Patents
US 12700422 B2: Write current undershoot for a heat-assisted magnetic storage device
- Granted
- 2026-08-04
- Filed
- 2024-09-30 application 18902185
- Type
- Utility · 20 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
An apparatus includes a write head. A preamplifier is coupled to the write head. A controller is coupled to the preamplifier and configured to cause the preamplifier to apply an overshoot current to the write head for a predefined overshoot current duration, apply an undershoot current to the write head for a predefined undershoot current duration, and apply a steady-state current to the write head after the undershoot current duration, the steady-state current being greater than the undershoot current.
Source: PTBLXML, file of 2026-08-04 (ipgb20260804.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 2026-08-04 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Yanzhang Liu | Eden Prairie, MN | 6 | PTBLXML, file of 2026-08-04 | |
| Zhen Wei | Maple Grove, MN | 16 | PTBLXML, file of 2026-08-04 | |
| Jianhua Xue | Maple Grove, MN | 51 | PTBLXML, file of 2026-08-04 | |
| Olle Gunnar Heinonen | Eden Prairie, MN | 30 | PTBLXML, file of 2026-08-04 | |
| Michael Allen Seigler | Eden Prairie, MN | 126 | PTBLXML, file of 2026-08-04 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| G11B | Information storage based on relative movement between record carrier and transducer | G11B5/09 | PTBLXML, file of 2026-08-04 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2024-09-30 | Assignment Assignment of assignor's interest | LIU, YANZHANG signed 2024-09-17 WEI, ZHEN signed 2024-09-18 XUE, JIANHUA signed 2024-09-17 HEINONEN, OLLE GUNNAR signed 2024-09-17 SEIGLER, MICHAEL ALLEN signed 2024-09-17 | SEAGATE TECHNOLOGY LLC FREMONT, CA | 68744/55 | PASDL, file of 2026-10-15 |
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.