Patents
US 12749505 B1: Magneto-optical Kerr effect reader for hard disk drives
- Granted
- 2026-09-29
- Filed
- 2025-06-03 application 19226771
- Type
- Utility · 20 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
Described are disk drives that utilize the magneto-optic Kerr effect (MOKE) in near field to read data that has been recorded on magnetic media. When polarized light is reflected from the surface of magnetic media at a perpendicularly magnetized bit, polar MOKE results in rotation of the polarization of the light. A reader configured to analyze the polarization orientation of light reflected from recorded bits can be used to discern the states of the bits. Near-field transducers such as used in some heat-assisted magnetic recording disk drives may be used to emit polarized light that is incident on the surface of the recording medium.
Source: PTBLXML, file of 2026-09-29 (ipgb20260929.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| Seagate Technology LLC 4,936 patents | US company or organization | Fremont, CA | PTBLXML, file of 2026-09-29 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Alexey Dobrynin | Londonderry, GB | 7 | PTBLXML, file of 2026-09-29 | |
| Andres David Barbosa Neira | Londonderry, GB | PTBLXML, file of 2026-09-29 | ||
| Yury Khaydukov | Londonderry, GB | PTBLXML, file of 2026-09-29 | ||
| Beverley Rutherford McConnell | Londonderry, GB | PTBLXML, file of 2026-09-29 | ||
| Kevin Anthony McNeill | Londonderry, GB | PTBLXML, file of 2026-09-29 | ||
| Mark Anthony Gubbins | Letterkenny, IE | 72 | PTBLXML, file of 2026-09-29 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| G11B | Information storage based on relative movement between record carrier and transducer | G11B7/005 | PTBLXML, file of 2026-09-29 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2026-08-04 | Assignment Assignment of assignor's interest | DOBRYNIN, ALEXEY signed 2025-05-29 NEIRA, ANDRES DAVID BARBOSA signed 2025-06-02 KHAYDUKOV, YURY signed 2025-06-02 MCCONNELL, BEVERLEY RUTHERFORD signed 2025-06-02 MCNEILL, KEVIN ANTHONY signed 2025-05-29 GUBBINS, MARK ANTHONY signed 2025-06-02 | SEAGATE TECHNOLOGY LLC FREMONT, CA | 75523/255 | PASDL, file of 2026-10-07 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.