Impact of the interface quality of Pt/YIG(111) hybrids on their spin Hall magnetoresistance

Abstract

We study the influence of the interface quality of Pt/Y${}_3$Fe${}_5$O${}_{12}$(111) hybrids on their spin Hall magnetoresistance. This is achieved by exposing Y${}_3$Fe${}_5$O${}_{12}$(111) single crystal substrates to different well-defined surface treatments prior to the Pt deposition. The quality of the Y${}_3$Fe${}_5$O${}_{12}$(YIG) surface, the Pt/YIG interface and the Pt layer is monitored \textit{in-situ} by reflection high-energy electron diffraction and Auger electron spectroscopy as well as \textit{ex-situ} by atomic force microscopy and x-ray diffraction. To identify the impact of the different surface treatments on the spin Hall magnetoresistance, angle-dependent magnetoresistance measurements are carried out at room temperature. The largest spin Hall magnetoresistance is found in Pt/YIG fabricated by a two-step surface treatment consisting of a "piranha" etch process followed by an annealing step at $500^{\circ }$C in pure oxygen atmosphere. Our data suggest that the small SMR in Pt/YIG without any surface treatments of the YIG substrate prior to Pt deposition is caused by a considerable carbon agglomeration at the Y${}_3$Fe${}_5$O${}_{12}$ surface.

References in corpus (3)

• Theory of spin Hall magnetoresistance
• Scaling behavior of the spin pumping effect in ferromagnet/platinum bilayers
• Advances in single crystal growth and annealing treatment of electron-doped HTSC

Cited by in corpus (12)

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• Orbital Pumping in Ferrimagnetic Insulators
• Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y${}_3$Fe${}_5$O${}_{12}$ and inverted Y${}_3$Fe${}_5$O${}_{12}$/Pt bilayers
• Enhancement of YIG$|$Pt spin conductance by local Joule annealing
• Focused ion beam modification of non-local magnon-based transport in yttrium iron garnet/platinum heterostructures
• Spin Hall magnetoresistance effect from a disordered interface
• Spin Hall magnetoresistance at the altermagnetic insulator/Pt interface
• Statistical characterization of the spin Hall magnetoresistance in YIG/Pt heterostructures
• Effect of interface quality on spin Hall magnetoresistance in Pt/MgFe${}_2$O${}_4$ bilayers
• Disambiguating electrical detection of magnetization dynamics in magnetic insulators