Method for producing sintered ferrit magnet, and sintered ferrite magnet
US-2015332819-A1 · Nov 19, 2015 · US
Hexagonal ferrite magnetic powder for magnetic recording, method for producing hexagonal ferrite magnetic particles, and magnetic recording medium
US9748026B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9748026-B2 |
| Application number | US-201514757517-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 23, 2015 |
| Priority date | Jun 28, 2013 |
| Publication date | Aug 29, 2017 |
| Grant date | Aug 29, 2017 |
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Abstract
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Provided are hexagonal ferrite magnetic powder for magnetic recording, being comprised of hexagonal ferrite magnetic particles having a crystalline metal oxide adhered to a surface thereof, a method for producing hexagonal ferrite magnetic particles having a crystalline metal oxide adhered to a surface thereof, and a magnetic recording medium.
First claim
Opening claim text (preview).
What is claimed is: 1. Hexagonal ferrite magnetic powder for magnetic recording, which is comprised of hexagonal ferrite magnetic particles having a crystalline metal oxide adhered to a surface thereof, wherein the activation volume is in a range of 800 nm 3 to 1600 nm 3 , and the crystalline metal oxide is a crystalline oxide of a metal selected from the group consisting of Al, Zr, and Ce. 2. The hexagonal ferrite magnetic powder for magnetic recording according to claim 1 , wherein the hexagonal ferrite magnetic particles are hexagonal ferrite magnetic particles having a crystalline metal oxide adhered to the surface thereof in which the amount of the metal falls within a range of 0.5 atom % to 20 atom % with respect to 100 atom % of Fe. 3. The hexagonal ferrite magnetic powder for magnetic recording according to claim 1 , wherein the hexagonal ferrite magnetic particles are barium ferrite magnetic particles. 4. The hexagonal ferrite magnetic powder for magnetic recording according to claim 1 , wherein the hexagonal ferrite magnetic particles are strontium ferrite magnetic particles. 5. A magnetic recording medium having a magnetic layer including ferromagnetic powder and a binder on a non-magnetic support body, wherein the ferromagnetic powder is hexagonal ferrite magnetic powder for magnetic recording, which is comprised of hexagonal ferrite magnetic particles having a crystalline metal oxide adhered to a surface thereof, the hexagonal ferrite magnetic powder for magnetic recording has an activation volume in a range of 800 nm 3 to 1600 nm 3 , and the crystalline metal oxide is a crystalline oxide of a metal selected from the group consisting of Al, Zr, and Ce. 6. The magnetic recording medium according to claim 5 , wherein the hexagonal ferrite magnetic particles are hexagonal ferrite magnetic particles having a crystalline metal oxide adhered to the surface thereof in which the amount of the metal falls within a range of 0.5 atom % to 20 atom % with respect to 100 atom % of Fe. 7. The magnetic recording medium according to claim 5 , wherein the hexagonal ferrite magnetic particles are barium ferrite magnetic particles. 8. The magnetic recording medium according to claim 5 , wherein the hexagonal ferrite magnetic particles are strontium ferrite magnetic particles.
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Classifications
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 US9748026B2 cover?
- Provided are hexagonal ferrite magnetic powder for magnetic recording, being comprised of hexagonal ferrite magnetic particles having a crystalline metal oxide adhered to a surface thereof, a method for producing hexagonal ferrite magnetic particles having a crystalline metal oxide adhered to a surface thereof, and a magnetic recording medium.
- 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 Aug 29 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).