Evidence for "loose spins" in epitaxial Al/Fe/Al
Polarization-dependent Fe K-edge x-ray absorption fine structure measurements of an Al/Fe/Al(001) trilayer reveal a small tetragonal distortion of the Fe sites with c = 2.863 Å (normal to the film plane) and a = 2.874 Å (in the film plane). This tetragonal distortion is consistent with the formation of Fe1-xAlx alloys in the vicinity of the roughened Fe-Al trilayer interfaces, and agrees with grazing incidence x-ray reflectivity and magnetometry measurements of the trilayer. The deduced alloyed/roughened interfacial regions are the likely source of Fe "loose spins" as recently suggested by Slonczewki's biquadratic coupling model for the epitaxial Fe/Al/Fe system.
Physics, Astronomy, and Materials Science
Gutierrez, C. J., R. Selestino, Robert A. Mayanovic, and G. A. Prinz. "Evidence for “loose spins” in epitaxial Al/Fe/Al." Journal of applied physics 81, no. 8 (1997): 5352-5354.
Journal of Applied Physics