Determination of the iron atomic magnetic moments dynamics in the nanocrystalline ribbons Fe 90Zr 7B 3 by Mössbauer magnetic scans

Abstract

We have applied the transmission Mössbauer effect at a constant Doppler velocity technique, under 75 Oe external oscillating magnetic field in the frequency range 0–200 Hz, to determine the dynamics of the iron magnetic moments in nanocrystalline ribbons Fe 90Zr 7B 3. The experiment was performed at a fixed Doppler velocity coincident with an absorption line of the absorbent. Since the dependence of the absorption on the angle between the gamma ray directions and the magnetic field at the nuclear probe is known, the change in the orientation of the iron atomic magnetic moments with the external field can be inferred. Due to the fact that in this case the absorption lines from the nanocrystalline phase are resolved from the amorphous one, performing the experiment at distinct absorption lines, we were able to determine the dynamics of the atomic moments of each phase independently. These results are complemented with Mössbauer Spectroscopy.