[5a-C18-1~12] 10.1 新物質・新機能創成（作製・評価技術）

▲ [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)

キーワード：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.