| Autor: |
Grochot, Krzysztof, Ogrodnik, Piotr, Mojsiejuk, Jakub, Mazalski, Piotr, Skowroński, Witold, Stobiecki, Tomasz |
| Rok vydání: |
2022 |
| Předmět: |
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| DOI: |
10.48550/arxiv.2210.07357 |
| Popis: |
Spin-orbit torque current-induced magnetization switching provides an energy-efficient way of manipulating the magnetization in the ferromagnetic layers. Here, we present a detailed study of multilevel magnetization switching via spin-orbit torque in the Co/Pt/Co heterostructure with varied Pt thickness. Hence, the Pt layer plays the role of a spacer, providing the ability to control interlayer exchange coupling. As a result of the asymmetry between the top Pt/Co and bottom Co/Pt interfaces, and the coupling between the Co layers, four separate resistance states emerge when the external magnetic field is applied in the direction of the charge current. We reproduce the multilevel current switching mechanism using a numerical macro-spin model using the Landau-Lifshitz-Gilbert-Slonczewski equation. Finally, we propose an explanation of the accompanying multi-domain behavior, supported by measurements from polar-magnetooptical Kerr microscopy. Based on our findings, multilevel switching may have a potential application in energy-efficient high-density memory cells. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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