Advanced Functional Materials

Cover image for Vol. 26 Issue 36

22_21b/2012Spintronics: Large Tunnel Magnetoresistance in Epitaxial Oxide Spin-Filter Tunnel Junctions (Adv. Funct. Mater. 21/2012)

A spin-polarized-current generator is a fundamental device in spintronics. As reported on page 4471, Isao Ohkubo and co-workers have developed a highperformance spin-filter tunnel junction by growing an atomic-layer-controlled oxide multilayer. In this device, up-spin electrons can selectively tunnel through a nanometer-thick ferromagnetic insulator, while down-spin electrons are reflected. The image shows a false-colored cross-sectional transmission electron microscope image of the device.

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