circumference.
First claim
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The invention claimed is: 1. A magnetic recording medium, comprising: a disc-shaped non-magnetic substrate having a hole disposed at a center of the disc-shaped non-magnetic substrate; a soft magnetic underlying layer; and a magnetic recording layer; wherein relative permeability of the soft magnetic underlying layer under a magnetic field having a frequency of between about 100 MHz and about 700 MHz increases gradually from a disc outer circumference to a disc inner circumf…
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Frequently asked questions
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- What does patent US8980447B2 cover?
- A magnetic recording medium is disclosed. The magnetic recording medium includes at least a disc-shaped non-magnetic substrate having a hole at a center, a soft magnetic underlying layer, and a magnetic recording layer. Relative permeability of the soft magnetic underlying layer under a magnetic field having one of the frequencies 100 MHz to 700 MHz increases gradually from a disc outer circumf…
- Who is the assignee on this patent?
- Fuji Electric Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification G11B5/82. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 17 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).