[5a-C18-1~12] 10.1 Emerging materials in spintronics and magnetics (including fabrication and charactrization methodologies)

▲ [5a-C18-4] Observation of antiparallel Ru-Ir spins in SrRuO₃-SrIrO₃ heterointerface

〇Yuki Ohuchi¹, Jobu Matsuno^2,3, Motohiro Suzuki⁴, Takashi Koretsune^3,5, Ryotaro Arita², Yusuke Kozuka¹, Masaki Uchida¹, Taka-hisa Arima^2,6, Yoshinori Tokura^1,2, Masashi Kawasaki^1,2 (1.Dept. of Appl. Phys., the Univ. of Tokyo, 2.RIKEN CEMS, 3.JST PRESTO, 4.JASRI, 5.Dept. of Physics, Tohoku Univ., 6.Dept. Adv. Mater. Sci., the Univ. of Tokyo)

Keywords:proximity induced magnetization, iridium oxides, heterostructures

We investigate magnetic proximity effect in SrIrO₃ neighboring SrRuO₃ by x-ray magnetic circular dichroism (XMCD) at SPring-8 BL39XU. We prepared the epitaxial superlattice of SrRuO₃ (5 unit cells) and SrIrO₃ (3 unit cells) on a SrTiO₃ substrate by pulsed laser deposition method. XMCD signals at the Ir L₃ and L₂ edges are observed at 25 K. The induced magnetization is as small as 0.02 μ_B/Ir, which is antiparallel to the magnetization of SrRuO₃. We clarified the large proportion of the orbital magnetic moment in Ir (0.01 μ_B/Ir), suggesting the importance of spin orbit coupling in the proximity induced magnetization.