Mesoraca S, Knudde S, Leitao D C, Cardoso S, Blamire M G
Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.
J Phys Condens Matter. 2018 Jan 10;30(1):015804. doi: 10.1088/1361-648X/aa9a9d.
Obtaining high efficiency spin filtering at room temperature using spinel ferromagnetic tunnel barriers has been hampered by the formation of antiphase boundaries due to their difference in lattice parameters between barrier and electrodes. In this work we demonstrate the use of LiTiO thin films as electrodes in an all-spinel oxide CoFeO-based spin filter devices. These structures show nearly perfect epitaxy maintained throughout the structure and so minimise the potential for APBs formation. The LiTiO in these devices is superconducting and so measurements at low temperature have been used to explore details of the tunnelling and Josephson junction behaviour.
由于尖晶石铁磁隧道势垒与电极之间的晶格参数差异导致反相边界的形成，在室温下使用尖晶石铁磁隧道势垒获得高效自旋过滤一直受到阻碍。在这项工作中，我们展示了在全尖晶石氧化物CoFeO基自旋过滤器件中使用LiTiO薄膜作为电极。这些结构在整个结构中显示出几乎完美的外延，因此将反相边界形成的可能性降至最低。这些器件中的LiTiO是超导的，因此已利用低温测量来探索隧穿和约瑟夫森结行为的细节。
