PhD thesis defense: spin-to-charge current interconversion in highly resistive sputtered bismuth selenide

CIC nanoGUNE Seminars

Speaker
Isabel C. Arango
Pre-Doctoral Researcher at CIC nanoGUNE
When
2023/11/27
11:30
Place
Sala de actos, Facultad de Química (UPV/EHU), Paseo Manuel Lardizabal, 3, 20018 Donostia, Gipuzkoa
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PhD thesis defense: spin-to-charge current interconversion in highly resistive sputtered bismuth selenide

The development of spin-orbitonic devices, such as the magneto-electric spin-orbit (MESO) logic devices proposed by Intel, requires materials with high resistivity and high spin-to-charge interconversion efficiency. One of the most promising candidates in this regard is sputtered BixSe1-x. Although there are several techniques to quantify spin-to-charge interconversion, the reported values for sputtered BixSe1-x have often been overestimated due to spurious effects related to local currents combined with a lack of understanding of the effect of interfaces and the use of approximations for unknown parameters such as the spin diffusion length. In this thesis we systematically study the spin transport properties of the polycrystalline sputtered BixSe1-x by different spin-to-charge interconversion techniques.  The results of this thesis highlight the importance of considering all the details of BixSe1-x  and its interfaces in order to properly quantify the spin transport properties of this material, something that is unfortunately neglected in many studies. Although the existing literature has reported a high SCI efficiency for BixSe1-x and presented this material as a promising candidate for MESO logic devices, our work shows otherwise.