Efficient spin transport through polyaniline

J. B. S. Mendes, O. Alves Santos, J. P. Gomes, H. S. Assis, J. F. Felix, R. L. Rodríguez-Suárez, S. M. Rezende, and A. Azevedo
Phys. Rev. B 95, 014413 – Published 12 January 2017

Abstract

By using the spin pumping process, we show that it is possible to transport a pure spin current across layers of conducting polyaniline (PANI) with several hundred nanometers sandwiched between a film of the ferrimagnetic insulator yttrium iron garnet (YIG) and a thin layer of platinum. The spin current generated by microwave-driven ferromagnetic resonance of the YIG film, injected through the YIG/PANI interface, crosses the whole PANI layer and then is injected into the Pt layer. By means of the inverse spin Hall effect in the Pt, the spin current is converted into charge current and electrically detected as a dc voltage. We measured a spin diffusion length in PANI of 590 ± 40 nm, which is very large compared with normal metals, demonstrating that PANI can be used as an efficient spin current conductor and poor charge current conductor, opening the path towards spintronics applications based in this very attractive material.

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  • Received 4 September 2016
  • Revised 18 December 2016

DOI:https://doi.org/10.1103/PhysRevB.95.014413

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. B. S. Mendes1, O. Alves Santos2, J. P. Gomes1, H. S. Assis1, J. F. Felix1,3, R. L. Rodríguez-Suárez2,4, S. M. Rezende2, and A. Azevedo2,*

  • 1Departamento de Física, Universidade Federal de Viçosa, 36570-900, Viçosa, MG, Brazil
  • 2Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife, Pernambuco, Brazil
  • 3Instituto de Física, Universidade de Brasília, Núcleo de Física Aplicada, 70910-900, Brasília, DF, Brazil
  • 4Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago, Chile

  • *Corresponding author: aac@df.ufpe.br

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Issue

Vol. 95, Iss. 1 — 1 January 2017

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