Properties of half-metallic double-perovskite thin films
説明
This paper reports the magnetic, and electrical properties of epitaxial thin films with an ordered double-perovskite structure. High-quality Sr/sub 2/FeMoO/sub 6/ (SFMO) and Sr/sub 2/CrReO/sub 6/ (SCRO) films have been grown by sputtering onto the completely lattice-matched substrates of Ba/sub 0.4/Sr/sub 0.6/TiO/sub 3/-buffered and bare SrTiO/sub 3/, respectively. These films exhibit high saturation magnetization M/sub s/ values (3.8 /spl mu//sub B//f.u. for SFMO and 0.9 /spl mu//sub B//f.u. for SCRO), which are close to the expected values for their half-metallicity, and high-T/sub c/ values (385 K for SFMO and 620 K for SCRO). The atomically flat surfaces free from any surface precipitate enable us to employ a standard photolithographic process for fabricating magnetic tunnel junctions based on these films. Magnetic tunnel junctions are completed with a native barrier formed by surface oxidation of a base-electrode film and a Co counterelectrode, showing 10% tunnel magnetoresistance (TMR) ratio at 4.2 K for a SFMO film.
収録刊行物
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- INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.
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INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005. 1883-1884, 2005-01-01
IEEE