Invention Grant
- Patent Title: Magnetoresistive memory device and method of operating same using ferroelectric-controlled exchange coupling
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Application No.: US17656310Application Date: 2022-03-24
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Publication No.: US12211535B2Publication Date: 2025-01-28
- Inventor: Alan Kalitsov , Derek Stewart , Ananth Kaushik , Gerardo Bertero
- Applicant: SANDISK TECHNOLOGIES LLC
- Applicant Address: US TX Addison
- Assignee: SANDISK TECHNOLOGIES LLC
- Current Assignee: SANDISK TECHNOLOGIES LLC
- Current Assignee Address: US TX Addison
- Agency: THE MARBURY LAW GROUP PLLC
- Main IPC: G11C11/16
- IPC: G11C11/16 ; G01R33/09 ; H01F10/32 ; H10B61/00 ; H10N50/10 ; H10N50/80 ; H10N50/85

Abstract:
A magnetoresistive memory cell includes a magnetoresistive layer stack containing a reference layer, a nonmagnetic spacer layer, and a free layer. A ferroelectric material layer having two stable ferroelectric states is coupled to a strain-modulated ferromagnetic layer to alter a sign of magnetic exchange coupling between the strain-modulated ferromagnetic layer and the free layer. The strain-modulated ferromagnetic layer may be the reference layer or a perpendicular magnetic anisotropy layer that is located proximate to the ferroelectric material layer. The magnetoresistive memory cell may be configured as a three-terminal device or as a two-terminal device, and may be configured as a tunneling magnetoresistance (TMR) device or as a giant magnetoresistance (GMR) device.
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