CONTROL OF THE RESONANCE FREQUENCY OF SOFT FERROMAGNETIC AMORPHOUS THIN-FILMS BY STRIP PATTERNING

Amorphous nearly zero-magnetostrictive soft ferromagnetic thin films w ith an in-plane uniaxial anisotropy exhibit a gyromagnetic resonance w ith frequency generally lower than 2 GHz. A convenient way to increase this frequency is to take the advantage of controlled demagnetizing e ffects: a periodic pattern of metal strips of width w, parallel to the easy axis, separated by a gap of width e is etched in the amorphous l ayer of thickness h. By playing with the geometrical parameters w, e, h, it is possible to adjust the resonance frequency. In this article, we demonstrate this principle for amorphous CoZrNb and CoFeMoMnSiB fil ms. (C) 1997 American Institute of Physics.