Ferromagnetic/nonmagnetic nanostructures for the electrical measurement of the Spin Hall effect and the detection of domain walls

Abstract : The bulk effect of the interconversion between charge current and spin current is activated by spin Hall effect (SHE) and its inverse. It is vastly recognized that the SHE originate of the strong spin–orbit coupling in nonmagnetic materials. This thesis is focused on a proposal techniques to characterize SHE and inverse spin Hall effect (ISHE) in the ferromagnetic/nonmagnetic (F/N) nanostructure and electrical detection of magnetic domain walls by using SHE and ISHE. We will briefly give the cornerstones and the basic spintronic concepts, in order to ease the understanding of the work presented in this thesis, and the state-of-the-art of the SHE investigations. In the second part, a technique of F/N nanostructure are proposed and applied to detect the spin Hall angle and spin diffusion length of Pt. Then the technique will be used to characterize the SHE/ISHE in different materials, heavy metal and alloys. The influence of the interfaces in the device will also investigated. In the last of this manuscript, we demonstrate a domain wall (DW) detection method, based on the ability for a ferromagnetic nanowire, in which a DW is pinned, to inject or detect a PSC what can be produced/detected by SHE/ISHE.
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Submitted on : Friday, December 15, 2017 - 5:16:08 PM
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Van Tuong Pham. Ferromagnetic/nonmagnetic nanostructures for the electrical measurement of the Spin Hall effect and the detection of domain walls. Materials Science [cond-mat.mtrl-sci]. Université Grenoble Alpes, 2017. English. ⟨NNT : 2017GREAY026⟩. ⟨tel-01665346⟩

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