SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Focus Session: Spin-Charge Interconversion (joint session MA/HL)

MA 6.2: Hauptvortrag

Dienstag, 28. September 2021, 14:00–14:30, H5

Spin-to-charge current conversion for logic devices — •Felix Casanova — CIC nanoGUNE, San Sebastian, Basque Country, Spain

The integration of logic and memory in spin-based devices, such as the recent MESO proposal by Intel [1], could represent a post-CMOS paradigm. A key player is the spin Hall effect (SHE), which allows to electrically create or detect pure spin currents without using ferromagnets (FM). Understanding the different mechanisms giving rise to SHE allows to optimize spin-to-charge conversion (SCC) in heavy metals. With this knowledge, we developed a novel and simple FM/Pt nanodevice to readout the in-plane magnetic state of the FM electrode using SHE [2]. The spin-orbit based detection allows us to independently enhance the output voltage (needed to read the in-plane magnetization) and the output current (needed for cascading circuit elements) with downscaling of different device dimensions, which are necessary conditions for implementing the MESO logic [1].

Finally, I will present a radically different approach to further enhance SCC. By engineering a van der Waals heterostructure which combines graphene with a transition metal dichalcogenide, we first demonstrated SHE in graphene due to spin-orbit proximity [3]. The combination of long-distance spin transport and SHE in the same material gives rise to an unprecedented SCC efficiency, making graphene-based systems excellent candidates for MESO logic [1,2].

[1] Manipatruni et al., Nature 565, 35 (2019); [2] Pham et al., Nature Electron. 3, 309 (2020); [3] Safeer et al., Nano Lett. 19, 1074 (2019); Herling et al., APL Mater. 8, 071103 (2020).