Magnetic recording medium, manufacturing method of particles of epsilon type iron oxide-based compound, and manufacturing method of magnetic recording medium
US-2019304496-A1 · Oct 3, 2019 · US
Magnetic recording medium
US2018358044A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2018358044-A1 |
| Application number | US-201815996678-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jun 4, 2018 |
| Priority date | Jun 9, 2017 |
| Publication date | Dec 13, 2018 |
| Grant date | — |
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Abstract
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Provided is a magnetic recording medium including: a non-magnetic support; and a magnetic layer including particles of at least one kind of epsilon type iron oxide-based compound selected from the group consisting of ε-Fe 2 O 3 and a compound represented by Formula (1), and a binding agent, at least on one surface of the non-magnetic support, in which an average area Sdc of a magnetic cluster in a DC demagnetization state measured with a magnetic force microscope satisfies a relationship of 500 nm 2 <Sdc<3,000 nm 2 , and coercivity Hc satisfies a relationship of 319 kA/m<Hc<957 kA/m. In Formula (1), A represents at least one kind of metal element other than Fe and a satisfies a relationship of 0<a<2. ε−A a Fe 2-a O 3 (1)
First claim
Opening claim text (preview).
What is claimed is: 1 . A magnetic recording medium comprising: a non-magnetic support; and a magnetic layer including particles of at least one kind of epsilon type iron oxide-based compound selected from the group consisting of ε-Fe 2 O 3 and a compound represented by Formula (1), and a binding agent, at least on one surface of the non-magnetic support, wherein an average area Sdc of a magnetic cluster in a DC demagnetization state measured with a magnetic force microscope satisfies a relationship of 500 nm 2 <Sdc<3,000 nm 2 , and coercivity Hc satisfies a relationship of 319 kA/m<Hc<957 kA/m, ε-A a Fe 2-a O 3 (1) in Formula (1), A represents at least one kind of metal element other than Fe and a satisfies a relationship of 0<a<2. 2 . The magnetic recording medium according to claim 1 , wherein an average equivalent circle diameter of the particles of the epsilon type iron oxide-based compound is 7 nm to 18 nm. 3 . The magnetic recording medium according to claim 1 , wherein the epsilon type iron oxide-based compound includes the compound represented by Formula (1), and A in Formula (1) is at least one kind of metal element selected from the group consisting of Ga, Al, In, Ti, Co, Zn, and Nb. 4 . The magnetic recording medium according to claim 1 , wherein the average area Sdc of a magnetic cluster in a DC demagnetization state measured with a magnetic force microscope satisfies a relationship of 500 nm 2 <Sdc<1,500 nm 2 . 5 . The magnetic recording medium according to claim 4 , wherein the average area Sdc of a magnetic cluster in a DC demagnetization state measured with a magnetic force microscope satisfies a relationship of 550 nm 2 ≤Sdc≤700 nm 2 . 6 . The magnetic recording medium according to claim 1 , wherein a recording system is a linear recording system. 7 . The magnetic recording medium according to claim 1 , which is used in electromagnetic wave assist recording.
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Classifications
containing Co metal or alloys · CPC title
- G11B5/70642Primary
iron oxides · CPC title
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- What does patent US2018358044A1 cover?
- Provided is a magnetic recording medium including: a non-magnetic support; and a magnetic layer including particles of at least one kind of epsilon type iron oxide-based compound selected from the group consisting of ε-Fe 2 O 3 and a compound represented by Formula (1), and a binding agent, at least on one surface of the non-magnetic support, in which an average area Sdc of a magnetic cluster …
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/70642. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Dec 13 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). 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).