[20p-C501-1~14] 10.4 Spintronics in semiconductor, topological material, superconductor, and multiferroics

2:15 PM - 2:30 PM JST(5:15 AM - 5:30 AM UTC)English Presentation

[20p-C501-4] Influence of the Ru composition change on the spin-to-charge conversion in SrRu_1-xO₃ films

〇(D)Shingo Kaneta¹, Yuki K. Wakabayashi², Yoshitaka Taniyasu², Hideki Yamamoto², Yoshiharu Krockenberger², Hikari Shinya^1,3, Masaaki Tanaka^1,3, Shinobu Ohya^1,3 (1.The Univ. of Tokyo, 2.NTT-BRL, 3.CSRN, The Univ. of Tokyo)

Keywords:

Perovskite oxide,SrRuO3,Spin-to-charge conversion

The perovskite SrRuO₃ has attracted attention in spintronics due to the observation of the Weyl fermions. Previous studies have clarified that Ru stoichiometry is crucial in realizing the Weyl states; deviations in the stoichiometric ratio of Ru significantly alter the magnetic and transport properties. Therefore, the amount of Ru deficiency is also thought to affect the spin-charge conversion in SrRuO₃ significantly; however, this has never been investigated. Here, we report the influence of the Ru stoichiometry change on the spin-to-charge conversion in all-epitaxial (La,Sr)MnO₃ (LSMO)/SrRu_1-xO₃ (x=0 or 0.3) by spin pumping. We have found that the spin-charge conversion efficiency θ_SHE of 0.034 in the SrRuO₃ sample is much larger than that of 0.0053 in the SrRu_0.7O₃ sample at 300 K, indicating that the Ru composition is essential for θ_SHE. These results suggest that the quality of SrRuO₃ plays a pivotal role in spintronics.