Method for producing sintered ferrit magnet, and sintered ferrite magnet
US-2015332819-A1 · Nov 19, 2015 · US
Hexagonal ferrite magnetic particles, magnetic recording powder, and magnetic recording medium
US9818517B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9818517-B2 |
| Application number | US-201414224726-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 25, 2014 |
| Priority date | Mar 26, 2013 |
| Publication date | Nov 14, 2017 |
| Grant date | Nov 14, 2017 |
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Abstract
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Hexagonal ferrite magnetic particles have an activation volume ranging from 1,000 nm 3 to 1,500 nm 3 , and ΔE 10% /kT, thermal stability at 10% magnetization reversal, is equal to or greater than 40.
First claim
Opening claim text (preview).
What is claimed is: 1. Hexagonal ferrite magnetic particles, which have: an activation volume ranging from 1,000 nm 3 to 1,300 nm 3 , and ΔE 10% /kT, thermal stability at 10% magnetization reversal, is equal to or greater than 40; wherein the activation volume is an activation volume that is measured in an environment of 23° C.±1° C., and the hexagonal ferrite magnetic particles comprise 1.5 atomic percent to 20 atomic percent of Al relative to Fe. 2. The hexagonal ferrite magnetic particles according to claim 1 , which have a coercive force ranging from 175 kA/m to 400 kA/m. 3. The hexagonal ferrite magnetic particles according to claim 1 , which exhibit a switching field distribution, SFD, ranging from 0.2 to 0.8. 4. The hexagonal ferrite magnetic particles according to claim 2 , which exhibit a switching field distribution, SFD, ranging from 0.2 to 0.8. 5. Magnetic recording powder, which is comprised of the hexagonal ferrite magnetic particles according to claim 1 . 6. A magnetic recording medium comprising a magnetic layer comprising ferromagnetic material and binder on a nonmagnetic support, wherein the ferromagnetic material comprises the hexagonal ferrite magnetic particles according to claim 1 . 7. A magnetic recording medium comprising a magnetic layer comprising ferromagnetic material and binder on a nonmagnetic support, wherein the ferromagnetic material comprises the hexagonal ferrite magnetic particles according to claim 2 . 8. A magnetic recording medium comprising a magnetic layer comprising ferromagnetic material and binder on a nonmagnetic support, wherein the ferromagnetic material comprises the hexagonal ferrite magnetic particles according to claim 3 . 9. A magnetic recording medium comprising a magnetic layer comprising ferromagnetic material and binder on a nonmagnetic support, wherein the ferromagnetic material comprises the hexagonal ferrite magnetic particles according to claim 4 . 10. The hexagonal ferrite magnetic particles according to claim 1 , wherein the hexagonal ferrite magnetic particles are hexagonal barium ferrite magnetic particles.
Assignees
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Classifications
containing Fe metal or alloys (G11B5/70621 takes precedence) · CPC title
Ferrites · CPC title
- H01F1/11Primary
in the form of particles {(for magnetic record carriers G11B5/70626)} · CPC title
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- What does patent US9818517B2 cover?
- Hexagonal ferrite magnetic particles have an activation volume ranging from 1,000 nm 3 to 1,500 nm 3 , and ΔE 10% /kT, thermal stability at 10% magnetization reversal, is equal to or greater than 40.
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F1/11. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Nov 14 2017 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).