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Article Dans Une Revue AIP Advances Année : 2024

Towards fully electrically controlled domain-wall logic

B B Vermeulen
E. Raymenants
V T Pham
S. Pizzini
B. Sorée
K. Wostyn
S. Couet
V D Nguyen
K. Temst

Résumé

Utilizing magnetic tunnel junctions (MTJs) for write/read and fast spin-orbit-torque (SOT)-driven domain-wall (DW) motion for propagation, enables non-volatile logic and majority operations, representing a breakthrough in the implementation of nanoscale DW logic devices. Recently, current-driven DW logic gates have been demonstrated via magnetic imaging, where the Dzyaloshinskii-Moriya interaction (DMI) induces chiral coupling between perpendicular magnetic anisotropy (PMA) regions via an in-plane (IP) oriented region. However, full electrical operation of nanoscale DW logic requires electrical write/read operations and a method to pattern PMA and IP regions compatible with the fabrication of PMA MTJs. Here, we study the use of a Hybrid Free Layer (HFL) concept to combine an MTJ stack with DW motion materials, and He+ ion irradiation to convert the stack from PMA to IP. First, we investigate the free layer thickness dependence of 100-nm diameter HFL-MTJ devices and find an optimal CoFeB thickness, from 7 to 10 Å, providing high tunneling magnetoresistance (TMR) readout and efficient spin-transfer torque (STT) writing. We then show that high DMI materials, like Pt/Co, can be integrated into an MTJ stack via interlayer exchange coupling with the CoFeB free layer. In this design, DMI values suitable for SOT-driven DW motion are measured by asymmetric bubble expansion. Finally, we demonstrate that He+ irradiation reliably converts the coupled free layers from PMA to IP. These findings offer a path toward the integration of fully electrically controlled DW logic circuits.
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Dates et versions

hal-04485431 , version 1 (01-03-2024)

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B B Vermeulen, E. Raymenants, V T Pham, S. Pizzini, B. Sorée, et al.. Towards fully electrically controlled domain-wall logic. AIP Advances, 2024, 14 (2), pp.025030. ⟨10.1063/9.0000811⟩. ⟨hal-04485431⟩

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