Origin of the spin-asymmetry of hot-electron transmission in Fe

Banerjee, T. and Lodder, J.C. and Jansen, R. (2007) Origin of the spin-asymmetry of hot-electron transmission in Fe. Physical Review B: Condensed matter and materials physics, 76 (14). p. 140407. ISSN 1098-0121

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Abstract:	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.
Item Type:	Article
Copyright:	© 2007 American Physical Society
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Transducers Science and Technology (TST)
Link to this item:	http://purl.utwente.nl/publications/62207
Official URL:	http://dx.doi.org/10.1103/PhysRevB.76.140407
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