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Keywords:

  • spintronics;
  • magnetic tunnel junctions;
  • oxide thin films;
  • magnetic coupling;
  • epitaxy
Thumbnail image of graphical abstract

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.