Abstract
The Weyl antiferromagnet Mn3Sn has recently attracted significant attention as it is not only a novel magnetic quantum material of fundamental interest, but it also opens opportunities to investigate a number of exotic spin-dependent transports for practical antiferromagnetic devices. Here, we report the large spin to charge conversion observed in YIG/Mn3Sn. Evidenced by both spin Seebeck and spin pumping measurements, the spin to charge conversion efficiency of Mn3Sn is found ∼2.5 times of that for the conventional heavy metal Ta. Our results suggest a promising potential for employing a topological non-trivial antiferromagnet to achieve more efficient spin to charge conversion than conventional metallic materials.
Highlights
The crystallinity of the yttrium iron garnet (YIG)/Mn3Sn(10)/Ir(2) film was first examined by x-ray diffraction (XRD)
No clear peak can be identified for the thin Mn3Sn layer due to the strong background from the YIG layer and the GGG substrate in the XRD pattern, it is revealed later by the scanning transmission electron microscopy (STEM) characterization, as shown in Fig. 2(a), in which the sputtered Mn3Sn is only partially crystallized into nano-sized granules when the thickness of the Mn3Sn layer is thinned to 10 nm
Since the detected spin Seebeck signal is always proportional to Jc, say, VSSE ∝ θSSHSEJs × σ, the detected spin Seebeck voltage VSSE switches its sign correspondingly when the magnetization of the YIG is reversed by the applied external magnetic field
Summary
The crystallinity of the YIG/Mn3Sn(10)/Ir(2) film was first examined by x-ray diffraction (XRD). Noticing that the spin current generated in the YIG is proportional to the ∇T as well as to the heating power Pheating, it is convenient to characterize the efficiency of ISHE by introducing the effective spin Hall angle and the spin Seebeck current is represented as[43]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
