Spin-filter tunnel junction with matched Fermi surfaces
arXiv:1207.5372 · doi:10.1103/PhysRevLett.109.076602
Abstract
Efficient injection of spin-polarized current into a semiconductor is a basic prerequisite for building semiconductor-based spintronic devices. Here, we use inelastic electron tunneling spectroscopy to show that the efficiency of spin-filter-type spin injectors is limited by spin scattering of the tunneling electrons. By matching the Fermi-surface shapes of the current injection source and target electrode material, spin injection efficiency can be significantly increased in epitaxial ferromagnetic insulator tunnel junctions. Our results demonstrate that not only structural but also Fermi-surface matching is important to suppress scattering processes in spintronic devices.
5 pages, 4 figures
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- Heat transport and electron cooling in ballistic normal-metal/spin-filter/superconductor junctions
- Band edge noise spectroscopy of a magnetic tunnel junction