Study of spin-orbit interactions and interlayer ferromagnetic coupling in Co/Pt/Co trilayers in a wide range of heavy-metal thickness
Ogrodnik, Piotr (AGH University of Science and Technology. Institut of Electronics)
Grochot, Krzysztof (AGH University of Science and Technology. Institut of Electronics)
Karwacki, Łukasz (Utrecht University. Institute for Theoretical Physics)
Kanak, Jarosław (AGH University of Science and Technology. Institut of Electronics)
Prokop, Michał (Institut Català de Nanociència i Nanotecnologia)
Chȩciński, Jakub (AGH University of Science and Technology. Institut of Electronics)
Skowroński, Witold (AGH University of Science and Technology. Institut of Electronics)
Ziȩtek, Sławomir (AGH University of Science and Technology. Institut of Electronics)
Stobiecki, Tomasz (AGH University of Science and Technology. Institut of Electronics)

Data:	2021
Resum:	The spin-orbit torque, a torque induced by a charge current flowing through the heavy-metal-conducting layer with strong spin-orbit interactions, provides an efficient way to control the magnetization direction in heavy-metal/ferromagnet nanostructures, required for applications in the emergent magnetic technologies like random access memories, high-frequency nano-oscillators, or bioinspired neuromorphic computations. We study the interface properties, magnetization dynamics, magnetostatic features, and spin-orbit interactions within the multilayer system Ti(2)/Co(1)/Pt(0-4)/Co(1)/MgO(2)/Ti(2) (thicknesses in nanometers) patterned by optical lithography on micrometer-sized bars. In the investigated devices, Pt is used as a source of the spin current and as a nonmagnetic spacer with variable thickness, which enables the magnitude of the interlayer ferromagnetic exchange coupling to be effectively tuned. We also find the Pt thickness-dependent changes in magnetic anisotropies, magnetoresistances, effective Hall angles, and, eventually, spin-orbit torque fields at interfaces. The experimental findings are supported by the relevant interface structure-related simulations, micromagnetic, macrospin, as well as the spin drift-diffusion models. Finally, the contribution of the spin-orbital Edelstein-Rashba interfacial fields is also briefly discussed in the analysis.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Ferromagnetic resonance ; Spin Hall effect ; Magnetoresistance ; Spin−orbit torques ; Rashba−Edelstein effect
Publicat a:	ACS applied materials & interfaces, Vol. 13, issue 39 (Oct. 2021) , p. 47019-47032, ISSN 1944-8252

DOI: 10.1021/acsami.1c11675
PMID: 34558910

14 p, 4.7 MB

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