On-line SPICE-SPIN+X Seminars
On-line Seminar: 21.07.2021 - 15:00 German Time
Electrical manipulation of non-collinear antiferromagnet
Shunsuke Fukami, Tohoku University
Electrical manipulation of magnetic materials has been of paramount interest in the spintronics research for the last quarter of a century, and many interesting phenomena have been revealed, offering various opportunities of applications. Non-collinear antiferromagnet with chiral-spin structure is an attractive system showing intriguing properties that had been believed to be inherent to ferromagnets, such as the anomalous Hall effect . A recent study demonstrated an electrical switching of chiral-spin structure in the same protocol with magnetization switching in ferromagnets .
In this seminar, I will show a new phenomenon unique to the non-collinear antiferromagnet, i.e., chiral-spin rotation . We use Hall-bar devices with an epitaxial stack consisting of non-collinear antiferromagnetic Mn3Sn and heavy metals with large spin-orbit coupling [4,5]. An unconventional response of the Hall resistance under current applications is observed, which can be attributed to the continuous rotation of chiral-spin structure in Mn3Sn driven by the spin-orbit torque. We also find that the efficiency to manipulate the magnetic structure through this scheme is much higher than that in collinear ferromagnets and ferrimagnets.
 H. Tsai et al., Nature 580, 608 (2020).
 Y. Takeuchi et al., Nature Materials, advanced online publication (2021). https://doi.org/10.1038/s41563-021-01005-3.
 J.-Y. Yoon et al., Appl. Phys. Express, 13, 013001 (2019); J.-Y. Yoon et al. AIP Adv. 11, 065318 (2021).