The air-oxidized magnetic tunnel junction structures grown by molecular beam epitaxy (MBE) were studied. The thermal stability of the trilayer structures was analyzed using x-ray photoelectron spectroscopy (XPS) and in situ scanning tunneling microscopy (STM). No oxidation of the bottom magnetic layer was shown in the unannealed trilayers for barriers thicker than 1.1 nm. The results upon annealing show that the metallic XPS peak of the top layers decrease dramatically, while that of the bottom and barrier layers increases.
ASJC Scopus subject areas
- Physics and Astronomy(all)