Spin transport and spin-to-charge current conversion in polyaniline by means of spin Seebeck experiments

• Published in: Journal of magnetism and magnetic materials 2022-02, Vol.543, p.168635, Article 168635
• Main Authors: Mendes, J.B.S., Guedes, R.C.O., Cunha, R.O.
• Format: Article
• Language: English
• Subjects: Conductors; Hall effect; Organic semiconductors; Polyaniline; Polyanilines; Seebeck effect; Spin Seebeck effect; Spintronics; Yttrium; Yttrium-iron garnet
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2021.168635

•Hybrid magnetic nanostructures based on organic semiconductors.•Transport of spin current across a layer of the polyaniline organic semiconductor.•Experimental detection of the spin-to-charge current interconversion in organic semiconductors by spin Seebeck effect.•Use of polyaniline as a spin current conductor and detector. We report an investigation of the transport of a pure spin current across a thin layer of organic conductor polyaniline (PANI) sandwiched between a film of the ferrimagnetic insulator yttrium iron garnet (YIG) and a thin layer of platinum. The spin current, generated by spin Seebeck effect of the YIG film, is injected through the YIG/PANI interface, crosses the whole PANI layer and is injected into the Pt layer, where it is converted into a charge current by means of the inverse spin Hall effect and electrically detected as a DC voltage. We also present revealing results of experimental detection of the spin-to-charge current interconversion measured directly on the PANI layer in which we were able obtain the spin Hall angle θSH=(1.70±0.06)×10-5 showing that this organic conductor presents a great potential in spintronics devices.