ABSTRACT
A double-barrier magnetic tunnel junction (DMTJ) is a spintronic
device composed of two or three ferromagnetic layers separated by
tunneling barriers (see Fig. 9.1). With two ferromagnetic layers, the
non-magnetic layer (normal or superconducting) could be located in
the middle (case a) or at the edge (case b) of the DMTJ. In the first
case one would expect sequential tunneling to occur with Coulomb
blockade (see further below) being negligible. The second case,
still to be investigated, would have spin injection controlled by the
relative magnetic alignment of the two electrodes in the MTJ, from
the ferromagnet to the normal metal or superconductor.
