ONLINE - PhD Mid-term Seminar Series: Study of spin to charge conversion in high resistive BixSe1-x

Study of spin to charge conversion in high resistive BixSe1-x 

Isabel Cristina Arango

Nanodevices Group, CIC nanoGUNE

The spin Hall effect and its inverse are very important phenomena occurring in materials with large spin-orbit coupling, which allow to create and detect spin currents in spintronic devices without the use of ferromagnetic materials. The spin-to-charge current conversion efficiency is given by the spin Hall angle θSH [1]. Large θSH has been reported in topological insulators such as bismuth selenide (Bi2Se3) due to the spin-momentum locking occurring at the topologically protected surface states [2]. Recently, large conversion efficiencies have been reported in sputtered amorphous BixSe1-x [3][4]. Amorphous BixSe1-x is thus a promising material that can be used in the recently proposed magneto-electric spin-orbit (MESO) logic device by Intel [5], in which not only large θSH is needed, but also a large resistivity [6]. 

However, electrical spin injection in nanostructured devices have not been used in any of the previous works, which is required for a MESO device with integration with standard CMOS electronics. We were able to fabricate sputtered amorphous BixSe1-x nanostructures which display consistent semiconducting behavior with high resistivities. This result allows us to face the challenge of integrating sputtered amorphous BixSe1-x in lateral spin valve (LSV) devices in order to quantify spin-to-charge conversion in this material from an all-electrical technique.


[1] E. Sagasta et al., Physical Review B, 94 060412 (2016). 

[2] Y. Wang et. al., Physical Review Letters, 114 257202 (2015). 

[3] M. DC et al., Applied Physics Letters, 114 102401 (2019). 

[4] M. DC et al., Nature Materials, 17 800-807 (2018). 

[5] S. Manipatruni et al., Nature, 565 35-42 (2019). 

[6] V. T. Pham et al., Nature Electronics 3, 309 (2020).  


PhD Mid-term Seminar Series: Isabel Arango & José Manuel Pereira - CIC nanoGUNE

When: Oct 4, 2021 11:00 AM 

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Isabel Arango, Nanodevices Group

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