| 研究実績の概要 |
I investigated the structural and magneto-transport properties of a Fe/SrO/MgO/Fe magnetic tunnel junctions (MTJs), in which SrO is a highly lattice-mismatched tunnel barrier. I demonstrated that a fully epitaxial structure having a high magnetoresistance ratio of 98% at 20 K can be achieved despite the large lattice mismatch between the SrO and both the Fe top electrode and the MgO underlying layer. I also found that the resistance-area product (RA) and the physical constants related to tunneling are comparable to that of epitaxial Fe/MgO/Fe MTJs. These results suggest that SrO(001) is an effective tunnel barrier in which coherent spin-polarized tunneling takes place.
|
