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Article
Interface States in CoFe2O4 Spin-Filter Tunnel Junctions
Physical Review B (2013)
  • Pavel Lukashev, University of Northern Iowa
  • J. D. Burton, University of Nebraska - Lincoln
  • Alexander Smogunov
  • Julian P. Velev, University of Puerto Rico - San Juan
  • Evgeny Y. Tsymbal, University of Nebraska - Lincoln
Abstract
Spin-filter tunneling is a promising way to generate highly spin-polarized current, a key component for spintronics applications. In this paper we explore the tunneling conductance across the spin-filter material CoFe2O4 interfaced with Au electrodes, a geometry which provides nearly perfect lattice matching at the CoFe2O4/Au(001) interface. Using density functional theory calculations we demonstrate that interface states play a decisive role in controlling the transport spin polarization in this tunnel junction. For a realistic CoFe2O4 barrier thickness, we predict a tunneling spin polarization of about −60%. We show that this value is lower than what is expected based solely on considerations of the spin-polarized band structure of CoFe2O4, and therefore that these interface states can play a detrimental role. We argue that this is a rather general feature of ferrimagnetic ferrites and could make an important impact on spin-filter tunneling applications.
Disciplines
Publication Date
August 9, 2013
DOI
http://dx.doi.org/10.1103/PhysRevB.88.134430
Citation Information
Pavel Lukashev, J. D. Burton, Alexander Smogunov, Julian P. Velev, et al.. "Interface States in CoFe2O4 Spin-Filter Tunnel Junctions" Physical Review B Vol. 88 Iss. 13 (2013)
Available at: http://works.bepress.com/pavel-lukashev/2/