Micromagnetic simulations for deterministic switching in SOT-MRAM cell with additional heavy metal capping strip
Journal
Applied Physics Letters
Journal Volume
122
Journal Issue
14
Date Issued
2023-04-03
Author(s)
Kuan-hao Chiao
Abstract
Spin-orbit torque magnetic random-access memory (SOT-MRAM) has received extensive interest in the memory industry. Recent works have focused on a heavy metal (HM)/ferromagnet bilayer with an additional HM capping strip to deterministically switch the magnetization. This paper investigates the switching behaviors of SOT-MRAM utilizing this structure with micromagnetic simulations coupled to the drift-diffusion spin transport model. The mechanism is attributed to the non-negligible negative z-component from spin accumulation on the bottom HM interface, which originates from the associated accumulation at the edges of the HM capping strip. Moreover, device parameters are shown as crucial for deterministic switching and lower power consumption. This study provides fundamental insights into deterministic switching for SOT-MRAM with an additional HM capping strip, which can be readily adopted into practical applications.
Subjects
SPIN-ORBIT TORQUE; SKYRMION MOTION; MAGNETIZATION; FIELD; FERROMAGNET; ANISOTROPY; DIFFUSION; DYNAMICS; ENERGY
SDGs
Publisher
AIP Publishing
Type
journal article