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Paper   IPM / Nano-Sciences / 12426
School of Nano Science
  Title:   Parasitic capacitance of FeCo/MgO/FeCo magnetic tunnel junctions
1.  B. Abedi Ravan
2.  Ali Asghar Shokri
  Status:   Published
  Journal: Physica E
  No.:  7-8
  Vol.:  44
  Year:  2012
  Pages:   5
  Publisher(s):   Elsevier B.V.
  Supported by:  IPM
In this work, we report a theoretical investigation of parasitic capacitance in FeCo/MgO/FeCo magnetic tunnel junctions (MTJs). The electronic structures needed for accomplishment of this work arecomputed within the density functional theory using the full-potential linearized augmented planewave method (FLAPW) as implemented in Wien2k. Fixed-spin-moment (FSM) calculations are used to simulate the interfacial effects on the electronic structure of the electrodes. It is discussed that the charge screening at surfaces of the electrodes alters their local electric permittivities. The relative electric permittivities of the electrodes are calculated and their effects on the overall capacitance of the MTJ are estimated. Finally, capacitive properties of the MTJ are investigated and it is resulted that its capacitance, especially for the Co-ending electrodes, is not considerably dependent on an externally applied magnetic field

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