Magnetization switching and deterministic nucleation in Co/Ni multilayered disks induced by spin–orbit torques
| Autor: | S. M. Chérif, Nicolas Reyren, D. H. Mosca, Yves Roussigné, Henri Jaffrès, Stéphane Collin, J. Zarpellon, Mohamed Belmeguenai, Laurent Vila, Sachin Krishnia, J.-M. George, N. Figueiredo-Prestes |
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| Přispěvatelé: | Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES), Centre National de la Recherche Scientifique (CNRS)-THALES |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Field (physics) Condensed matter physics Nucleation 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetization Ferromagnetism Hall effect [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] 0103 physical sciences Harmonic 010306 general physics 0210 nano-technology Spin (physics) ComputingMilieux_MISCELLANEOUS Phase diagram |
| Zdroj: | Applied Physics Letters Applied Physics Letters, American Institute of Physics, 2021, 119 (3), pp.032410. ⟨10.1063/5.0050641⟩ |
| ISSN: | 0003-6951 |
| DOI: | 10.1063/5.0050641⟩ |
| Popis: | We present experimental and numerical results on the magnetization reversal induced by spin–orbit torques of micronic disks of a ferromagnetic multilayer with perpendicular magnetic anisotropy on top of a Pt track: Pt (6 nm)/[Co(0.2 nm)/Ni(0.6 nm)] × 5/Al(5 nm). The current induced magnetization switching process is probed by anomalous Hall effect measurements and Kerr microscopy. The electrical characterization reveals the critical current for the complete reversal to be about 3×1011 A/m2, and Kerr microscopy uncovers a deterministic nucleation that depends on current and field polarity. Through the use of experimental switching phase diagrams coupled to micromagnetic simulations, we evaluated the field-like to damping-like torque ratio to be 0.73 ± 0.05, which is in good agreement with experimental values observed by second harmonic measurements. These measurements emphasize an unexpectedly large field-like contribution in this relatively thick Co/Ni multilayer (4 nm). In light of these experiments and simulations, we discuss the key parameters needed to understand the magnetization reversal, namely, the field and damping-like torques and the Dzyaloshinskii–Moriya interaction. |
| Databáze: | OpenAIRE |
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