Invention Grant
- Patent Title: High-speed, low power spin-orbit torque (SOT) assisted spin-transfer torque magnetic random access memory (STT-MRAM) bit cell array
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Application No.: US15247791Application Date: 2016-08-25
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Publication No.: US10381060B2Publication Date: 2019-08-13
- Inventor: Jimmy Jianan Kan , Chando Park , Peiyuan Wang , Sungryul Kim , Seung Hyuk Kang
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Qualcomm Incorporated/Seyfarth Shaw LLP
- Main IPC: G11C11/16
- IPC: G11C11/16 ; H01L27/22

Abstract:
A magnetic random access memory (MRAM) array including several bit cells is described. Each of the bit cells may include a perpendicular magnetic tunnel junction (pMTJ) including a reference layer, a barrier layer supporting the reference layer, and a free layer supporting the barrier layer. A spin-hall conductive material layer may support the free layer. A driver may be operable to set a state of at least one of the bit cells using an increased spin-transfer torque (STT) current and a spin-hall effect from the spin-hall conductive material layer. The increased STT current may be driven through the spin-hall conductive material layer and the pMTJ so that a spin current is generated from the reference layer and the spin-hall conductive material layer.
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