[11a-M101-1~11] CS.9 10.1 新物質・新機能創成（作製・評価技術）, 10.2 スピン基盤技術・萌芽的デバイス技術, 10.3 スピンデバイス・磁気メモリ・ストレージ技術,10.4 半導体スピントロニクス・超伝導・強相関のコードシェアセッション

▼ [11a-M101-7] Efficient spin-to-charge current conversion in a La_0.67Sr_0.33MnO₃/LaAlO₃/SrTiO₃ epitaxial single-crystal heterostructure

〇Daisei Araki¹、Anh Le Duc^1,2、Shingo Kaneta¹、Masaaki Tanaka^1,3、Ohya Shinobu^1,2,3 (1.Univ. Tokyo EEIS、2.Univ. Tokyo IEI、3.CSRN)

キーワード：spin orbit interaction, spin-to-charge conversion, spin pumping

The perovskite-oxide interface between LaAlO₃ (LAO) and SrTiO₃ (STO), both of which are insulators, is known to have a two-dimensional-electron gas (2DEG). The 2DEG has the strong Rashba spin-orbit interaction, which makes the LAO/STO interface attractive for efficient spin-to-charge conversion. We have used La_0.67Sr_0.33MnO₃ (LSMO) as a spin injection source, which is a half metallic ferromagnetic perovskite oxide that can be epitaxially grown on LAO and STO. Using ozone-assisted molecular-beam epitaxy, we have grown a high-quality all epitaxial LSMO (30 u.c.)/LAO (2 u.c.) heterostructure on a TiO₂-terminated STO (001) substrate. We successufully get the spin-to-charge conversion signal by spin pumping measurements. The spin-to-charge conversion efficiency (inverse Edelstein length) λ_IEE, which is defined as the generated current density (Am^–1) divided by the injected spin-current density (Am^–2), is estimated to be 4.0 nm at 20 K.