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The Laser-Mössbauer Method for Surface Evolution and Thin Film Microstructure

Published online by Cambridge University Press:  21 March 2011

Monica Sorescu
Monica Sorescu*
Affiliation:
Duquesne University, Physics Department, Bayer Center, Pittsburgh, PA 15282-0321, USA
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Abstract

Using amorphous Fe81B13.5Si3.5C2, Fe40Ni38Mo4B18, Fe66Co18B15Si1 and Fe72.6Cr22Al4.8Si0.3Y0.3 as model systems, we apply the laser-Mössbauer method in order to obtain metallic glasses with novel properties. As shown by transmission Mössbauer spectroscopy, the bulk magnetic texture was modified in a rational manner by applying a varying number of excimer laser pulses per spot (λ=248 nm, τ=8 ns). As shown by conversion electron Mössbauer spectroscopy, this process left the surface magnetic texture unchanged and induced a distribution of magnetic moment directions throughout the thickness of the foil. A similar dependence of the magnetic texture upon the number of applied laser pulses was obtained in metallic glasses irradiated with a Nd:YAG laser (λ=532 nm, τ=8 ns). However, in this case we observed the onset of surface crystallization in the hyperfine magnetic field distributions extracted from the CEMS spectra. When a pulsed alexandrite laser was used (λ=750 nm, τ=60 μs), the onset of crystallization was found to be accompanied by bulk oxidation and the formation of magnetite particles in the irradiated system. Finally, a crucial experiment was performed in order to demonstrate the role played by the magnetostriction constant in the onset of crystallization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 672: Symposium O – Mechanisms of Surface and Microstructure Evolution in Deposited Films and Film Structures , 2001 , O3.31
Copyright
Copyright © Materials Research Society 2001

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References

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