Observation of thickness dependence of magnetic surface anisotropy in ultrathin amorphous films.
Physical Review Letters
American Physical Society
Ferromagnetic resonance (FMR) and SQUID magnetometry measurements have been made on multilayers of amorphous Fe70B30/Ag. The dependence of the magnetic surface anisotropy constant Ks on the magnetic layer thickness 2L has been determined in the range 1.6 Å<2L<90 Å using more than twenty samples. It is found that Ks is constant for 2L>16.5 Å, but decreases monotonically towards zero as 2L decreases from 16.5 Å towards zero. The FMR results can be well described by a theory developed for ultrathin amorphous ferromagnetic layers.
Copyright © 1990 The American Physical Society
Vol. 64 (15), pp. 1820 - 1823