Particulate magnetic recording medium and magnetic recording device
US-8947984-B2 · Feb 3, 2015 · US
Magnetic recording medium for microwave assisted recording and magnetic recording device
US10115425B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10115425-B2 |
| Application number | US-201715498732-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 27, 2017 |
| Priority date | Apr 28, 2016 |
| Publication date | Oct 30, 2018 |
| Grant date | Oct 30, 2018 |
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Abstract
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Provided is a coating-type magnetic recording medium for microwave assisted recording. A magnetic recording medium for microwave assisted recording having a magnetic layer including ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer exhibits an intrinsic ferromagnetic resonance frequency of 30.0 GHz or more. A magnetic recording device including the magnetic recording medium and a magnetic head for microwave assisted recording.
First claim
Opening claim text (preview).
What is claimed is: 1. A magnetic recording medium for microwave assisted recording comprising: a magnetic layer including ferromagnetic powder and a binder on a non-magnetic support, wherein the magnetic layer is a single layer of a magnetic layer exhibiting two or more different intrinsic ferromagnetic resonance frequencies of 30.0 GHz or more, the magnetic layer comprises two or more different kinds of ferromagnetic powder, the different kinds of ferromagnetic powder have different coercive forces from each other, and the coercive forces are 210 kA/m or more. 2. The magnetic recording medium for microwave assisted recording according to claim 1 , wherein the two or more different kinds of ferromagnetic powder are metallic oxide powders. 3. The magnetic recording medium for microwave assisted recording according to claim 2 , wherein the metallic oxide powders are ferrite powders. 4. The magnetic recording medium for microwave assisted recording according to claim 1 , wherein the two or more different intrinsic ferromagnetic resonance frequencies exhibited by the magnetic layer are both in a range of 30.0 to 50.0 GHz. 5. A magnetic recording device comprising: a magnetic recording medium; and a magnetic head for microwave assisted recording, wherein the magnetic recording medium has a magnetic layer including ferromagnetic powder and a binder on a non-magnetic support, the magnetic layer is a single layer of a magnetic layer exhibiting two or more different intrinsic ferromagnetic resonance frequencies of 30.0 GHz or more, the magnetic layer comprises two or more different kinds of ferromagnetic powder, the different kinds of ferromagnetic powder have different coercive forces from each other, and the coercive forces are 210 kA/m or more, and the magnetic head for microwave assisted recording records two or more different types of information on the magnetic layer by means of microwave assisted recording including application of a microwave magnetic field of two or more different frequencies to the magnetic layer. 6. The magnetic recording device according to claim 5 , wherein the two or more different kinds of ferromagnetic powder are metallic oxide powders. 7. The magnetic recording device according to claim 6 , wherein the metallic oxide powders are ferrite powders. 8. The magnetic recording device according to claim 5 , wherein the two or more different intrinsic ferromagnetic resonance frequencies exhibited by the magnetic layer are both in a range of 30.0 to 50.0 GHz.
Assignees
Inventors
Classifications
Microwave assisted recording · CPC title
- G11B5/012Primary
Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) · CPC title
on a base layer · CPC title
Digital recording · CPC title
- G11B5/70626Primary
containing non-metallic substances · CPC title
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- What does patent US10115425B2 cover?
- Provided is a coating-type magnetic recording medium for microwave assisted recording. A magnetic recording medium for microwave assisted recording having a magnetic layer including ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer exhibits an intrinsic ferromagnetic resonance frequency of 30.0 GHz or more. A magnetic recording device including the magneti…
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/012. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 30 2018 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).