Abstract
Quantum well (QW) resonances in double barrier magnetic tunnel junctions are calculated from first principles. By including the Coulomb blockade energy due to the finite size islands of the middle Fe film, we confirm that the oscillatory differential resistance observed in a recent experiment [T. Nozaki et al., Phys. Rev. Lett. 96, 027208 (2006)] originates from the QW resonances from the band of the Fe majority-spin channel. The primary source of smearing at low temperatures is shown to be the variation of the Coulomb blockade energy.
- Received 13 June 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.087210
©2006 American Physical Society