Using the technique of ballistic electron magnetic microscopy, we have studied the spin-asymmetry of transmission of hot electrons in Fe, for which a recent ab initio calculation has shown that the inelastic lifetime is similar for majority and minority spin. Nevertheless, using a spin-valve structure of Ni81Fe19/Au/ Fe, we find that the attenuation length of hot electrons in Fe at 1.2–1.6 eV is a factor of 4 larger for the majority spin. We argue that this large spin-asymmetry arises from the spin dependence of the group velocity, rather than the lifetime.
|Number of pages||4|
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 24 Oct 2007|
Banerjee, T., Lodder, J. C., & Jansen, R. (2007). Origin of the spin-asymmetry of hot-electron transmission in Fe. Physical review B: Condensed matter and materials physics, 76(5/october), 140407. [10.1103/PhysRevB.76.140407]. https://doi.org/10.1103/PhysRevB.76.140407