Patents
US 12749503 B1: Waveguide multilayer core structure for use in heat assisted magnetic recording
- Granted
- 2026-09-29
- Filed
- 2025-05-07 application 19201077
- Type
- Utility · 19 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
Described are recording heads for heat assisted magnetic recording that include a light delivery waveguide that delivers light for excitation of a near-field transducer, where the waveguide has a multilayer core. The multilayer core includes a top outer layer nearest to the near-field transducer that has a lower refractive index than an inner layer of multilayer core. The described waveguides having a multilayer core can improve NFT coupling efficiency, which in turn can allow the use of lower optical power density, and thus provide better reliability for recording head components such as the near-field transducer.
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 |
|---|---|---|---|---|
| Chubing Peng | Eden Prairie, MN | 94 | 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 | G11B5/4866 | 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 | PENG, CHUBING signed 2025-05-05 | SEAGATE TECHNOLOGY LLC FREMONT, CA | 75518/249 | 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.