IP Library Granted Patent US 8,264,233
Granted Patent B2
US 8,264,233 · App. 12/511,780 · Granted Sep 11, 2012

Magnetoresistive electrostatic discharge (ESD) detector

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Quick Facts
Patent No.
US 8,264,233
App. No.
12/511,780
Granted
Sep 11, 2012
Kind
B2
Abstract

A magnetoresistive electrostatic discharge (ESD) event detector includes at least one magnetoresistive device. The at least one magnetoresistive device detects an ESD event in an ESD sensitive device based on magnetoresistive properties of the at least one magnetoresistive device. The magnetoresistive device has an ESD failure level that is lower than the ESD failure level of said ESD sensitive device.

Claims (21)

1. A magnetoresistive electrostatic discharge (ESD) event detector comprising:

at least one magnetoresistive device, wherein said at least one magnetoresistive device detects an ESD event in an ESD sensitive device based on magnetoresistive properties of said at least one magnetoresistive device, and wherein said at least one magnetoresistive device comprises an ESD sensitivity level that is greater than an ESD sensitivity level of said ESD sensitive device, wherein said ESD sensitivity level of said at least one magnetoresistive device is adjustable based at least in part on a group consisting of: a cross-sectional area of said at least one magnetoresistive device and a thickness of said at least one magnetoresistive device.

2. The detector of claim 1 , wherein said at least one magnetoresistive device comprises:

at least a portion of a giant magnetoresistive (GMR) transducer.

3. The detector of claim 1 , wherein said at least one magnetoresistive device comprises:

at least portion of a current-perpendicular-to-the-plane giant magnetoresistive (CPP GMR) transducer.

4. The detector of claim 1 , wherein said at least one magnetoresistive device comprises:

at least a portion of a tunneling magnetoresistive (TMR) transducer.

5. The detector of claim 1 , wherein said magnetoresistive properties of said at least one magnetoresistive device comprises:

a magnetic property, wherein said magnetic property comprises a pinned layer reversal in response to an ESD event that is greater than said ESD sensitivity level of said at least one said magnetoresistive device.

6. The detector of claim 1 , wherein said magnetoresistive properties of said at least one magnetoresistive device comprises:

a resistance, wherein said resistance of said at least one magnetoresistive device increases in response to an ESD event that is greater than said ESD sensitivity level of said at least one said magnetoresistive device.

7. The detector of claim 1 , wherein said magnetoresistive properties of said at least one magnetoresistive device comprises:

a resistance, wherein said resistance of said at least one magnetoresistive device decreases in response to an ESD event that is greater than said ESD sensitivity level of said at least one said magnetoresistive device.

8. The detector of claim 1 , further comprising:

said at least one magnetoresistive device electrically coupled to said ESD sensitive device, wherein said ESD sensitive device is potentially subject to said ESD event.

9. The detector of claim 8 , wherein said at least one magnetoresistive device is a plurality of magnetoresistive devices electrically coupled in series to said ESD sensitive device, wherein each of said plurality of magnetoresistive devices comprises a different ESD sensitivity level.

10. The detector of claim 1 , wherein said ESD event detector is disposed between said ESD sensitive device and said ESD event.

11. The detector of claim 1 , wherein said ESD event detector comprising a size, wherein said size is smaller than a size of said ESD sensitive device.

12. A magnetoresistive electrostatic discharge (ESD) event detector comprising:

at least one magnetoresistive device, wherein said at least one magnetoresistive device detects an ESD event in an ESD sensitive device based on magnetoresistive properties of said at least one magnetoresistive device, wherein said at least one magnetoresistive device comprises an ESD sensitivity level that is greater than an ESD sensitivity level of said ESD sensitive device, said at least one magnetoresistive device electrically coupled to said ESD sensitive device, wherein said ESD sensitive device is potentially subject to said ESD event and wherein said at least one magnetoresistive device is a plurality of magnetoresistive devices electrically coupled in parallel to said ESD sensitive device, wherein each of said plurality of magnetoresistive devices comprises a different ESD sensitivity level.

Assignments (7)
PATENT COLLATERAL AGREEMENT - A&R LOAN AGREEMENT Recorded Aug 21, 2023
From: WESTERN DIGITAL TECHNOLOGIES, INC.
To: JPMORGAN CHASE BANK, N.A.
Reel/Frame 064715/0001 →
PATENT COLLATERAL AGREEMENT - DDTL LOAN AGREEMENT Recorded Aug 21, 2023
From: WESTERN DIGITAL TECHNOLOGIES, INC.
To: JPMORGAN CHASE BANK, N.A.
Reel/Frame 067045/0156 →
RELEASE OF SECURITY INTEREST AT REEL 052915 FRAME 0566 Recorded Feb 8, 2022
From: JPMORGAN CHASE BANK, N.A.
To: WESTERN DIGITAL TECHNOLOGIES, INC.
Reel/Frame 059127/0001 →
SECURITY INTEREST Recorded Feb 6, 2020
From: WESTERN DIGITAL TECHNOLOGIES, INC.
To: JPMORGAN CHASE BANK, N.A., AS AGENT
Reel/Frame 052915/0566 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 6, 2016
From: HGST NETHERLANDS B.V.
To: WESTERN DIGITAL TECHNOLOGIES, INC.
Reel/Frame 040826/0821 →
CHANGE OF NAME Recorded Oct 25, 2012
From: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.
To: HGST NETHERLANDS B.V.
Reel/Frame 029341/0777 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 29, 2009
From: WALLASH, ALBERT
To: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.
Reel/Frame 023023/0790 →