Distinguishing spin pumping from spin rectification in lateral spin pumping device architectures based on doped organic semiconductors

Change log
Zadvorna, O 
Venkateshvaran, Deepak  ORCID logo  https://orcid.org/0000-0002-7099-7323
Sirringhaus, Henning  ORCID logo  https://orcid.org/0000-0001-9827-6061

Over the last two decades organic spintronics has developed into a striving field with exciting reports of long spin diffusion lengths and spin relaxation times in organic semiconductors (OSCs). Easily processed and inexpensive, OSCs are considered a potential alternative to inorganic materials for use in spintronic applications. Spin currents have been detected in a wide range of materials, however, there is still uncertainty over the origin of the signals. Recently, we explored spin transport through an organic semiconductor with lateral spin injection and detection architectures, where the injected spin current is detected non-locally via spin-to-charge conversion in an inorganic detector. In this work we show that the widely-used control experiments like linear power dependence and inversion of the signal with the magnetic field are not sufficient evidence of spin transport and can lead to an incorrect interpretation of the signal. Here, we use in-plane angular dependent measurements to separate pure spin signal from parasitic effects arising from spin rectification (SREs). Apart from well established anisotropic magnetoresistance (AMR) and anomalous Hall effect (AHE), we observed a novel effect which we call spurious inverse spin Hall effect (ISHE). It strongly resembles ISHE behaviour, but arises in the ferromagnet rather than the detector meaning this additional effect has to be considered in future work.

cond-mat.mes-hall, cond-mat.mes-hall
Journal Title
Physical Review Materials
Conference Name
Journal ISSN
Volume Title
American Physical Society (APS)
Publisher's own licence
European Research Council (610115)
Royal Society (URF\R1\201590)