Investigating voltage-control of magnon spin transport in room-temperature multiferroic Sr₃Co₂Fe₂₄O₄₁ using nonlocal device-geometry

Spintronic devices based on pure magnon spin currents are envisaged as next-generation efficient devices due to absence of Joule heating. Besides, voltage control of the magnon transport has recently attracted great attention from the spintronics community [1]. In this regard, room-temperature magnetoelectric multiferroic Sr₃Co₂Fe₂₄O₄₁ (SCFO) is a promising material for studying voltage-controlled nonlocal magnon transport. Notably, our earlier spin transport studies on bulk SCFO showed that spin pumping and spin current absorption by the SCFO|Pt interface can be tuned by manipulating the conical magnetic structure of SCFO [2].

Here, we have deposited SCFO thin films on substrates, Al₂O₃ (111), SrTiO₃ (STO) (001) and Nb-doped STO (001) using the pulsed LASER deposition technique. These films are characterised by performing XRD, magnetoelectric, and spin Hall magnetoresistance measurements. Further, we have examined the effect of applied electric field on nonlocal magnon transport in bilayers, Al₂O₃|SCFO|Pt (Nb-STO|SCFO|Pt) by applying voltage on two (three)-terminal devices. Our studies elucidate the role of the electric field in tuning magnon spin transport via manipulation of the conical spin structure.

[1] Parsonnet et al. PRL 129, 087601 (2022)

[2] Wagh et al. arXiv:2205.11539